The IR Avoid Sensor works by sending infrared rays of certain frequency. When the infrared ray meets an obstacle(reflection surface), it is reflected and received by receiver. Then the corresponding indicator light is on. The sensor has a potentiometer knob you can adjust to change the detection distance.
Although the sensor has 4 PINs, only the first 3 are used. The last PIN, apparently does nothing (but correct me if i’m wrong). I went trying to work with it using the PIN – EN – as an activation sensor PIN (putting it in HIGH) and deactivating the sensor (putting it on LOW), but the result was the same. The sensor always worked. When reading, the input is always 1.
Here are the connections of the sensor (from GND to EN)
Features of Avoid sensor:
Working voltage: DC 3.3V-5V
Working current: 20mA
Working temperature: -10degree+50degree
Detection distance : 2-40cm
IO interface: 4 line (-/+/S/EN)
Output signal: TTL Level
Adjusting mode: Multi resistance regulation
Effective angle: 35°
Size: 4.5×1.1cm(approx)
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