├── .github └── workflows │ └── build.yml ├── .gitignore ├── README.md ├── arduino-cli.yaml ├── art ├── BLELibrary.PNG ├── MyCadence.png └── cadence.png ├── device.h ├── icons.h ├── icons ├── README.md ├── cadence.png ├── clock.png └── mountain.png ├── mycadence-arduino.ino └── power.h /.github/workflows/build.yml: -------------------------------------------------------------------------------- 1 | name: Build Heltec WiFi Kit 32 2 | 3 | on: [push, pull_request] 4 | 5 | jobs: 6 | build: 7 | runs-on: ubuntu-latest 8 | 9 | steps: 10 | - uses: actions/checkout@v1 11 | - name: Install Arduino CLI 12 | uses: arduino/setup-arduino-cli@v1.1.1 13 | - name: Install Python 14 | uses: actions/setup-python@v2 15 | with: 16 | python-version: '3.x' 17 | - name: Install ESP32 tools 18 | run: | 19 | pip install esptool 20 | - name: Install CLI dependencies 21 | run: | 22 | arduino-cli core update-index 23 | arduino-cli core install Heltec-esp32:esp32 24 | arduino-cli lib update-index 25 | arduino-cli lib install "Heltec ESP32 Dev-Boards" 26 | arduino-cli lib install "ESP32 BLE Arduino" 27 | - name: Build 28 | run: | 29 | arduino-cli compile --fqbn Heltec-esp32:esp32:wifi_kit_32 --export-binaries mycadence-arduino 30 | - name: Upload artifacts 31 | uses: actions/upload-artifact@v2 32 | with: 33 | name: Heltec WiFi Kit 32 34 | path: build/Heltec-esp32.esp32.wifi_kit_32/ 35 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | ## Ignore Visual Studio temporary files, build results, and 2 | ## files generated by popular Visual Studio add-ons. 3 | ## 4 | ## Get latest from https://github.com/github/gitignore/blob/master/VisualStudio.gitignore 5 | 6 | # User-specific files 7 | *.rsuser 8 | *.suo 9 | *.user 10 | *.userosscache 11 | *.sln.docstates 12 | 13 | # User-specific files (MonoDevelop/Xamarin Studio) 14 | *.userprefs 15 | 16 | # Mono auto generated files 17 | mono_crash.* 18 | 19 | # Build results 20 | [Dd]ebug/ 21 | [Dd]ebugPublic/ 22 | [Rr]elease/ 23 | [Rr]eleases/ 24 | x64/ 25 | x86/ 26 | [Aa][Rr][Mm]/ 27 | [Aa][Rr][Mm]64/ 28 | bld/ 29 | [Bb]in/ 30 | [Oo]bj/ 31 | [Ll]og/ 32 | [Ll]ogs/ 33 | 34 | # Visual Studio 2015/2017 cache/options directory 35 | .vs/ 36 | # Uncomment if you have tasks that create the project's static files in wwwroot 37 | #wwwroot/ 38 | 39 | # Visual Studio 2017 auto generated files 40 | Generated\ Files/ 41 | 42 | # MSTest test Results 43 | [Tt]est[Rr]esult*/ 44 | [Bb]uild[Ll]og.* 45 | 46 | # NUnit 47 | *.VisualState.xml 48 | TestResult.xml 49 | nunit-*.xml 50 | 51 | # Build Results of an ATL Project 52 | [Dd]ebugPS/ 53 | [Rr]eleasePS/ 54 | dlldata.c 55 | 56 | # Benchmark Results 57 | BenchmarkDotNet.Artifacts/ 58 | 59 | # .NET Core 60 | project.lock.json 61 | project.fragment.lock.json 62 | artifacts/ 63 | 64 | # StyleCop 65 | StyleCopReport.xml 66 | 67 | # Files built by Visual Studio 68 | *_i.c 69 | *_p.c 70 | *_h.h 71 | *.ilk 72 | *.meta 73 | *.obj 74 | *.iobj 75 | *.pch 76 | *.pdb 77 | *.ipdb 78 | *.pgc 79 | *.pgd 80 | *.rsp 81 | *.sbr 82 | *.tlb 83 | *.tli 84 | *.tlh 85 | *.tmp 86 | *.tmp_proj 87 | *_wpftmp.csproj 88 | *.log 89 | *.vspscc 90 | *.vssscc 91 | .builds 92 | *.pidb 93 | *.svclog 94 | *.scc 95 | 96 | # Chutzpah Test files 97 | _Chutzpah* 98 | 99 | # Visual C++ cache files 100 | ipch/ 101 | *.aps 102 | *.ncb 103 | *.opendb 104 | *.opensdf 105 | *.sdf 106 | *.cachefile 107 | *.VC.db 108 | *.VC.VC.opendb 109 | 110 | # Visual Studio profiler 111 | *.psess 112 | *.vsp 113 | *.vspx 114 | *.sap 115 | 116 | # Visual Studio Trace Files 117 | *.e2e 118 | 119 | # TFS 2012 Local Workspace 120 | $tf/ 121 | 122 | # Guidance Automation Toolkit 123 | *.gpState 124 | 125 | # ReSharper is a .NET coding add-in 126 | _ReSharper*/ 127 | *.[Rr]e[Ss]harper 128 | *.DotSettings.user 129 | 130 | # TeamCity is a build add-in 131 | _TeamCity* 132 | 133 | # DotCover is a Code Coverage Tool 134 | *.dotCover 135 | 136 | # AxoCover is a Code Coverage Tool 137 | .axoCover/* 138 | !.axoCover/settings.json 139 | 140 | # Visual Studio code coverage results 141 | *.coverage 142 | *.coveragexml 143 | 144 | # NCrunch 145 | _NCrunch_* 146 | .