Moisture
This page describes how to connect a moisture sensor with analog data output. If you need a digital output you can modify the setup easily.
A sketch how to connect moisture sensor with the raspberry:
See also e.g. RasberryPi 3 pin layout for information about the pin numbers.
Client configuration:
More about client configuration.
The moisture sensor consists of two parts, YL-69 (probe) and YL-39 (logic).
YL-39 has two pins on one side that is connected to YL-69 and four pins on the other side:
- VCC: 3.3V (connected to Raspi 3.3 VDC Power)
- GND (connected to Raspi Ground)
- A0 : analog output (connected to CH0 on MCP3008)
- D0 : digital output that goes LOW or HIGH only (can be optionally connected to MCP3008).
The MCP3008 chip is connected to Raspi using the following scheme:
- VDD: 3.3V
- VREF: 3.3V
- AGND: Ground
- CLK: Pin #23 (SCLK)
- DOUT: Pin #21 (MISO)
- DIN: Pin #19 (MOSI)
- CS/SHDN: Pin #24 (CE0)
- DGND: Ground
Once wired, see pi4j module for the software implementation.