├── Hardware
├── attiny-resistive-soil.kicad_pcb
├── attiny-resistive-soil.kicad_pro
└── attiny-resistive-soil.kicad_sch
├── LICENSE
├── README.md
└── Software
└── main.ino
/Hardware/attiny-resistive-soil.kicad_pcb:
--------------------------------------------------------------------------------
1 | (kicad_pcb (version 20221018) (generator pcbnew)
2 |
3 | (general
4 | (thickness 2.33)
5 | )
6 |
7 | (paper "A4")
8 | (layers
9 | (0 "F.Cu" signal)
10 | (31 "B.Cu" signal)
11 | (32 "B.Adhes" user "B.Adhesive")
12 | (33 "F.Adhes" user "F.Adhesive")
13 | (34 "B.Paste" user)
14 | (35 "F.Paste" user)
15 | (36 "B.SilkS" user "B.Silkscreen")
16 | (37 "F.SilkS" user "F.Silkscreen")
17 | (38 "B.Mask" user)
18 | (39 "F.Mask" user)
19 | (40 "Dwgs.User" user "User.Drawings")
20 | (41 "Cmts.User" user "User.Comments")
21 | (42 "Eco1.User" user "User.Eco1")
22 | (43 "Eco2.User" user "User.Eco2")
23 | (44 "Edge.Cuts" user)
24 | (45 "Margin" user)
25 | (46 "B.CrtYd" user "B.Courtyard")
26 | (47 "F.CrtYd" user "F.Courtyard")
27 | (48 "B.Fab" user)
28 | (49 "F.Fab" user)
29 | (50 "User.1" user)
30 | (51 "User.2" user)
31 | (52 "User.3" user)
32 | (53 "User.4" user)
33 | (54 "User.5" user)
34 | (55 "User.6" user)
35 | (56 "User.7" user)
36 | (57 "User.8" user)
37 | (58 "User.9" user)
38 | )
39 |
40 | (setup
41 | (stackup
42 | (layer "F.SilkS" (type "Top Silk Screen"))
43 | (layer "F.Paste" (type "Top Solder Paste"))
44 | (layer "F.Mask" (type "Top Solder Mask") (thickness 0.01))
45 | (layer "F.Cu" (type "copper") (thickness 0.4))
46 | (layer "dielectric 1" (type "core") (thickness 1.51) (material "FR4") (epsilon_r 4.5) (loss_tangent 0.02))
47 | (layer "B.Cu" (type "copper") (thickness 0.4))
48 | (layer "B.Mask" (type "Bottom Solder Mask") (thickness 0.01))
49 | (layer "B.Paste" (type "Bottom Solder Paste"))
50 | (layer "B.SilkS" (type "Bottom Silk Screen"))
51 | (copper_finish "None")
52 | (dielectric_constraints no)
53 | )
54 | (pad_to_mask_clearance 0)
55 | (pcbplotparams
56 | (layerselection 0x0000008_7ffffffe)
57 | (plot_on_all_layers_selection 0x0000008_00000000)
58 | (disableapertmacros false)
59 | (usegerberextensions false)
60 | (usegerberattributes true)
61 | (usegerberadvancedattributes true)
62 | (creategerberjobfile true)
63 | (dashed_line_dash_ratio 12.000000)
64 | (dashed_line_gap_ratio 3.000000)
65 | (svgprecision 4)
66 | (plotframeref false)
67 | (viasonmask false)
68 | (mode 1)
69 | (useauxorigin false)
70 | (hpglpennumber 1)
71 | (hpglpenspeed 20)
72 | (hpglpendiameter 15.000000)
73 | (dxfpolygonmode true)
74 | (dxfimperialunits true)
75 | (dxfusepcbnewfont true)
76 | (psnegative false)
77 | (psa4output false)
78 | (plotreference true)
79 | (plotvalue true)
80 | (plotinvisibletext false)
81 | (sketchpadsonfab false)
82 | (subtractmaskfromsilk false)
83 | (outputformat 1)
84 | (mirror false)
85 | (drillshape 0)
86 | (scaleselection 1)
87 | (outputdirectory "./")
88 | )
89 | )
90 |
91 | (net 0 "")
92 | (net 1 "VCC")
93 | (net 2 "GND")
94 | (net 3 "Buzzer")
95 | (net 4 "MISO")
96 | (net 5 "MOSI")
97 | (net 6 "RST")
98 | (net 7 "Net-(R1-Pad2)")
99 | (net 8 "PWR_CHK")
100 | (net 9 "Soil_Check")
101 |
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103 | (tstamp 3b3beb47-d013-4e2f-9c02-6d2b55afade3)
104 | (at 84.5566 53.8226 90)
105 | (descr "http://www.keyelco.com/product-pdf.cfm?p=726")
106 | (tags "CR2032 BR2032 BatteryHolder Battery")
107 | (property "Sheetfile" "attiny-resistive-soil.kicad_sch")
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241 | (scale (xyz 1 1 1))
242 | (rotate (xyz 0 0 0))
243 | )
244 | )
245 |
