เซ็นเซอร์วัดความชื้นในดิน Soil Moisture Sensor and Soil Detector Module Soil Moisture Test Soil Humidity Test Corrosion Resistance Probe for Arduino หัววัดเป็นสแตนเลส (STAINLESS ) ไม่ผุ ไม่เป็นสนิม

principle:

 the soil humidity probe detects the humidity, and the voltage comparator judges the humidity. When the humidity is greater than the set value, DO outputs low level.

Instructions for use:

1. [+] is connected to the positive pole of the power supply; [-] is connected to the negative pole of the power supply; do not connect it reversely, otherwise the chip may be burned. After the power is connected, the [P] power indicator lights up. The module is working properly.

2. The blue potentiometer is adjusted clockwise / counterclockwise, which can improve / reduce the sensitivity of the probe. Take the thermistor as an example. Suppose the default is 25 C trigger, [DO] the output is active low. When the temperature is lower than 25 ℃, it can be triggered. Counter clockwise trigger is higher than 25 ℃.

3. When the potentiometer is adjusted clockwise until the [S] output indicator light is on, it means that the adjustment range has exceeded the test threshold. When it is adjusted anticlockwise until it cannot be adjusted, it exceeds the threshold. When adjusting, it should not exceed the threshold, otherwise it can not be used normally.

Potentiometer adjustment is only related to [DO] port, and is not associated with [AO] output. [AO] the output is analog (voltage), which can be detected directly through the AD port of single chip microcomputer.