LinkSprite infrared roadblock sensor uses an integrated infrared transceiver.  74LS00 is used to construct a resonator. Adjust the potentiometer can adjust the frequency of the infrared light to be the center of receiver, i.e. 38kHz. Now the...

Flame sensor is only sensitive to the light in the frequency band of infrared and ultrviolet. This breakout board has 3 pins: sensor output signal, power, and ground. The sensor output signal is an analog signal. In an indoor enviroment, the...