Equipment: Arduino UNO 3, Adafruit SD shield
Hi,
This is my first Arduino project and I am bit confused with the results I am getting.
I want to read the voltage from a transducer that is powered by the Arduino.
The transducer output is connected to Analog Pin 2.
My code is pretty simple:
analogread(A2) x 5/1023
However the reading I have is very different from what my multimeter is giving me.
Multimeter: -0.29V
Arduino: 0.00V
Is there something wrong with the grounding maybe?
Note:
- the Arduino is powered by laptop USB
- the transducer is powered by Arduino 5V and step up transformer
Many thanks in advance for your help.
Best,
15 posts - 6 participants