The soil moisture sensor module , built around the LM393 comparator, gives an active-low (L) level output when the soil is dry (determined by a pre-setted threshold value). This digital output (wet ...

At one end is an LED and at the other the LDR, and when attached to a glove it provides a finger sensor without the fuss. ... and with a simple divider circuit a voltage can be read by an Arduino.

Following is the Arduino Sketch, tailored for Digispark Attiny85 Development board! /* * Grove-mini PIR Motion Sensor Module ... Moreover, the S16-L221D sensor lets you add a light dependent resistor ...