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249 | (descr "8-Lead Plastic Small Outline (SM) - 5.28 mm Body [SOIC] (http://ww1.microchip.com/downloads/en/PackagingSpec/00000049BQ.pdf)")
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/Hardware/attiny-resistive-soil.kicad_pro:
--------------------------------------------------------------------------------
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35 | "other_text_upright": false,
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38 | "height": 3.0,
39 | "width": 3.0
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42 | "silk_text_italic": false,
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46 | "silk_text_upright": false,
47 | "zones": {
48 | "min_clearance": 0.5
49 | }
50 | },
51 | "diff_pair_dimensions": [
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53 | "gap": 0.0,
54 | "via_gap": 0.0,
55 | "width": 0.0
56 | }
57 | ],
58 | "drc_exclusions": [],
59 | "meta": {
60 | "version": 2
61 | },
62 | "rule_severities": {
63 | "annular_width": "error",
64 | "clearance": "error",
65 | "connection_width": "warning",
66 | "copper_edge_clearance": "error",
67 | "copper_sliver": "warning",
68 | "courtyards_overlap": "error",
69 | "diff_pair_gap_out_of_range": "error",
70 | "diff_pair_uncoupled_length_too_long": "error",
71 | "drill_out_of_range": "error",
72 | "duplicate_footprints": "warning",
73 | "extra_footprint": "warning",
74 | "footprint": "error",
75 | "footprint_type_mismatch": "ignore",
76 | "hole_clearance": "error",
77 | "hole_near_hole": "error",
78 | "invalid_outline": "error",
79 | "isolated_copper": "warning",
80 | "item_on_disabled_layer": "error",
81 | "items_not_allowed": "error",
82 | "length_out_of_range": "error",
83 | "lib_footprint_issues": "warning",
84 | "lib_footprint_mismatch": "warning",
85 | "malformed_courtyard": "error",
86 | "microvia_drill_out_of_range": "error",
87 | "missing_courtyard": "ignore",
88 | "missing_footprint": "warning",
89 | "net_conflict": "warning",
90 | "npth_inside_courtyard": "ignore",
91 | "padstack": "warning",
92 | "pth_inside_courtyard": "ignore",
93 | "shorting_items": "error",
94 | "silk_edge_clearance": "warning",
95 | "silk_over_copper": "warning",
96 | "silk_overlap": "warning",
97 | "skew_out_of_range": "error",
98 | "solder_mask_bridge": "error",
99 | "starved_thermal": "error",
100 | "text_height": "warning",
101 | "text_thickness": "warning",
102 | "through_hole_pad_without_hole": "error",
103 | "too_many_vias": "error",
104 | "track_dangling": "warning",
105 | "track_width": "error",
106 | "tracks_crossing": "error",
107 | "unconnected_items": "error",
108 | "unresolved_variable": "error",
109 | "via_dangling": "warning",
110 | "zones_intersect": "error"
111 | },
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114 | "min_clearance": 0.0,
115 | "min_connection": 0.0,
116 | "min_copper_edge_clearance": 0.0,
117 | "min_hole_clearance": 0.25,
118 | "min_hole_to_hole": 0.25,
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121 | "min_resolved_spokes": 2,
122 | "min_silk_clearance": 0.0,
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128 | "min_via_diameter": 0.5,
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130 | "solder_mask_min_width": 0.0,
131 | "solder_mask_to_copper_clearance": 0.0,
132 | "use_height_for_length_calcs": true
133 | },
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137 | "td_curve_segcount": 5,
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--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
1 | GNU GENERAL PUBLIC LICENSE
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674 | .
