An electronic faucet having a spout, a electronically actuated valve, and a microprocessor-based control circuit for operating the valve to enable or disable water flow through the spout. The microprocessor has a control program which includes a calibration routine that uses an infra-red sensor to determine...http://www.google.es/patents/US6273394?utm_source=gb-gplus-sharePatente US6273394 - Electronic faucet