*crunch*.local.xml 147 | nCrunchTemp_* 148 | 149 | # MightyMoose 150 | *.mm.* 151 | AutoTest.Net/ 152 | 153 | # Web workbench (sass) 154 | .sass-cache/ 155 | 156 | # Installshield output folder 157 | [Ee]xpress/ 158 | 159 | # DocProject is a documentation generator add-in 160 | DocProject/buildhelp/ 161 | DocProject/Help/*.HxT 162 | DocProject/Help/*.HxC 163 | DocProject/Help/*.hhc 164 | DocProject/Help/*.hhk 165 | DocProject/Help/*.hhp 166 | DocProject/Help/Html2 167 | DocProject/Help/html 168 | 169 | # Click-Once directory 170 | publish/ 171 | 172 | # Publish Web Output 173 | *.[Pp]ublish.xml 174 | *.azurePubxml 175 | # Note: Comment the next line if you want to checkin your web deploy settings, 176 | # but database connection strings (with potential passwords) will be unencrypted 177 | *.pubxml 178 | *.publishproj 179 | 180 | # Microsoft Azure Web App publish settings. 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Backup files are not needed, 246 | # because we have git ;-) 247 | _UpgradeReport_Files/ 248 | Backup*/ 249 | UpgradeLog*.XML 250 | UpgradeLog*.htm 251 | ServiceFabricBackup/ 252 | *.rptproj.bak 253 | 254 | # SQL Server files 255 | *.mdf 256 | *.ldf 257 | *.ndf 258 | 259 | # Business Intelligence projects 260 | *.rdl.data 261 | *.bim.layout 262 | *.bim_*.settings 263 | *.rptproj.rsuser 264 | *- [Bb]ackup.rdl 265 | *- [Bb]ackup ([0-9]).rdl 266 | *- [Bb]ackup ([0-9][0-9]).rdl 267 | 268 | # Microsoft Fakes 269 | FakesAssemblies/ 270 | 271 | # GhostDoc plugin setting file 272 | *.GhostDoc.xml 273 | 274 | # Node.js Tools for Visual Studio 275 | .ntvs_analysis.dat 276 | node_modules/ 277 | 278 | # Visual Studio 6 build log 279 | *.plg 280 | 281 | # Visual Studio 6 workspace options file 282 | *.opt 283 | 284 | # Visual Studio 6 auto-generated workspace file (contains which files were open etc.) 285 | *.vbw 286 | 287 | # Visual Studio LightSwitch build output 288 | **/*.HTMLClient/GeneratedArtifacts 289 | **/*.DesktopClient/GeneratedArtifacts 290 | **/*.DesktopClient/ModelManifest.xml 291 | **/*.Server/GeneratedArtifacts 292 | **/*.Server/ModelManifest.xml 293 | _Pvt_Extensions 294 | 295 | # Paket dependency manager 296 | .paket/paket.exe 297 | paket-files/ 298 | 299 | # FAKE - F# Make 300 | .fake/ 301 | 302 | # CodeRush personal settings 303 | .cr/personal 304 | 305 | # Python Tools for Visual Studio (PTVS) 306 | __pycache__/ 307 | *.pyc 308 | 309 | # Cake - Uncomment if you are using it 310 | # tools/** 311 | # !tools/packages.config 312 | 313 | # Tabs Studio 314 | *.tss 315 | 316 | # Telerik's JustMock configuration file 317 | *.jmconfig 318 | 319 | # BizTalk build output 320 | *.btp.cs 321 | *.btm.cs 322 | *.odx.cs 323 | *.xsd.cs 324 | 325 | # OpenCover UI analysis results 326 | OpenCover/ 327 | 328 | # Azure Stream Analytics local run output 329 | ASALocalRun/ 330 | 331 | # MSBuild Binary and Structured Log 332 | *.binlog 333 | 334 | # NVidia Nsight GPU debugger configuration file 335 | *.nvuser 336 | 337 | # MFractors (Xamarin productivity tool) working folder 338 | .mfractor/ 339 | 340 | # Local History for Visual Studio 341 | .localhistory/ 342 | 343 | # BeatPulse healthcheck temp database 344 | healthchecksdb 345 | 346 | # Backup folder for Package Reference Convert tool in Visual Studio 2017 347 | MigrationBackup/ 348 | 349 | # Ionide (cross platform F# VS Code tools) working folder 350 | .ionide/ 351 | 352 | # ESP32 build folder 353 | build/ 354 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # My Cadence for Arduino 2 | 3 | This is an open source project to connect to popular cadence sensors for indoor cycling and display the current cadence in realtime. Looking for a free cadence display for iOS & Android? Checkout [My Cadence for iOS & Android](https://mycadence.app). 