675 |
--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # Moisture-Duck
2 | ATtiny13A Resistive Soil Sensor for Duck Lovers
3 |
4 |
5 | Moisture-Duck helps you keep track of your plants' soil moisture and alerts you if they need watering. It utilizes the resistance measurement technique to gauge soil moisture levels. Two probes, in combination with the substrate, constitute a variable resistor. Greater soil moisture translates to improved conductivity and decreased electrical resistance. With the addition of a 12k fixed resistor, the system creates a voltage divider. The microcontroller's ADC measures this voltage. The design is inspired by the SparkFun Soil Moisture Sensor.
6 |
7 | Description:
8 | ------------
9 | The Moisture Duck is a device that measures soil moisture and emits an acoustic and optical signal if the soil is too dry. The device is based on ATtiny13, which spends most of its time in sleep mode and wakes up every eight seconds to take measurements. It can also be activated by pressing the TEST button, and the correct threshold value can be set by turning the potentiometer. To calibrate the device, it should be placed in dry soil and the potentiometer should be adjusted until the alarm is triggered. The device is compiled using MicroCore and default settings should be left unchanged. Arduino core functions and libraries are not used, and the makefile can be used for compilation without Arduino IDE. The fuse settings are -U lfuse:w:0x3b:m -U hfuse:w:0xff:m.
10 |
11 | Compiling and Uploading:
12 | ------------
13 |
14 | You can program the ATtiny either before soldering using an SOP adapter, or after soldering using ICSP pins. The AVR Programmer Adapter can help with this.
15 | If using the Arduino IDE
16 |
17 | Make sure you have installed MicroCore.
18 | Go to Tools -> Board -> MicroCore and select ATtiny13.
19 | Go to Tools and choose the following board options:
20 | Clock: 128 kHz internal osc.
21 | BOD: BOD disabled
22 | Timing: Micros disabled
23 | Connect your programmer to your PC and to the ATtiny.
24 | Go to Tools -> Programmer and select your ISP programmer (e.g. USBasp).
25 | Go to Tools -> Burn Bootloader to burn the fuses.
26 | Open main.ino and click Upload.
27 |
28 | If using the precompiled hex-file
29 |
30 | Make sure you have installed avrdude.
31 | Connect your programmer to your PC and to the ATtiny.
32 | Open a terminal.
33 | Navigate to the folder with the hex-file.
34 | Execute the following command (if necessary replace "usbasp" with the programmer you use):
35 |
36 | avrdude -c usbasp -p t13 -U lfuse:w:0x3b:m -U hfuse:w:0xff:m -U flash:w:main.hex
37 |
38 | If using the makefile (Linux/Mac)
39 |
40 | Make sure you have installed avr-gcc toolchain and avrdude.
41 | Connect your programmer to your PC and to the ATtiny.
42 | Open a terminal.
43 | Navigate to the folder with the makefile and sketch.
44 | Run PROGRMR=usbasp make install to compile, burn the fuses and upload the firmware (change PROGRMR accordingly).
45 |
--------------------------------------------------------------------------------
/Software/main.ino:
--------------------------------------------------------------------------------
1 | // ===================================================================================
2 | // Project: Moisture-Duck - Soil Moisture Monitor based on ATtiny13A
3 | // Version: v1.0
4 | // Year: 2023
5 | // Github: https://github.com/MakersFunDuck
6 | // Youtube: https://www.youtube.com/@makersfunduck
7 | // License: GNU General Public License v3.0
8 | // ===================================================================================
9 | //
10 | // Description:
11 | // ------------
12 | // The ATtiny13 is programmed to enter sleep mode for most of the time.
13 | // It utilizes the watchdog timer to wake up every 2 minutes and measure soil moisture,
14 | // comparing it to a preset threshold value.
15 | // If the soil is too dry, it triggers a brief acoustic signal from the buzzer before going back to sleep mode.
