Infrared modulation modulates the control signal on the carrier, because the modulated signal can be transmitted farther and the anti-interference ability is stronger, just like the radio signal. If modulation is not used, it is easy to receive interference by level transmission, and the efficiency is not high. It can only be received by photodiode, and the anti-interference ability is weak. If modulation, a high-sensitivity receiver can be used, and a carrier detection circuit is included therein. Has the ability to suppress interference.
Lithium Battery Cr17505,3V Lithium Battery,Smoke Detector Batteries,Battery For Smoke Alarm
Jiangmen Hongli Energy Co.ltd , https://www.honglienergy.com