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R6,R7,D7 together detect FS1 blown. Detect incoming AC pulse in software.
Remaining components detect Loading. Designed for 40W approx. Change R2 to suit your application to give you less than 1v at your desired load. Use ADC or Comparator to measure if device is ON, OFF or sideways. Do not design above 2v input to PIC as protection Zener will start to conduct and distort measurement.
Caution, PICs 0v rail is common with supply Neutral.
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Thank you Melanie.
Now I couple that with a transformer-less PSU and an opto-coupler, and I have an isolated sensor.
Just one question. Is that meant to be GP0 or VSS?
Last edited by Freman; - 12th June 2008 at 23:21.
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In this example the junction of R3/R4 is connected to GP0 - it doesn't have to be - it can be any PIC pin with ADC or Comparator analog input.
VSS and VDD are shown not connected - it is assumed you will know what to do with them. VSS would be connected to the Neutral (0v) line - that's the SUPPLY Neutral and NOT the LOAD Netural. VDD is connected to your +5v Supply which if derived from a transformerless source is ideal (see elsewhere on this forum for examples of that).
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