This is a multi-part message in MIME format. ------=_NextPart_000_0031_01C2FF3A.6C2511F0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: 7bit > I am running the PIC on 5V power supply (using the LM7805 regulator). I > want to be able to detect the input voltage of the LM7805 when it falls > down to around 6V. I don't have any ADC port left on the > microcontroller. All I have is a digital input. My goal is to build > the simpliest and cheapest circuit possible. Maybe with one transistor > and few resistors. Do you have any idea? Thank you in advance! Here's one way. -- http://www.piclist.com#nomail Going offline? 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