├── README.md
└── messenger
    └── messenger.ino


/README.md:
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1 | Yes, these two are using two-way ESP-NOW connections to send simple messages. This was a challenging project, not because of the two-way ESP-NOW itself—I learned how to make two-way ESP-NOW communication by reading a great tutorial on the Random Nerd Tutorials site. The challenge was making this using the small M5Stack Atom S3 board, an ESP32-S3 device with a built-in 128x128 display, IR LED, push button, accelerometer, gyroscope, and more. Of course, one push button was not enough for this project, so I designed a simple PCB. The sponsor of this video is PCBWay. On their site, you can find and order these PCBs and read more information about this project. Along with PCBs, they offer many different services such as 3D printing, CNC machining, and more. The link is in the description; feel free to check it out. The PCB is simple but works great; the quality of their PCBs is always top-notch.
2 | 


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/messenger/messenger.ino:
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  1 | #include "M5AtomS3.h"
  2 | #include <TFT_eSPI.h>
  3 | #include "WiFi.h"
  4 | #include <esp_now.h>
  5 | TFT_eSPI tft = TFT_eSPI();
  6 | TFT_eSprite spr = TFT_eSprite(&tft);
  7 | 
  8 | uint8_t broadcastAddress[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
  9 | 
 10 | //colors
 11 | unsigned short light=0x8F1F;  
 12 | unsigned short dark=0x0169;
 13 | unsigned short darkest=0x0062;
 14 | unsigned short selected=0x701D;
 15 | unsigned short foreground;
 16 | unsigned short background;
 17 | unsigned short txt1=0xDEFB;
 18 | char letters[31]="QWERTYUIOPASDFGHJKL<ZXCVBNM., ";
 19 | String myMsg="";
 20 | 
 21 | int maxLength=19;
 22 | 
 23 | int up=6 ;
 24 | int down= 5;
 25 | int left=8 ;
 26 | int right=38 ;
 27 | int ok=7 ;
 28 | int send=39;
 29 | int buttonMy=41;
 30 | int butt[7]={6,5,8,38,7,39,41};
 31 | int deb[7]={0};
 32 | 
 33 | int chosenX=0;
 34 | int chosenY=0;
 35 | int chosen=0;
 36 | 
 37 | bool isMy[4]={0};
 38 | bool isMyTMP[4]={0};
 39 | 
 40 | String allMsg[4]={"hello, how are you.A",
 41 |                   "hello, now are you.B",
 42 |                   "hello, zow are you.C",
 43 |                   "QWERTZUIOPASDFGHJKLY"};
 44 | 
 45 | String allMsgTMP[4]={"hello, how are you.A",
 46 |                   "hello, now are you.B",
 47 |                   "hello, zow are you.C",
 48 |                   "QWERTZUIOPASDFGHJKLY"};
 49 | 
 50 | 
 51 | String success;
 52 | char msgSent[21];
 53 | char msgRecieved[21];
 54 | esp_now_peer_info_t peerInfo;
 55 | 
 56 | // Callback when data is sent
 57 | void OnDataSent(const uint8_t *mac_addr, esp_now_send_status_t status) {
 58 |   Serial.print("\r\nLast Packet Send Status:\t");
 59 |   Serial.println(status == ESP_NOW_SEND_SUCCESS ? "Delivery Success" : "Delivery Fail");
 60 |   if (status ==0){
 61 |     success = "Delivery Success :)";
 62 |   }
 63 |   else{
 64 |     success = "Delivery Fail :(";
 65 |   }
 66 | }
 67 | 
 68 | // Callback when data is received
 69 | void OnDataRecv(const uint8_t * mac, const uint8_t *incomingData, int len) {
 70 |   memcpy(&msgRecieved, incomingData, sizeof(msgRecieved));
 71 |   Serial.print("Bytes received: ");
 72 |   Serial.println(msgRecieved);
 73 |   sort();
 74 |   allMsg[3]=String(msgRecieved);
 75 |   isMy[3]=0;
 76 | }
 77 | 
 78 |    void sort()
 79 |    {
 80 |     for(int i=0;i<4;i++)
 81 |     {allMsgTMP[i]=allMsg[i];
 82 |     isMyTMP[i]=isMy[i];
 83 |     }
 84 |     for(int i=0;i<3;i++)
 85 |     {allMsg[i]=allMsgTMP[i+1];
 86 |     isMy[i]=isMyTMP[i+1];
 87 |     }
 88 |    }          
 89 | 
 90 |  void sendMsg()
 91 |  {
 92 |  sort();
 93 |  allMsg[3]=myMsg;
