The module has a pair of infrared LEDs, an emitter and a receiver. The emitting LED sends infrared light pulses at a certain frequency. When the light hits an obstacle is reflected back to the receiver LED.
The KY-032 has 4 pins: GND, +, S (out), and EN. The jumper makes the module permanently enabled so its always detecting for obstacles. To control the state of the sensor remove the jumper and use the EN pin, a HIGH signal will enable the sensor and a LOW signal will disable it.
You can adjust the detection distance by turning the left knob, turn it to the middle for maximum distance. The right knob controls the frequency of the emitting IR pulse, turn it clockwise all the way to set the emitter to the right frequency required to work with the receiver.
|Working voltage||3.3V – 5V DC|
|Working current||≥ 20mA|
|Working temperature||-10°C – 50°C [14°F – 122°F]|
|Detection distance||2cm – 40cm [0.79in – 15.75in]|
|IO interface||4-wire interface (-/+/S/EN)|
|Output signal||TTL level (low level if obstacle detecter, high if no obstacle)|
|Adjustment method||multi-turn resistance adjustment|
|IR pulse frequency||38kHz according to HS0038DB datasheet|