I purchased LTC1859 shield and evaluating with Arduino Uno board. No voltage source is connected to the ADC shield. I am running ExtendedADCShieldDemo.ino script and I am watching serial monitor. I see the following readngs:
2.58217 0.00000 0.00000 2.58248 2.58309 -0.00122
The three numbers that are close to “0.0000” makes sense because no voltage source is connected. But I am not sure why I am seeing close to “2.582” on three other channels.
I connected voltage source and tested the three channels that show “0.000” and these channels read the voltages very accurate.
Can you help understand what could be causing the issue and I am seeing close to “2.582” when nothing is connected on those channels?