The transmitter and receiver circuits of the infrared alarm system shown here have been designed for a range of several meters, almost independent of ambient light conditions. Only in the rare case of ...

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 ...

But the circuit in the figure shows an infrared close-object alert system built around two popular and less expensive integrated circuits ... sensor contains a phototransistor and an infrared LED.

In this article, we implement a rain and ice sensor by analyzing the reflection ... where +12 V is the main voltage source. 3. IR LED driving circuit. Based on experience, the TIP121 Darlington ...