It is based on the working of the popular IR sensor Module TSOP1738 which senses 38 kHz Infrared pulses from the IR LED of the transmitter. Range of the circuit is about 5 meters if the transmitter ...

I needed a multichannel line tracker sensor ... the YL-70 module is the power supply indicator and the rest (D1 to D4) are signal indicators. Each signal LED illuminates as its corresponding channel ...

At the heart of the circuit lies a CNY70 reflective opto sensor module. The sensor contains a phototransistor and an infrared LED. The LED emits infrared light, and the phototransistor works as a ...