Electrical – HX711 ADC Simultaneous data reading from both channels

I now have this working. ADC10 part is now similar to TI's samples.

This is the code that can read successfully from 4 pins simultaneously:

unsigned int res[5]; //for holding the conversion results
void main (void)
{ 

  //code for connecting to AP

  //reading voltage
  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
  ADC10CTL1 = INCH_4 + CONSEQ_1;            // A4/A3/A2/A1/A0, once multi channel
  ADC10CTL0 = REF2_5V + ADC10SHT_2 + MSC+ REFON + ADC10ON + ADC10IE; //2.5 reference voltage
  ADC10AE0 = 0x1F;                          // P2.0,1,2,3,4 ADC option select
  ADC10DTC1 = 0x5;                         // 5 conversions
  P1DIR |= 0x01;                            // Set P1.0 output

  for (;;)
  {
    P1OUT |= 0x01;                          // Set P1.0 LED on
    ADC10CTL0 &= ~ENC;
    while (ADC10CTL1 & BUSY);               // Wait if ADC10 core is active
    ADC10SA = (int)res;                        // Data buffer start
    ADC10CTL0 |= ENC + ADC10SC;             // Sampling and conversion ready
    __bis_SR_register(CPUOFF + GIE);        // LPM0, ADC10_ISR will force exit
    P1OUT &= ~0x01;                         // Clear P1.0 LED off
  }

}

#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR(void)
{
    //code from reading from res and sending it to AP
  __bic_SR_register_on_exit(CPUOFF);        // Clear CPUOFF bit from 0(SR)
}

Thanks for the help!

This is a very good idea. The BioTac tactile sensors from Syntouch do this very same thing. They have a pressure sensor inside them which captures both the low frequency part of the signal at about 50 sps, and the high frequency components amplified and sampled at 2000 sps. This works beautifully.

However, I don't know if you can actually combine these two signals to create a higher resolution, I.E. more bits. You may be able to with some clever signal processing, but it wouldn't be trivial.

Another way to increase the ADC resolution is by oversampling. If you take 16 12-bit samples (and assuming there's at least one LSB of noise) then you really have increased the effective resolution.