4 | 5 | Inspired & code forked from https://github.com/snowzach/echbt, which is an awesome way of dislaying data from an Echelon bike. 6 | 7 | ![](art/cadence.png) 8 | 9 | * Build Status: ![Build Heltec WiFi Kit 32](https://github.com/jamesmontemagno/mycadence-arduino/workflows/Build%20Heltec%20WiFi%20Kit%2032/badge.svg) 10 | 11 | ## Hardware Required 12 | 13 | * [MakerFocus ESP32](https://amzn.to/2LAmqt4) 14 | * [ESP32 Batteries(optional)](https://amzn.to/2KGfJWA) 15 | * [USB Micro Cable](https://amzn.to/2KSxstH) 16 | 17 | ## Compatible Sensors 18 | * [Moofit Cadence](https://amzn.to/349DpZM) 19 | * [Wahoo](https://amzn.to/3h2Lyo1) 20 | * [Magene](https://amzn.to/3raJ0Jd) 21 | * [Garmin](https://amzn.to/2WtSgdl) 22 | * Other cadence sensors that broadcast Speed & Cadence specification 23 | 24 | ### 3D Printable Case 25 | This is a really nice case that you can print from thingiverse. 26 | * [caseESP32_OLED on Thingiverse](https://www.thingiverse.com/thing:2670713) 27 | 28 | ## Setup 29 | 30 | 1. Install [Arduino Studio](https://www.arduino.cc/en/software) 31 | 2. Open .ino in Arduino Studio 32 | 3. Add ESP32 Device - [Follow these steps](https://heltec-automation-docs.readthedocs.io/en/latest/esp32/quick_start.html) 33 | 4. Select Wifi 32 from Tools -> Board -> Heltec 34 | 5. Add ESP32 Library - [Follow these steps](https://github.com/HelTecAutomation/Heltec_ESP32) 35 | 6. Add ESP32 BLE Arduino Library - https://github.com/nkolban/ESP32_BLE_Arduino 36 | 7. Deploy to device! 37 | 38 | The app will automatically scan for cadence sensors for 10 seconds. If it finds a single sensor it will automatically connect and start reporting data! If there are multiple sensors detected you can pick on from the list. 39 | 40 | ## Get My Cadence for iOS & Android 41 | 42 | Looking for an app for your phone or tablet to display the cadence? Checkout [My Cadence](https://mycadence.app), a simple display for your cadence sensor when you are indoor cycling. Simply connect to your cadence sensor via Bluetooth and my cadence will update your cadence in realtime with a simple to read display. 43 | 44 | ![art](art/MyCadence.png) 45 | 46 | ## License information 47 | 48 | LICENSE: Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. 49 | -------------------------------------------------------------------------------- /arduino-cli.yaml: -------------------------------------------------------------------------------- 1 | # arduino-cli.yaml 2 | board_manager: 3 | additional_urls: 4 | - https://resource.heltec.cn/download/package_heltec_esp32_index.json -------------------------------------------------------------------------------- /art/BLELibrary.PNG: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/jamesmontemagno/mycadence-arduino/7b84538374d3e4329700fc49541df3da42e8f5cd/art/BLELibrary.PNG -------------------------------------------------------------------------------- /art/MyCadence.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/jamesmontemagno/mycadence-arduino/7b84538374d3e4329700fc49541df3da42e8f5cd/art/MyCadence.png -------------------------------------------------------------------------------- /art/cadence.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/jamesmontemagno/mycadence-arduino/7b84538374d3e4329700fc49541df3da42e8f5cd/art/cadence.png -------------------------------------------------------------------------------- /device.h: -------------------------------------------------------------------------------- 1 | //This is standard speed & cadence bluetooth UUID 2 | static BLEUUID serviceUUID("00001816-0000-1000-8000-00805f9b34fb"); 3 | // This is the standard notify characteristic UUID 4 | static BLEUUID notifyUUID("00002a5b-0000-1000-8000-00805f9b34fb"); 5 | 6 | static BLEAdvertisedDevice * devices[20]; 7 | static int device_count = 0; 8 | 9 | // button handling 10 | #define BUTTON_DEBOUNCE_TIME 50 11 | #define BUTTON_SHORT_PRESS_TIME 400 12 | 13 | // Add a device to our device list (deduplicate in the process) 14 | void addDevice(BLEAdvertisedDevice * device) { 15 | for (uint8_t i = 0; i < device_count; i++) { 16 | if(device->getName() == devices[i]->getName()){ 17 | return; 18 | } 19 | } 20 | if(!device->haveServiceUUID() || !device->isAdvertisingService(serviceUUID)) { 21 | return; 22 | } 23 | devices[device_count] = device; 24 | device_count++; 25 | } 26 | 27 | // Select a device and return it 28 | BLEAdvertisedDevice * selectDevice(void) { 29 | Heltec.display->setFont(ArialMT_Plain_10); 30 | 31 | if(device_count == 0) return nullptr; 32 | if(device_count == 1) return devices[0]; 33 | 34 | int selected = 0; 35 | 36 | // Select a device 37 | while(true) { 38 | if(selected > device_count-1) selected = 0; 39 | int start = selected < 2 ? 