SparkFun Forums 

Where electronics enthusiasts find answers.

General project discussion / help
Did you make a robotic coffee pot which implements HTCPCP and decafs unauthorized users? Show it off here!
By leotns1
#166002
He have an doubt about the Accelerometer MMA7361, we make an graduation project to the college , here a brief description:

We are developing a virtual percussion instrument that was based on the electronic solutions specialist project, from Israel, Maayan Midgal. Unlike of what he developed, the project will be done by replacing the wires for Wireless technology using Xbee.

The sounds will be reproduced from the movements detection performed in stick and pedal using the Accelerometer MMA7361, this data will be transferred to the central (Arduino Nano) that will forward to an audio player, in our case a computer.

Our doubt is what are the data that accelerometer shows values from 0 to 1023, on the three axis. This the acceleration?
What are these values?

Thanks

Regards

Leonardo Santana
By Mee_n_Mac
#166081
leotns1 wrote: Our doubt is what are the data that accelerometer shows values from 0 to 1023, on the three axis. This the acceleration?
What are these values?
The Nano is a 5v device. The MMA7361 is nominally 3.3v. How are you connecting them ? You should only ever measure 3.3v max at the Nano if you don't do something to rescale the inputs.

If I assume that some rescaling is done such that 3.3v = 1023 counts from the ADC then the answer depends on the range selected for the MMA7361.

For the 1.5G range: 0 = -1.5G, 1023 = +1.5G
For the 6G range: 0 = -6G, 1023 = +6G
For either range 511 or 512 = 0G

1G = 9.8065 m/sec/sec