Help with MMA7260 Accelerometer

Crack

Hey everyone I only recently got my hands on a propeller demo board after playing around with the arduino for quite awhile.

My problem: I can't find a way to extract the X and Y data from the MMA7260 accelerometer.

The closest I have to come to an example for this is from here: https://sites.google.com/site/parallaxinretailstores/home/memsic-2125-dual-axis-accelerometer however using this with the accelerometer I have does not show values which appear to be correct and the values don't always update when I'm moving the accelerometer.

The Arduino equivalent:

int sensorValue = analogRead(A7);

I could then use sensorValue to do whatever I like. Eg. Print to serial terminal.

Any help with this would me much appreciated I have spent hours searching for examples and following spin tutorials.

Duane Degn

I think you need three analog to digital channels. Either using a ADC chip or delta-sigma ADC with passives close to the Prop's pins.

I beleive the MMA7260 outputs analog voltages.

Apparently there can be problems with its calibration.

kwinn

The accelerometer chip you are using has 3 voltage outputs that are proportional to the force and requires an adc to convert that to a binary value.

The memsic accelerometer outputs a pulse with a width that is proportional to the force for each of the 2 axis.

What if any adc are you using?

Crack

Thanks for the reply.

I'll look into ADC when I get back from class.

I saw that article about the calibration problem, thanks for the heads up.

kwinn wrote: »

The accelerometer chip you are using has 3 voltage outputs that are proportional to the force and requires an adc to convert that to a binary value.

The memsic accelerometer outputs a pulse with a width that is proportional to the force for each of the 2 axis.

What if any adc are you using?

I don't think I was using any ADC so that seems to be my problem.