2 layers96 × 70 mm
2 layers30 × 126.9 mm
Mad PlantBug
Incomprehensible/Mad_PlantBug1DIY and open source soil moisture sensor 🪴
- Size
- 30 × 126.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 41
- Nets
- 49
- Pads
- 137
- Tracks, vias
- 240, 54
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 17 Feb 2024
- Updated
- 9 Jan 2025
Overview
Mad PlantBug is an open-source printed circuit board by Incomprehensible, from the Incomprehensible/Mad_PlantBug repository on GitHub, published under the MIT licence. It is a 2-layer board of 30 × 126.9 mm with 41 parts on 49 nets, routed with 240 tracks and 54 vias.
It is built around the TLV333IDBVR-MS, TMP102AIDRLR(UMW) and ALS-PDIC15-21B/TR8, with the MSK12C02, 1N5819WS and AO3401A among its other parts. Its parts include 15 resistors, 6 capacitors, 4 diodes, 3 ICs and 3 switches. It belongs with the home automation and IoT and sensors and measurement boards of this library.
Main components
8
TLV333IDBVR-MS
SOT-23-5-2.75V~-900mV、900mV~2.75V -25℃~+125℃ 0.1V/us 1 1.8V~5.5V 10nV/℃ 13.5uA 135dB 1pA 1pA 1uV 550kHz 79.4nV/√Hz@1kHz Rail-to-Rail Input, Rail-to-Rail Output Zero drift / auto-zero、Reverse-phase input protection SOT-23-5 Precision Op Amps ROHSMSKSEMIOperational Amplifier
TMP102AIDRLR(UMW)
SOT-563-40℃~+125℃ 1.4V~5.5V 12bit 26ms I2C、SMBus Temperature threshold monitoring、Low-power standby、Configurable temperature output ±0.5℃ SOT-563 Temperature Sensors ROHSUMWTemperature Sensors
ALS-PDIC15-21B/TR8
SMD-4P,3.2x1.6mm-40℃~+85℃ 1.5V~5.5V SMD-4P,3.2x1.6mm Ambient Light Sensors ROHSEverlight ElectronicsAmbient Light Sensors
MSK12C02
SMD,8x2.8mm-20℃~+70℃ 1.4mm 10000 times 12V 2.8mm 50mA 8mm SMD(SMT) Tab SPDT Surface Mount, Right Angle SMD,8x2.8mm Slide Switches ROHSSHOU HANSlide Switches
1N5819WS
SOD-3231 Independent 1A 25A 40V 500uA@40V 600mV@1A SOD-323 Schottky Diodes ROHSGuangdong HottechSchottky Diodes
AO3401A
SOT-231 P-Channel 14nC@10V 30V 47mΩ@10V、60mΩ@4.5V、85mΩ@2.5V 4A 55pF 645pF 80pF 900mV SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETsMY-2032-08
--25~85℃ Battery buckle CR2032 Nickel plated Phosphor bronze - ROHSMYOUNGButton And Strip Battery ConnectorYJL2302B
SOT-23(TO-236)-55℃~+150℃ 1 N-channel 2.9nC@4.5V 20V 280pF 29pF 3A 46pF 700mW 780mV 80mΩ@2.5V N-Channel SOT-23(TO-236) MOSFETs ROHSYangzhou Yangjie Electronic TechnologyMOSFETs
README
README.mdMad_PlantBug
Low-power capacitive soil moisture sensor with BLE connectivity.
Features
- powered via CR2032 coin battery
- transmits telemetry via BLE
- measures ambient light and temperature
- visual indication via LED
| Top | Bottom |
|---|---|
 |  |
How it works
This sensor determines the amount of soil moisture by measuring changes in capacitance of the probe submerged in soil.
Insertable part forms a parasitic coplanar capacitor which uses soil as a dielectric medium.
As the environment around the capacitor changes depending on whether the soil becomes wetter or drier, so does it capacitance.
Together with a resistance the probe forms an RC low-pass filter.
Changes in capacitance shape the output waveform observed by the sensor.
Measurement pipeline logic is as follows:
environment changes -> capacitance changes -> cutoff frequency changes -> peak amplitude changes
Capacitance measurement
- Clean PCB measurement in air: ~59pF
- Fully submerged in water: 2nF
Assembly & measurements
Current issues
- CR2032 footprint and power pins connection is incorrect.
Parts
41| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | R_Pullup | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R1, R18, R19 |
| 2 | MSK12C02 | Mad_PlantBug:MSK12C02 | S1, S2 |
| 2 | R_Div | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R20, R21 |
| 2 | R_Inrush | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R5, R9 |
| 2 | R_Pulldown | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R3, R12 |
| 1 | 1N5819WS | Mad_PlantBug:D_SOD-323_HandSoldering | D3 |
| 1 | ALIVE_LED | LED_SMD:LED_0603_1608Metric | D2 |
| 1 | ALS-PDIC15-21B | Mad_PlantBug:ALS-PDIC15-21BTR8 | D4 |
| 1 | AO3401A | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | C_Bypass | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C9 |
| 1 | C_Debounce | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | C_Dec | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C2 |
| 1 | C_Dec | Capacitor_SMD:C_0603_1608Metric | C6 |
| 1 | C_Hold | Capacitor_SMD:C_0603_1608Metric | C4 |
| 1 | C_extra | Capacitor_SMD:C_0402_1005Metric | C3 |
| 1 | Conn_01x03 | Mad_PlantBug:MOLEX_530480310 | J2 |
| 1 | LOGO | Mad_PlantBug:brain_logo | G*** |
| 1 | MY-2032-08 | Mad_PlantBug:MY203208 | H1 |
| 1 | PTS526 | Mad_PlantBug:PTS526SK15SMTR2LFS | S3 |
| 1 | PWR_LED | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | RXI | TestPoint:TestPoint_Pad_1.0x1.0mm | TP3 |
| 1 | R_Discharge | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R6 |
| 1 | R_Dump | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R2 |
| 1 | R_Led | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R4 |
| 1 | R_Sense | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R7 |
| 1 | R_Sense | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R13 |
| 1 | R_protect | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R8 |
| 1 | TLV333IDBVR | Mad_PlantBug:TLV333-SOT95P280X145-5N | U2 |
| 1 | TMP102AIDRLR | Mad_PlantBug:SOTFL50P160X60-6N | IC1 |
| 1 | TXO | TestPoint:TestPoint_Pad_1.0x1.0mm | TP2 |
| 1 | Test_C_Sense | TestPoint:TestPoint_Pad_1.0x1.0mm | TP1 |
| 1 | YJ-14015 | Mad_PlantBug:YJ-14015-Module | U1 |
| 1 | YJL2302B | Mad_PlantBug:SOT-23-3 | Q2 |
The 39 most common of 41 parts.
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Questions
How big is the Mad PlantBug PCB?
It measures 30 × 126.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Mad PlantBug use?
41 parts, built around the TLV333IDBVR-MS, TMP102AIDRLR(UMW), ALS-PDIC15-21B/TR8 and MSK12C02. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Mad PlantBug KiCad files?
From the Incomprehensible/Mad_PlantBug repository on GitHub, at the commit this page was made from: the board is KiCad/Mad_PlantBug.kicad_pcb and its schematic KiCad/Mad_PlantBug.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Mad PlantBug design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).