Hey there.
TomGeorge:
Hi,
Can you post pictures of your project with the sensors connected and mounted in the car please?
TomGeorge:
Can you post a proper circuit diagram, showing ALL your connections to sensors and batteries?
Label the connections to your components.
The circuit you supplied did not show any needed information.
TomGeorge:
Have you got any bypass capacitors on the motor and have you checked your wiring.
Electrical noise from the motor can easily get into the sensor circuitry.
I'm sorry, I don't know what this is but with the picture of the car with its sensors I posted just before you should be able to figure it out.
TomGeorge:
Have you kept the motor power wires away from the sensors and their wiring?
The sensors don't get their energy/power from the same batteries as the car. However, the sensors are wired to the motor and the batteries of the car (seems kind of logic). I don't know if I answered your question.
TomGeorge:
Can you post links to spec/data of your sensors, are they just the IC, or are they mounted on a breakout board.
A link for Voltage Sensor-Phidgets 1135 : 1135 User Guide - Phidgets Support
For Current Sensor -MR003-006.1 : http://www.microbot.it/documents/mr003-006_datasheet.pdf
TomGeorge:
Both sensors work with 3.3V, but if mounted on breakout PCBs there may be a voltage regulator included.
I mounted both sensors with 5V. I hope it's still good though.
Did you see the pictures of what I got on Arduino when accelerating the car? Do you think the values of current and voltage are good?
I don't measure acceleration and Current/Voltage at the same time. So in the pictures I showed before was the mounting when I should measure Current/Voltage.
Here is the mounting when I measure acceleration :
We can't see that much, but the accelerometer is on the front, scotched. It is linked to the arduino card by 3 wires : a black one for the GND, a blue one for the output and a white one, the 5V.