I am trying with Mega2560 and ADS1232 A/D chip and all connected to to my laptop. when the power supply adapter is connect, signals (in serial plotter) are noisy & biased! when i touche the GND of board or GND of USB cable with my hand, noises & biases are removed!
*** GND of board & A/D chip & power supply are connected too.
please help me!!!!!!