16 | //
17 | // Additionally, the Moisture-Duck can also be activated by pressing the TEST button. (pin
18 | // change interrupt). It outputs an acoustic signal to indicate if the battery power is sufficient,
19 | // followed by measurements of soil moisture until the button is released.
20 |
21 | //
22 | // To calibrate the Moisture-Duck, it should be placed in slightly dry soil,
23 | // Then voltage
24 | //
25 | // Wiring:
26 | // -------
27 | // +-\/-+
28 | // --- RST ADC0 PB5 1|° |8 Vcc
29 | // Soil_Check ------- ADC3 PB3 2| |7 PB2 ADC1 -------- PWR_CHK
30 | // BUZZER ----------- ADC2 PB4 3| |6 PB1 AIN1 OC0B --- TEST
31 | // GND 4| |5 PB0 AIN0 OC0A --- PWR
32 | // +----+
33 | //
34 | // Compilation Settings:
35 | // ---------------------
36 | // Controller: ATtiny13A
37 | // Core: MicroCore (https://github.com/MCUdude/MicroCore)
38 | // Clockspeed: 128 kHz internal
39 | // BOD: BOD disabled
40 | // Timing: Micros disabled
41 | //
42 | // You can keep the other default settings as they are. Don't forget to "Burn bootloader"!
43 | // before proceeding.
44 | // There are no Arduino core functions or libraries incorporated in this project.
45 | // You can use the makefile for compiling without the Arduino IDE.
46 | // To program without Arduino IDE Fuse settings are: -U lfuse:w:0x3b:m -U hfuse:w:0xff:m
47 |
48 |
49 |
50 | // ===================================================================================
51 | // Libraries and Definitions
52 | // ===================================================================================
53 |
54 | // Libraries
55 | #include // for gpio
56 | #include // for the sleep modes
57 | #include // for the interrupts
58 | #include // for the watch dog timer
59 | #include // for delays
60 |
61 |
62 |
63 |
64 | // Pin definitions
65 | #define PWR_PIN PB0 // power pin output
66 | #define BUZZER_PIN PB4 // buzzer pin output
67 | #define TEST_PIN PB1 // test button input
68 | #define SOIL_PIN PB3 // Soil pin input
69 | #define PWR_CHK PB2 // battery check input
70 |
71 | // ADC port definitions
72 | #define Soil_Check 3 // ADC port of measurement
73 | #define VCC_Check 2 // ADC port of measurement
74 |
75 | uint8_t count = 0; //Watchdog counter
76 | #define V_REF 1100 // internal reference voltage in mV
77 |
78 | //Functions
79 | void resetWatchdog(void);
80 | void sleep(void);
81 | uint8_t get_vcc(void);
82 | void beep(int num_times);
83 | uint16_t readADC(uint8_t port);
84 | void delay_ms(uint16_t ms);
85 |
86 | uint8_t vcccount = 0; //VCC measurement count
87 |
88 |
89 | // ===================================================================================
90 | // Watchdog and Sleep Implementation
91 | // ===================================================================================
92 |
93 |
94 |
95 | // Reset watchdog timer
96 | void resetWatchdog(void) {
97 | cli(); // timed sequence coming up
98 | wdt_reset(); // reset watchdog
99 | MCUSR = 0; // clear various "reset" flags
100 | WDTCR = (1< 15) // if interrupted 15. times ( after 15*8sec = 120s = 2min )
167 | {
168 | count = 0;
169 | }
170 | else{
171 | count++;
172 | sleep();
173 | }
174 | }
175 |
176 |
177 |
178 | // ===================================================================================
179 | // Main Function
180 | // ===================================================================================
181 |
182 | int main(void) {
183 |
184 | // Reset watchdog timer
185 | resetWatchdog(); // do this first in case WDT fires
186 |
187 | // Disable unused peripherals and set sleep mode to save power
188 | ACSR = (1< 15){
212 | //uint16_t vcc = readVCC();
213 | //if (vcc<1768) beep(8); //battery low alarm
214 |
215 | /*
216 |
217 | Voltage = ADC_value * Vref / 1024
218 | = 1768 * 1.1V / 1024
219 | = 1,89V
220 | */
221 | // vcccount = 0;
222 | // }
223 |
224 | PORTB |= (1<