Accelerometer

Forum 2005-2010 (read only) Hardware Interfacing
1

Hi,

I want to use an ardiono BT to get the readings from a 3-axis accelerometer. The output of the accelerometer depends on the input voltage; the output voltage depends on the acceleration that is produced as a fraction of the input voltage.

So, for accurate readings I should capture both the acceleration values as well as the input voltage. In my setup I will use the same battery to power the arduino board and the accelerometer.

My question is if it is ok to take the battery input and plug it into the analog in pin for an arduino? My guess is that the analog pins have high input resistors that should prevent the pin from burning up. Is that assumption correct?

Also, I am using the accelerometers to get the tilt along the three axes. Is there an advantage in using a tilt sensors (except I could not find a three axis tilt sensor)? Any reference on an easy conversion from accelerometer readings to tilt angles would be very helpful.

regards,
A

2

My question is if it is ok to take the battery input and plug it into the analog in pin for an arduino?

As long as the battery voltage does not exceed the Arduino's supply voltage, yes.

Also, I am using the accelerometers to get the tilt along the three axes. Is there an advantage in using a tilt sensors (except I could not find a three axis tilt sensor)? Any reference on an easy conversion from accelerometer readings to tilt angles would be very helpful.

Tilt sensor often are accelerometers. Be aware that small angles of tilt can be lost in noise.