0 : selected - 1; 40 | 41 | Heltec.display->clear(); 42 | Heltec.display->setLogBuffer(10, 50); 43 | // Print to the screen 44 | for (int i = start; i < device_count; i++) { 45 | if(i == selected) { 46 | Heltec.display->print("->"); 47 | } else { 48 | Heltec.display->print(" "); 49 | } 50 | Heltec.display->println(devices[i]->getName().c_str()); 51 | } 52 | Heltec.display->drawLogBuffer(0, 0); 53 | Heltec.display->display(); 54 | 55 | int lastState = LOW; // the previous state from the input pin 56 | int currentState; // the current reading from the input pin 57 | unsigned long pressedTime = 0; 58 | 59 | while(true) { 60 | // read the state of the switch/button: 61 | currentState = digitalRead(KEY_BUILTIN); 62 | if(lastState == HIGH && currentState == LOW) { // button is pressed 63 | pressedTime = millis(); 64 | Serial.println("DOWN"); 65 | } else if(pressedTime != 0 && lastState == LOW && currentState == HIGH) { // button is released 66 | long pressDuration = millis() - pressedTime; 67 | Serial.println("UP"); 68 | if(pressDuration < BUTTON_DEBOUNCE_TIME) { 69 | pressedTime = 0; 70 | } else if(pressDuration < BUTTON_SHORT_PRESS_TIME ) { 71 | Serial.println("A short press is detected"); 72 | pressedTime = 0; 73 | selected++; 74 | break; 75 | } else { 76 | Serial.println("A long press is detected"); 77 | pressedTime = 0; 78 | return devices[selected]; 79 | break; 80 | } 81 | } 82 | 83 | 84 | // save the the last state 85 | lastState = currentState; 86 | } 87 | } 88 | return nullptr; 89 | } 90 | -------------------------------------------------------------------------------- /icons.h: -------------------------------------------------------------------------------- 1 | // convert clock.png clock.mono 2 | // xxd -i clock.mono 3 | 4 | const unsigned char clock_icon[] PROGMEM = { 5 | 0xc0, 0x3f, 0x00, 0xf0, 0xff, 0x00, 0x78, 0xe0, 0x01, 0x1c, 0x80, 0x03, 6 | 0x0e, 0x06, 0x07, 0x06, 0x06, 0x06, 0x07, 0x06, 0x0e, 0x03, 0x06, 0x0c, 7 | 0x03, 0x06, 0x0c, 0x03, 0x06, 0x0c, 0x03, 0x0e, 0x0c, 0x03, 0x1c, 0x0c, 8 | 0x03, 0x38, 0x0c, 0x07, 0x30, 0x0e, 0x06, 0x00, 0x06, 0x0e, 0x00, 0x07, 9 | 0x1c, 0x80, 0x03, 0x78, 0xe0, 0x01, 0xf0, 0xff, 0x00, 0xc0, 0x3f, 0x00 10 | }; 11 | #define clock_icon_width 20 12 | #define clock_icon_height 20 13 | 14 | 15 | const unsigned char cadence_icon[] PROGMEM = { 16 | 0x00, 0x00, 0x0f, 0xc0, 0x9f, 0x09, 0xe0, 0xff, 0x08, 0x70, 0x70, 0x0c, 17 | 0x38, 0x30, 0x06, 0x18, 0x18, 0x03, 0x0c, 0x8c, 0x03, 0x0e, 0xc6, 0x07, 18 | 0x06, 0x63, 0x06, 0x06, 0x33, 0x06, 0x06, 0x1f, 0x06, 0x0e, 0x0e, 0x07, 19 | 0x0c, 0x00, 0x03, 0x1c, 0x80, 0x01, 0x3c, 0xc0, 0x01, 0x7e, 0xe0, 0x00, 20 | 0xf3, 0x7f, 0x00, 0xf1, 0x3f, 0x00, 0x19, 0x00, 0x00, 0x0f, 0x00, 0x00 21 | }; 22 | #define cadence_icon_width 20 23 | #define cadence_icon_height 20 24 | 25 | unsigned char mountain_icon[] = { 26 | 0x00, 0x00, 0x00, 0xff, 0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe0, 0xff, 27 | 0xff, 0x03, 0x00, 0x00, 0x00, 0x00, 0xfc, 0xff, 0xff, 0x1f, 0x00, 0x00, 28 | 0x00, 0x00, 0xff, 0x03, 0xe0, 0x7f, 0x00, 0x00, 0x00, 0x80, 0x3f, 0x00, 29 | 0x00, 0xfe, 0x01, 0x00, 0x00, 0xe0, 0x0f, 0x00, 0x00, 0xf8, 0x03, 0x00, 30 | 0x00, 0xf0, 0x03, 0x00, 0x00, 0xe0, 0x07, 0x00, 0x00, 0xf8, 0x00, 0x00, 31 | 0x00, 0x80, 0x1f, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x00, 0x00, 0x3f, 0x00, 32 | 0x00, 0x1f, 0x00, 0x00, 0x00, 0x00, 0x7c, 0x00, 0x00, 0x0f, 0x00, 0x00, 33 | 0x00, 0x00, 0xf8, 0x00, 0x80, 0x07, 0x60, 