Infrared automatic faucet schematic

Published:2011/3/21 1:27:00 Author:Joan | Keyword: Infrared faucet, automatic faucet, automatic faucet | From:SeekIC

How it works:The circuit is shownas the figure. IC1 and W1, C1 and other components compose a 30 ~ 50KHz frequency pulse oscillator. It drives the infrared light-emitting diode D1 to send modulated infrared light. When someone close to the faucet for washing hands or hold water, a part of the the infrared ray emitted by the D1 which reflected back by the human body part is received by BG and then is amplified by op amp IC2 and then input to pin 3 of the audio decoder LM567. After decoding and dentifying it, the IC3 makes pin 8 output low. Relay J pulls in, normally open contact point JH connects to the solenoid valve power. Electromagnetic valve is opened, the faucet water automatically. When the human body leaves the faucet, BG lost infrared signal, then the circuit returns to the general state of waiting for work. Debug: Cover up D1 and BG by iron sheet. Tunning W1, W3 can make the infrared transmitter and receiver of the same frequency. When the human body is close to the faucet, the solenoid valve can reliably act. Regulating W2 resistance can change the D1 emission current, then the circuit can control the effective action distance when the human body close to the faucet(ie, sensitivity).



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Sensor_Circuit/Infrared_automatic_faucet_schematic.html

Print this Page | Comments | Reading(3)