Moisture sensor hardware
About the Moisture sensor hardware PCB
Moisture sensor hardware is an open source ESP32 PCB design by IMHarris, published on GitHub under the CC-BY-SA-4.0 license. It is a 2-layer board measuring 111 × 58 mm, with 34 components from 15 distinct parts.
Its main chip is the ESP32-DevKitC, from the ESP32 family. Other key parts include the TPS27081ADDCR, 74HC595 and CD4066BE. By type, the board carries 13 resistors, 8 capacitors, 7 ICs and 3 connectors.
It belongs with the sensors and iot & wireless designs in this gallery.
From the project
KiCad PCB design for ESP32 soil moisture monitoring system
KiCad hardware design for ESP32-based soil moisture monitoring system.
This repository contains the PCB design and schematics for an irrigation moisture sensor system. The board interfaces with resistance-based moisture sensors (I recommend Irrometer Watermark Sensors) and DS18B20 temperature sensors.
The board uses an SMX moisture sensor interface board to interact with up to 6 moisture sensors. The SMX board transmits AC power to the sensors which substantially reduces mineral accumulation and extends the life of the sensors. Because moisture sensors are sensitive to temperature, the…
Main components on the Moisture sensor hardware
Moisture sensor hardware bill of materials (BOM)
34 components, 15 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ESP32-DevKitC | ESP32-DevKitC | U1 |
| 2 | TPS27081ADDCR | SOT-23-6 | U2, U3 |
| 1 | 74HC595 | DIP-16_W7.62mm_Socket | U4 |
| 3 | CD4066BE | DIP-14_W7.62mm | U5, U6, U7 |
| 1 | Screw_Terminal_01x08 | PHOENIX_1990067 | J1 |
| 1 | Expansion | Molex_SL_171971-0010_1x10_P2.54mm_Vertical | J2 |
| 1 | Screw_Terminal_01x12 | PHOENIX_1990106 | J3 |
| 1 | 10164359-00011LF | AMPHENOL_10164359-00011LF | 5v in1 |
| 1 | SW_Slide_DPDT | DPDT Slide switch - CL-SB-22C-02 | DPDT1 |
| 1 | SMX Header | PinSocket_1x06_P2.54mm_Vertical | SMX1 |
| 6 | 0.1µF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C5, C6, C7, C8 |
| 2 | 10µF | CP_Radial_D5.0mm_P2.50mm | C3, C4 |
| 2 | 10k | R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1, R2 |
| 9 | 4.7k | R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R3, R4, R7, R8, R9, R10, R11, R12 +1 |
| 2 | 5.1k | R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R5, R6 |
Moisture sensor hardware design files
The KiCad project lives in the IMHarris/moisture-sensor-hardware repository on GitHub; these links point at the commit this page was built from.
- LayoutMoistureSensor1.kicad_pcb
- SchematicMoistureSensor1.kicad_sch
Moisture sensor hardware: common questions
What microcontroller does the Moisture sensor hardware use?
The Moisture sensor hardware is built around the ESP32-DevKitC, from the ESP32 family.
How big is the Moisture sensor hardware PCB?
The Moisture sensor hardware measures 111 × 58 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Moisture sensor hardware?
34 components, from 15 distinct parts. The full bill of materials is listed on this page.
Where can I download the Moisture sensor hardware design files?
From the IMHarris/moisture-sensor-hardware repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Moisture sensor hardware design in my own project?
Yes, under the terms of its CC-BY-SA-4.0 license, which IMHarris chose for the repository.
Can I test firmware for the Moisture sensor hardware without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.
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