0x00, 0x00, 0x00, 0xf0, 0x00, 34 | 0xc0, 0x03, 0x60, 0x00, 0x00, 0x0e, 0xe0, 0x01, 0xe0, 0x01, 0x60, 0x00, 35 | 0x00, 0x0e, 0xc0, 0x03, 0xe0, 0x01, 0x00, 0x00, 0x00, 0x04, 0xc0, 0x07, 36 | 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x07, 0x78, 0x00, 0x00, 0x80, 37 | 0x01, 0x00, 0x00, 0x0f, 0x78, 0x00, 0x00, 0x80, 0x01, 0x00, 0x00, 0x0f, 38 | 0x3c, 0x00, 0x00, 0x80, 0x01, 0x00, 0x00, 0x1e, 0x3c, 0x00, 0x00, 0x00, 39 | 0x00, 0x00, 0x00, 0x1e, 0x1c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3c, 40 | 0x1e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3c, 0x0e, 0x00, 0x00, 0x00, 41 | 0x00, 0x00, 0x00, 0x38, 0x0e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x38, 42 | 0x0f, 0x80, 0x03, 0x80, 0x01, 0x00, 0x00, 0x78, 0x0f, 0x80, 0x03, 0xc0, 43 | 0x03, 0x1c, 0x00, 0x70, 0x07, 0x00, 0x01, 0xe0, 0x07, 0x1c, 0x00, 0x70, 44 | 0x07, 0x00, 0x00, 0xf0, 0x0f, 0x00, 0x00, 0x70, 0x07, 0x00, 0x00, 0x78, 45 | 0x1e, 0x00, 0x00, 0x70, 0x07, 0x00, 0x00, 0x3c, 0x3c, 0x00, 0x00, 0xf0, 46 | 0x07, 0x00, 0x00, 0x1e, 0x78, 0x00, 0x00, 0xf0, 0x07, 0x00, 0x00, 0x0f, 47 | 0xf0, 0x00, 0x00, 0xf0, 0x07, 0x00, 0x80, 0x07, 0xe0, 0x01, 0x00, 0xf0, 48 | 0x07, 0x00, 0xc0, 0x03, 0xc0, 0x03, 0x00, 0xf0, 0x07, 0x07, 0xe0, 0x01, 49 | 0x80, 0x07, 0x70, 0x70, 0x87, 0x0f, 0xf0, 0xc0, 0x03, 0x0f, 0xf8, 0x70, 50 | 0xc7, 0x1f, 0xf8, 0xe0, 0x07, 0x1e, 0xfc, 0x71, 0xef, 0x3f, 0xfc, 0xf1, 51 | 0x0f, 0x3f, 0xfe, 0x73, 0xff, 0x7d, 0xfe, 0xfb, 0x9f, 0x7f, 0xdf, 0x7f, 52 | 0xfe, 0xf8, 0xcf, 0x7f, 0xfe, 0xf3, 0x8f, 0x7f, 0x7e, 0xf0, 0x87, 0x3f, 53 | 0xfc, 0xe1, 0x07, 0x3f, 0x3e, 0xe0, 0x03, 0x1f, 0xf8, 0xc0, 0x03, 0x3e, 54 | 0x1c, 0xe0, 0x01, 0x0e, 0x70, 0x80, 0x07, 0x3c, 0x3c, 0xf0, 0x00, 0x04, 55 | 0x00, 0x00, 0x0f, 0x1c, 0x3c, 0x78, 0x00, 0x00, 0x00, 0x00, 0x1e, 0x1e, 56 | 0x78, 0x3c, 0x00, 0x00, 0x00, 0x00, 0x3c, 0x0f, 0x78, 0x1e, 0x00, 0x00, 57 | 0x00, 0x00, 0x78, 0x0f, 0xf0, 0x0f, 0x00, 0x00, 0x00, 0x00, 0xf0, 0x07, 58 | 0xf0, 0x07, 0x00, 0x00, 0x00, 0x00, 0xe0, 0x07, 0xe0, 0x03, 0x00, 0x00, 59 | 0x00, 0x00, 0xc0, 0x03, 0xc0, 0x03, 0x00, 0x00, 0x00, 0x00, 0xe0, 0x01, 60 | 0x80, 0x07, 0x00, 0x00, 0x00, 0x00, 0xf0, 0x01, 0x80, 0x0f, 0x00, 0x00, 61 | 0x00, 0x00, 0xf8, 0x00, 0x00, 0x1f, 0x00, 0x00, 0x00, 0x00, 0x7c, 0x00, 62 | 0x00, 0x7e, 0x00, 0x00, 0x00, 0x00, 0x3e, 0x00, 0x00, 0xfc, 0x00, 0x00, 63 | 0x00, 0x80, 0x1f, 0x00, 0x00, 0xf0, 0x03, 0x00, 0x00, 0xe0, 0x0f, 0x00, 64 | 0x00, 0xe0, 0x0f, 0x00, 0x00, 0xf0, 0x03, 0x00, 0x00, 0xc0, 0x3f, 0x00, 65 | 0x00, 0xfe, 0x01, 0x00, 0x00, 0x00, 0xff, 0x01, 0xc0, 0x7f, 0x00, 0x00, 66 | 0x00, 0x00, 0xfc, 0xff, 0xff, 0x1f, 0x00, 0x00, 0x00, 0x00, 0xf0, 0xff, 67 | 0xff, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0x00, 68 | 0x00, 0x00, 0x00, 0xe0, 0x03, 0x00, 0x00, 0x00 69 | }; 70 | #define mountain_icon_width 64 71 | #define mountain_icon_height 64 72 | -------------------------------------------------------------------------------- /icons/README.md: -------------------------------------------------------------------------------- 1 | To convert to OLED format 2 | ``` 3 | convery clock.png clock.mono 4 | xxd -i clock.mono 5 | ``` 6 | 7 | -------------------------------------------------------------------------------- /icons/cadence.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/jamesmontemagno/mycadence-arduino/7b84538374d3e4329700fc49541df3da42e8f5cd/icons/cadence.png -------------------------------------------------------------------------------- /icons/clock.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/jamesmontemagno/mycadence-arduino/7b84538374d3e4329700fc49541df3da42e8f5cd/icons/clock.png -------------------------------------------------------------------------------- /icons/mountain.