| Price | $2.50 |
|---|---|
| Category | Sensors |
| Availability | In stock |
| Delivery | Shipped across Lebanon, or collect from the lab |
Two parts joined by a short lead: a forked probe that goes into the soil, and a small LM393 board that reads it. Current passes between the prongs, wet soil conducts better than dry, and you get an analog A0 that changes with moisture plus a digital D0 that trips at the point you dial in on the trim pot. One caution worth planning around - resistive probes corrode when left powered in damp soil, so drive the probe from a GPIO pin and switch it on only while you take a reading.
Key features
- Resistive fork probe plus LM393 comparator board
- Analog A0 and digital D0 outputs
- Trim pot sets the dry / wet trip point
- 3.3 - 5V supply, around 15 mA
- Probe corrodes if left powered - switch it to read
- For automatic watering and plant monitoring
Details
Specifications
| Type | Resistive soil-moisture probe + comparator board |
|---|---|
| Operating voltage | 3.3 - 5V DC |
| Current | about 15 mA |
| Outputs | Analog A0 + digital D0 |
| Output swing | 0V to supply rail |
| Comparator | LM393 |
| Threshold | Onboard trim pot |
| Pins | 4 (VCC, GND, D0, A0) |
| Supplied as | 2 boards joined by a 2-wire lead |
