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Yes I don't technically need to check, but as I haven't implemented the voltage clipper yet, I use it to prevent my PIC from hanging when the signal goes outside the range.

Yes I forgot to mention ...

You wouldn't use current_packet at all.

memset(sendData, 0x00, 64);

You want to zero 64 bytes not 63. In C, the name of an array is the address of it's first element. So 'sendData' is equivalent ...

Then as another general comment, this:

for(n=currentPacket ; n<64 ; n++){
sendData[n] = 0;
}

is slower than just using memset.

Al ...

The ADC only allows it's Vin, to go between it's reference voltages. In your case Vdd and an external Vref. The signal needs to be limited externally to this range. You need to think about your extern ...

Hello. I've constructed a PCB for amplification and filtering from a Photopletysmograph. Basically, a Transimpedance Amp, a 1.5 kHz Band Pass Filter, an IRed Led Modulated at 1.5 kHz and a Photodiode. ...