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/jamesmontemagno/mycadence-arduino/7b84538374d3e4329700fc49541df3da42e8f5cd/icons/mountain.png -------------------------------------------------------------------------------- /mycadence-arduino.ino: -------------------------------------------------------------------------------- 1 | #include "Arduino.h" 2 | #include "heltec.h" 3 | #include "BLEDevice.h" 4 | #include "icons.h" 5 | #include "device.h" 6 | #include "power.h" 7 | 8 | static boolean connected = false; 9 | 10 | static BLERemoteCharacteristic* sensorCharacteristic; 11 | static BLEAdvertisedDevice* device; 12 | static BLEClient* client; 13 | static BLEScan* scanner; 14 | 15 | static int cadence = 0; 16 | static unsigned long runtime = 0; 17 | static unsigned long last_millis = 0; 18 | 19 | static int prevCumulativeCrankRev = 0; 20 | static int prevCrankTime = 0; 21 | static double rpm = 0; 22 | static double prevRPM = 0; 23 | static int prevCrankStaleness = 0; 24 | static int stalenessLimit = 4; 25 | static int scanCount = 0; 26 | 27 | #define debug 0 28 | #define maxCadence 120 29 | 30 | 31 | 32 | static bool is_bit_set(unsigned value, unsigned bitindex) 33 | { 34 | return (value & (1 << bitindex)) != 0; 35 | } 36 | 37 | // Called when device sends update notification 38 | static void notifyCallback(BLERemoteCharacteristic* pBLERemoteCharacteristic, uint8_t* data, size_t length, bool isNotify) { 39 | 40 | 41 | bool hasWheel = is_bit_set(data[0], 0); 42 | bool hasCrank = is_bit_set(data[0], 1); 43 | 44 | int crankRevIndex = 1; 45 | int crankTimeIndex = 3; 46 | if(hasWheel) 47 | { 48 | crankRevIndex = 7; 49 | crankTimeIndex = 9; 50 | } 51 | 52 | int cumulativeCrankRev = int((data[crankRevIndex + 1] << 8) + data[crankRevIndex]); 53 | int lastCrankTime = int((data[crankTimeIndex + 1] << 8) + data[crankTimeIndex]); 54 | 55 | if(debug) 56 | { 57 | Serial.println("Notify callback for characteristic"); 58 | Serial.print("cumulativeCrankRev: "); 59 | Serial.println(cumulativeCrankRev); 60 | Serial.print("lastCrankTime: "); 61 | Serial.println(lastCrankTime); 62 | } 63 | 64 | int deltaRotations = cumulativeCrankRev - prevCumulativeCrankRev; 65 | if (deltaRotations < 0) 66 | { 67 | deltaRotations += 65535; 68 | } 69 | 70 | int timeDelta = lastCrankTime - prevCrankTime; 71 | if (timeDelta < 0) 72 | { 73 | timeDelta += 65535; 74 | } 75 | 76 | if(debug) 77 | { 78 | Serial.print("deltaRotations: "); 79 | Serial.println(deltaRotations); 80 | Serial.print("timeDelta: "); 81 | Serial.println(timeDelta); 82 | } 83 | 84 | // In Case Cad Drops, we use PrevRPM 85 | // to substitute (up to 4 seconds before reporting 0) 86 | if (timeDelta != 0) 87 | { 88 | prevCrankStaleness = 0; 89 | double timeMins = ((double)timeDelta) / 1024.0 / 60.0; 90 | rpm = ((double)deltaRotations) / timeMins; 91 | prevRPM = rpm; 92 | 93 | if(debug) 94 | { 95 | Serial.print("timeMins: "); 96 | Serial.println(timeMins); 97 | Serial.print("timeDelta != 0: rpm - "); 98 | Serial.println(rpm); 99 | } 100 | } 101 | else if (timeDelta == 0 && prevCrankStaleness < stalenessLimit) 102 | { 103 | rpm = prevRPM; 104 | prevCrankStaleness += 1; 105 | if(debug) 106 | { 107 | Serial.print("timeDelta == 0 and not stale yet, rpm -"); 108 | Serial.println(rpm); 109 | } 110 | } 111 | else if (prevCrankStaleness >= stalenessLimit) 112 | { 113 | rpm = 0.0; 114 | if(debug) 115 | { 116 | Serial.print("stale"); 117 | Serial.println(rpm); 118 | } 119 | } 120 | 121 | prevCumulativeCrankRev = cumulativeCrankRev; 122 | prevCrankTime = lastCrankTime; 123 | 124 | if(debug) 125 | { 126 | Serial.print("prevCumulativeCrankRev: "); 127 | Serial.println(prevCumulativeCrankRev); 128 | Serial.print("prevCrankTime: "); 129 | Serial.println(prevCrankTime); 130 | } 131 | 132 | cadence = (int)rpm; 133 | //Test 134 | //cadence = cadence + 2; 135 | 136 | 137 | if(debug) { 138 | Serial.print("CALLBACK("); 139 | Serial.print(pBLERemoteCharacteristic->getUUID().toString().c_str()); 140 | Serial.print(":"); 141 | Serial.print(length); 142 | Serial.print("):"); 143 | for(int x = 0; x < length; x++) { 144 | if(data[x] < 16) { 145 | Serial.print("0"); 146 | } 147 | Serial.print(data[x], HEX); 148 | } 149 | Serial.println(); 150 | } 151 | 152 | if(digitalRead(KEY_BUILTIN) == LOW) 153 | { 154 | esp_deep_sleep_start(); 155 | } 156 | } 157 | 158 | // Called on connect or disconnect 159 | class ClientCallback : public BLEClientCallbacks { 160 | void onConnect(BLEClient* pclient) { 161 | digitalWrite(LED,HIGH); 162 | Serial.println("Connected!"); 163 | } 164 | void onDisconnect(BLEClient* pclient) { 165 | connected = false; 166 | delete(client); 167 | client = nullptr; 168 | digitalWrite(LED,LOW); 169 | Serial.println("Disconnected!"); 170 | } 171 | }; 172 | 173 | class AdvertisedDeviceCallbacks: public BLEAdvertisedDeviceCallbacks { 174 | void onResult(BLEAdvertisedDevice advertisedDevice) { 175 | Serial.print("BLE Advertised Device found: "); 176 | Serial.println(advertisedDevice.toString().c_str()); 177 | if(advertisedDevice.getName().size() > 0) { 178 | BLEAdvertisedDevice * d = new BLEAdvertisedDevice; 179 | *d = advertisedDevice; 180 | addDevice(d); 181 | } 182 | } 183 | }; 184 | 185 | void updateDisplay() { 186 | Heltec.display->clear(); 187 | 188 | // Runtime 189 | Heltec.display->setFont(ArialMT_Plain_24); 190 | char buf[5]; 191 | const int minutes = int(runtime / 60000); 192 | itoa(minutes, buf, 10); 193 | Heltec.display->setTextAlignment(TEXT_ALIGN_RIGHT); 194 | Heltec.display->drawString(48, 0, buf); 195 | Heltec.display->setTextAlignment(TEXT_ALIGN_LEFT); 196 | Heltec.display->drawXbm(0, 4, clock_icon_width, clock_icon_height, clock_icon); 197 | Heltec.display->drawString(48, 0, ":"); 198 | const int seconds = int(runtime % 60000)/1000; 199 | if(seconds < 10) { 200 | buf[0] = '0'; 201 | itoa(seconds, &buf[1], 10); 202 | } else { 203 | itoa(seconds, buf, 10); 204 | } 205 | Heltec.display->drawString(54, 0, buf); 206 | 207 | // Cadence 208 | Heltec.display->drawXbm(0, 26, cadence_icon_width, cadence_icon_height, cadence_icon); 209 | itoa(cadence, buf, 10); 210 | Heltec.display->drawString(22, 22, buf); 211 | 212 | uint8_t progress = 0; 213 | if(cadence >= maxCadence) 214 | progress = 100; 215 | else 216 | progress = uint8_t((100 * cadence) / maxCadence); 217 | Heltec.display->drawProgressBar(0, 49, 126, 14, progress); 218 | 219 | Heltec.display->display(); 220 | } 221 | 222 | bool connectToServer() { 223 | Serial.print("Connecting to "); 224 | Serial.println(device->getName().c_str()); 225 | 226 | Heltec.display->clear(); 227 | Heltec.display->setLogBuffer(10, 50); 228 | Heltec.display->setFont(ArialMT_Plain_10); 229 | Heltec.display->println("Connecting to:"); 230 | Heltec.display->println(device->getName().c_str()); 231 | Heltec.display->drawLogBuffer(0, 0); 232 | Heltec.display->display(); 233 | 234 | client = BLEDevice::createClient(); 235 | client->setClientCallbacks(new ClientCallback()); 236 | client->connect(device); 237 | 238 | // Sometimes it immediately disconnects - client will be null if so 239 | delay(200); 240 | if(client == nullptr) { 241 | return false; 242 | } 243 | 244 | BLERemoteService* remoteService = client->getService(serviceUUID); 245 | if (remoteService == nullptr) { 246 | Serial.print("Failed to find service UUID: "); 247 | Serial.println(serviceUUID.toString().c_str()); 248 | client->disconnect(); 249 | return false; 250 | } 251 | Serial.println("Found device."); 252 | 253 | // Look for the sensor 254 | sensorCharacteristic = remoteService->getCharacteristic(notifyUUID); 255 | if (sensorCharacteristic == nullptr) { 256 | Serial.print("Failed to find sensor characteristic UUID: "); 257 | Serial.println(notifyUUID.toString().c_str()); 258 | client->disconnect(); 259 | return false; 260 | } 261 | sensorCharacteristic->registerForNotify(notifyCallback); 262 | Serial.println("Enabled sensor notifications."); 263 | 264 | 265 | Serial.println("Activated status callbacks."); 266 | 267 | return true; 268 | } 269 | 270 | void setup() { 271 | Serial.begin(115200); 272 | Serial.flush(); 273 | delay(50); 274 | 275 | Heltec.display->init(); 276 | Heltec.display->flipScreenVertically(); 277 | 278 | pinMode(LED_BUILTIN, OUTPUT); 279 | digitalWrite(LED_BUILTIN, LOW); 280 | 281 | pinMode(KEY_BUILTIN, OUTPUT); 282 | digitalWrite(KEY_BUILTIN, HIGH); 283 | 284 | BLEDevice::init(""); 285 | scanner = BLEDevice::getScan(); 286 | scanner->setAdvertisedDeviceCallbacks(new AdvertisedDeviceCallbacks()); 287 | scanner->setInterval(1349); 288 | scanner->setWindow(449); 289 | scanner->setActiveScan(true); 290 | } 291 | 292 | void loop() { 293 | // Start scan 294 | if(!connected){ 295 | Serial.println("Start Scan!"); 296 | Heltec.display->clear(); 297 | Heltec.display->drawXbm(64, 0, mountain_icon_width, mountain_icon_height, mountain_icon); 298 | Heltec.display->setLogBuffer(10, 50); 299 | Heltec.display->setFont(ArialMT_Plain_10); 300 | Heltec.display->println("Starting Scan.."); 301 | Heltec.display->drawLogBuffer(0, 0); 302 | Heltec.display->display(); 303 | scanner->start(11, false); // Scan for 10 seconds 304 | BLEDevice::getScan()->stop(); 305 | 306 | device = selectDevice(); // Pick a device 307 | if(device != nullptr) { 308 | connected = connectToServer(); 309 | if(!connected) { 310 | Serial.println("Failed to connect..."); 311 | Heltec.display->println("Failed to"); 312 | Heltec.display->println("connect..."); 313 | Heltec.display->drawLogBuffer(0, 0); 314 | Heltec.display->display(); 315 | delay(3100); 316 | return; 317 | } 318 | scanCount = 0; 319 | } else { 320 | Serial.println("No device found..."); 321 | Heltec.display->println("No device"); 322 | Heltec.display->println("found..."); 323 | Heltec.display->drawLogBuffer(0, 0); 324 | Heltec.display->display(); 325 | scanCount++; 326 | if(scanCount > 5) 327 | { 328 | esp_deep_sleep_start(); 329 | return; 330 | } 331 | delay(3100); 332 | return; 333 | } 334 | } 335 | 336 | // Update timer if cadence is rolling 337 | if(cadence > 0) { 338 | unsigned long now = millis(); 339 | runtime += now - last_millis; 340 | last_millis = now; 341 | } else { 342 | last_millis = millis(); 343 | } 344 | 345 | delay(200); // Delay 200ms between loops. 346 | updateDisplay(); 347 | } 348 | -------------------------------------------------------------------------------- /power.h: -------------------------------------------------------------------------------- 1 | /* 2 | https://rextester.com/l/r_online_compiler 3 | 4 | f <- function(x1,x2,a,b1,b2) {a * (b1^x1) * (b2^x2) } 5 | 6 | # generate some data 7 | x1 <- c(11,15,18,21,23,11,15,18,22,24) 8 | x2 <- c(80,80,80,80,80,100,100,100,100,100) 9 | y <- c(60,84,113,145,187,90,122,162,216,262) 10 | dat <- data.frame(x1,x2, y) 11 | 12 | # fit a nonlinear model 13 | fm <- nls(y ~ f(x1,x2,a,b1,b2), data = dat, start = c(a=3, b1=1.02,b2=1.09)) 14 | 15 | # get estimates of a, b 16 | co <- coef(fm) 17 | 18 | print(co) 19 | 20 | OUTPUT: 21 | a b1 b2 22 | 7.228959 1.090112 1.015343 23 | 24 | power = pow(1.090112, resisstance) * pow(1.015343, cadence) * 7.228958 25 | 26 | fmt.Println(math.Pow(1.090112, 18) * math.Pow(1.015343, 30.0) * 7.228958) 27 | 28 | Resistance 29 | https://www.desmos.com/calculator/j5fmz904ps 30 | 31 | Echelon Values 32 | 70,10,50 33 | 70,7,40 34 | 50,7,22 35 | 50,10,30 36 | 50,13,38 37 | 50,17,53 38 | 50,24,100 39 | 49,7,22 40 | 54,26,151 41 | 74,26,225 42 | 60,20,96 43 | a b1 b2 44 | 3.737140 1.023652 1.095726 45 | 46 | Peloton Values 47 | 80,30,60 48 | 80,35,84 49 | 80,40,113 50 | 80,45,145 51 | 80,50,187 52 | 100,30,90 53 | 100,35,122 54 | 100,40,162 55 | 100,45,216 56 | 100,50,262 57 | a b1 b2 58 | 3.165689 1.018363 1.053851 59 | 60 | Equation 61 | 1.023652^C * 1.095726^R * 3.737140 = 3.165689 * 1.018363^C * 1.053851^T 62 | Peleton R = -19.0654(-0.00518019*C - 0.0914172*R - 0.16595) 63 | 64 | */ 65 | 66 | // Calculate the power 67 | int getPower(int cadence, int resistance) { 68 | if(cadence == 0 || resistance == 0) return 0; 69 | return int(pow(1.090112, resistance) * pow(1.015343, cadence) * 7.228958); 70 | } 71 | 72 | int getPeletonResistance(int resistance) { 73 | int pr = int((0.0116058 * pow(resistance, 3)) + (-0.568462 * pow(resistance, 2)) + (10.4126 * resistance) - 31.4807); 74 | return pr < 0 ? 0 : pr; 75 | } 76 | --------------------------------------------------------------------------------