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TC1 lcr-meter transistor-tester fix

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madires:
I've checked the IR protocol detection with tons of remote controls and different Transistortesters over the years. It's working fine. However, your tester seems to have a clock issue. The start pulse/pause periods of 172 and 85 (* 50 µs) point to the NEC protocol which is 9 ms (179 * 50 µs) and 4.5 ms (89 * 50 µs). The protocol detection allows some margin for the timing, but the offset is too large in this case. The MCU clock looks to be a bit slow. Have you set the ATmega's fuse bits to use the external quartz crystal instead of the internal RC oscillator? You can ignore the compiler warnings.

SA:
Low fuse 0xF7
High fuse 0xD9
Extend fuse 0xFC

Atmega328p
is it right??

madires:
That looks right. Still, the MCU clock is the most probable cause, especially since none of your remote controls were detected. The timing of a single remote control might be off, but not all.

SA:
After twiking for a long time I am still unable to make the the IR decoder to work properly. But that is not a big problem. Everything else works fine. But when no component is tested it shows Parasitic capacitance ranges from pf to 100uf even after self test and adjustment. Is that also for the MCU clock issue??

madires:
No, that could be a power supply issue (unstable Vcc).

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