I used this technique for my solar charger circuit - not knowing about the application note. I wanted to decide wheter I can calculate with the analog input or not. If the supply voltage is below the 5V, there is no enough light ( insolation, radiation ). So the controller start to work if the working condition are above the minimum voltage level. The controller is 16F1507 a very cheap device. Tell the true I had to make a compromised decision because this technique with FVR module isn't stable for me according the PWM level of the output stage. I set a resonable level for the cicuit which is far from the theoretical value. I did not have time to analyse this problem more deep. So this is at this stage for me. 2013/5/19 Vicent Colomar Prats > Very interesting, thank you. > > Don't know why dsPICs have not this functionality. > > > 2013/5/19 David > > > All, > > > > I have written a simple article which might be of use to some people, > > measuring the PIC Vdd using no external components. > > > > This builds on an older Microchip application note designed for outdate= d > > parts, so it isn't a new idea. However it works well enough for simple > > battery monitoring and can be added to any project on a supported PIC. > > > > You can find it here: http://edeca.net/wp/electronics/measurin > > g-pic-vdd-with-no-external-components-using-the-fvr/ > > > > Happy to take comments or corrections. > > > > David > > -- > > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > > View/change your membership options at > > http://mailman.mit.edu/mailman/listinfo/piclist > > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 ~~~~~~~~~~~~~~~~ http://galzsolt.zzl.org --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .