Source code PI-3

[Taktyk]

Hi,

Why do not you increase the resolution, Carl? For greater sensitivity..?

This is only average samples?

Listing:


tmp += CurrentSample; // tmp is effectively a 12-bit value sampleCount++; if(sampleCount == 4) // If we've accumulated 4 samples, then store { sampleArray[sampleIndex] = tmp>>2; // Store the current sample - 10 bits

[Carl-NC]

The PIC has a built-in 10-bit ADC so for simplicity that's what I used. A higher-res external ADC would improve sensitivity but would make a more difficult project.

[Taktyk]

10 bit resolution voltage is 5 mV. C code: sampleArray[sampleIndex] = tmp>>2; // Store the current sample - 10 bits -it is only averaging 4 samples.

I Think... By using a method called ‘Oversampling and Decimation’ higher resolution might be achieved.. Here the 11 bits.. C code: sampleArray[sampleIndex] = tmp>>1; // Store the current sample - 11 bits - voltage resolution 2,5mV

From 4 to 16 samples - 12 bits.C code: sampleArray[sampleIndex] = tmp>>2; // Store the current sample - 12 bits - voltage resolution 1,22mV

I continue to make changes..

[Carl-NC]

Yes, averaging more samples can help, but also slows down the target response.

[bernte_one]

hello taktyk,

did you bild pi-3 already, can you help me if i have questions?

[Taktyk]

Yes of course

[bernte_one]

only some components to collect and i can finish pi-3, i hope it works this time

[bernte_one]

ok i have finished pi-3, it is a waste of components and time Sound is horrible and sensivity also

[bernte_one]

next weeks i will order a hantek table dso i hope i can optimize the pi circuits a bit
i am not lucky with them i hoped they have more potential