How to get electronically controlled multiple individual voltage outputs from a single source

adcdacmicrocontroller

I am planning to make a digital control board which can draw a DC Voltage of the order of say 12-15 Volt, from a single source and give multiple number ( approximate #100 ) of voltage lines of different values range from 0.1 to say 6/7 Volt with a fine resolution ( it is possible to differentiate between two output lines on the order of say mV). Voltages appeared to output lines should be controlled electronically.

So how to design this board ? What type of programming needs ?

Best Answer

You can try to use a microcontroller with PWM output. Filter the PWM with high RC. Use an op-amp to buffer the output and give a gain of say 10x.

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ADS1256 from TI has eight single-ended 24bit channels with high-impedance input buffer and PGA. OpenEXG project has PIC code to interface it (they use two channel version ADS1255, but it should be the same).

If you want differential inputs, then there is ADS1298, with 8 channels, PGAs and A/Ds, internal reference, plus ECG/EEG circuitry which you can ignore. I am not sure you can find any example code for this one, though.

If you are looking for resolution, then precise, low noise reference is a must.

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int can only be 0-255

That's not correct. In the C programming language, an int is always at least 16 bits wide, even on 8-bit micros. A char is 8 bits wide.

But when using inttypes.h, I strongly recommend using the explicit types like uint8_t,int16_t or uint32_t.

Your real error is using _delay_ms() with a variable parameter. This is not allowed, as it is a macro involving floating point calculations - at least in avr gcc. You are supposed to use something like this:

void DelayMs(int delay) {
  while(delay--) _delay_ms(1);
}

Best Answer

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