OHM-0008
ESP32-C3 Soil Moisture Node — 2-layer, 68.2 × 48.8 mm + probe
Design demo2 layersRev 008
- MCU
- ESP32-C3
- Input
- 1S Li-ion + USB-C 5 V
- Layers
- 2
- Size
- 68.2 × 48.8 mm + 25 × 100 mm probe
- Parts
- 50
- Assembly
- Single-sided
- Fabrication
- Not fabricated
- Physical testing
- Not physically tested
Shipping extra
01
Prompt
Battery-powered ESP32 soil moisture sensor node: capacitive soil moisture sensing with a PCB electrode on a probe about 100 x 25 mm, an I2C temperature/humidity sensor (e.g. SHT4x), one 18650 Li-ion cell charged from USB-C at about 500 mA with charge status LED, 3.3 V low-quiescent regulator, deep sleep current under 20 uA, Wi-Fi reporting every 15 minutes. Two-layer board.
02
Schematic
03
Layout & 3D
04
Key features
A generated ESP32-C3 node with a long capacitive electrode built into the PCB, SHT4x air sensing, Li-ion battery input and USB-C charging. Deep sleep and Wi-Fi reporting were design requirements; power draw and sensor accuracy have not been measured on hardware.
- •Integrated 25 × 100 mm capacitive soil probe
- •ESP32-C3 with Wi-Fi and SHT4x air sensor
- •18650 Li-ion input, USB-C charging and charge indicator
- •Two-layer main board with probe extension
05
Notes
- Source: agent-pcb-mcp 0.7.1 run soil-blk, board revision r008. Automated checks: 0 unrouted, 0 DRC errors, 0 ERC errors and 1 ERC warning; 60 DRC warnings remain, including an electrode-edge waiver.
- Battery connector polarity, regulator dropout, 3.3 V trace width and the high-impedance probe signal need human review before fabrication.
- No deep-sleep current, Wi-Fi interval, charging or soil calibration has been verified on a physical board.
06
Files
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