Legal Removal Request

Post: Hi Adrian The Bitscope shouldn't make any difference as it should be getting its power from the 5V rail while the ADC DAC Pi is powered through the 3.3V rail. Can you check the voltage on the 3.3V pin on the ADC DAC Pi to make sure it is 3.3V and there isn't a fault with the Raspberry Pi's 3.3V regulator? With the comment I made about setting the voltage to 3.2V I was assuming you were using the set_dac_voltage() function which converts the voltage to a raw value but as you are using set_dac_raw() to set the voltage directly that wouldn't apply in your case. Try running the code below, it should set the output on the DAC channel 1 to a constant 3.3V. [code] #include "ABE_ADCDACPi.h" int main(int argc, char **argv){ // needed to print to the command line setvbuf (stdout, NULL, _IONBF, 0); if (open_dac() != 1){ // open the DAC spi channel exit(1); // if the SPI bus fails to open exit the program } // set the dac gain to 2 // which will give a voltage range of 0 to 3.3V set_dac_gain(2); set_dac_raw(4095, 1); close_dac(); return (0); }[/code] If the output voltage is lower than the voltage on your 3.3V power rail then there could be a fault with the ADC DAC Pi, in which case I will send you a replacement.