 94 |  isMy[3]=1;
 95 |  myMsg.toCharArray(msgSent, sizeof(msgSent));
 96 |  esp_err_t result = esp_now_send(broadcastAddress, (uint8_t *) &msgSent, sizeof(msgSent));
 97 |  myMsg="";
 98 |  }                 
 99 | 
100 | void setup() {
101 | 
102 |     pinMode(up,INPUT_PULLUP);
103 |     pinMode(down,INPUT_PULLUP);
104 |     pinMode(left,INPUT_PULLUP);
105 |     pinMode(right,INPUT_PULLUP);
106 |     pinMode(ok,INPUT_PULLUP);
107 |     pinMode(send,INPUT_PULLUP);
108 |     pinMode(buttonMy,INPUT_PULLUP);
109 | 
110 |     auto cfg = M5.config();
111 |     AtomS3.begin(cfg);
112 |     AtomS3.Display.setRotation(2);
113 |     AtomS3.Display.setBrightness(14);
114 |     spr.createSprite(128, 128);
115 | 
116 |      for(int i=0;i<4;i++)
117 |      allMsg[i]="";
118 | 
119 |        Serial.begin(115200);
120 | 
121 |   WiFi.mode(WIFI_STA);
122 | 
123 |   if (esp_now_init() != ESP_OK) {
124 |     Serial.println("Error initializing ESP-NOW");
125 |     return;
126 |   }
127 | 
128 |   esp_now_register_send_cb(OnDataSent);
129 |   
130 |   memcpy(peerInfo.peer_addr, broadcastAddress, 6);
131 |   peerInfo.channel = 0;  
132 |   peerInfo.encrypt = false;
133 |       
134 |   if (esp_now_add_peer(&peerInfo) != ESP_OK){
135 |     Serial.println("Failed to add peer");
136 |     return;
137 |   }
138 |   esp_now_register_recv_cb(OnDataRecv);
139 | }
140 | 
141 | void draw()
142 | {
143 |    spr.fillSprite(TFT_BLACK);
144 |    spr.fillRoundRect(2,2,124,50,2,darkest);
145 |    spr.fillRoundRect(4,70,120,14,2,dark);
146 |    spr.fillRoundRect(2,52,80,14,2,darkest);
147 |    spr.setTextColor(txt1,dark);
148 |    spr.drawString(myMsg,5,73); 
149 |    
150 |     for(int j=0;j<3;j++)
151 |     for(int i=0;i<10;i++)
152 |     {
153 |       if(i==chosenX && j==chosenY)
154 |       {background=selected; foreground=TFT_WHITE;}
155 |       else {
156 |       background=light; foreground=TFT_BLACK;
157 |       }
158 |     spr.setTextColor(foreground,background);
159 |     spr.fillRoundRect(5+(i*12),88+(j*14),10,12,2,background);  
160 |     spr.drawString(String(letters[j*10+i]),5+(i*12)+2,88+(j*14)+2); 
161 |     }
162 | 
163 |      spr.setTextColor(txt1,darkest);
164 |      for(int j=0;j<4;j++)
165 |      {
166 |       if(isMy[j]==1) 
167 |       spr.setTextColor(txt1,darkest);
168 |       else
169 |       spr.setTextColor(light,darkest);
170 |      spr.drawString(allMsg[j],5,6+(j*12)); 
171 |      }
172 | 
173 |      spr.setTextColor(TFT_ORANGE,TFT_BLACK);
174 |      spr.drawString(String(myMsg.length())+"/20",94,57); 
175 | 
176 |      spr.drawFastHLine(8, 54, 62, 0x52AA);
177 |      spr.setTextColor(0x39E7,darkest);
178 |      spr.drawString("ESP NOW",10,57); 
179 | 
180 |      spr.fillCircle(126,2,6,TFT_RED);
181 | 
182 |     AtomS3.Display.pushImage(0, 0, 128, 128, (uint16_t*)spr.getPointer());
183 | }
184 | 
185 | void loop() {
186 | 
187 | for(int i=0;i<7;i++)
188 | if(digitalRead(butt[i])==0)
189 | {
190 |   if(deb[i]==0)
191 |     {deb[i]=1;
192 |       if(butt[i]==right)
193 |       {chosenX++; if(chosenX>9) chosenX=0;}
194 | 
195 |        if(butt[i]==left)
196 |       {chosenX--; if(chosenX<0) chosenX=9;}
197 | 
198 |         if(butt[i]==down)
199 |       {chosenY++; if(chosenY>2) chosenY=0;}
200 | 
201 |        if(butt[i]==up)
202 |       {chosenY--; if(chosenY<0) chosenY=2;}
203 | 
204 |        if(butt[i]==ok)
205 |       {
206 |         if(letters[chosenY*10+chosenX]=='<' && myMsg.length()<21)
207 |         myMsg=myMsg.substring(0,myMsg.length()-1);
208 |         else
209 |         myMsg=myMsg+String(letters[chosenY*10+chosenX]);
210 |       }
211 | 
212 |        if(butt[i]==send)
213 |        { 
214 |         sendMsg();    
215 |        }
216 |     }
217 | }else deb[i]=0;
218 | 
219 | draw();
220 | }


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