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-voltage fluctuates between 5.05 and 5.75 That's very wrong. A 7805 should be able to keep the voltage stable within 0.1V. I'm not surprised the PIC doesn't operate well with such an unstable power supply. Maybe your 7805 is broken, or not soldered correctly. Also check C1 and C2. Hello Schelte, I ...

Hello, I had the exact same problem. This may be due to the fact that a low power (L = 100mA) version of the 7805 was shipped with the kit that I ordered from http://www.opentherm-gateway.com. After replacing it with a regular 7805 (1A) everything works as expected. That said, it is supposedly bad p...