I need Help with Triple Axis Accelerometer Breakout - MMA7361 code

Xavier

Hi I'm new in this and I have basic stamps and a Triple Axis Accelerometer - MMA7361.

I need the code or routine to use the MMA7361 with basic stamp.

The Arduino code is:

http://www.geeetech.com/wiki/index.php/MMA7361_Triple_Axis_Accelerometer_Breakout
http://arduino.cc/forum/index.php/topic,38132.0.html

It would be great if someone could help. Thanks.

davejames

Xavier - welcome to the Forum.

Which Basic Stamp do you have?

Publison

Xavier wrote: »

Hi I'm new in this and I have basic stamps and a Triple Axis Accelerometer - MMA7361.

I need the code or routine to use the MMA7361 with basic stamp.

The Arduino code is:

http://www.geeetech.com/wiki/index.php/MMA7361_Triple_Axis_Accelerometer_Breakout
http://arduino.cc/forum/index.php/topic,38132.0.html

It would be great if someone could help. Thanks.

That particular unit has Analog outputs on each axis. The Basic Stamp does not have any Analog inputs as the Arduino has. You would have to add three channels of A/D on the hardware side before writing software for the Basic Stamp.

Welcome to the forums!

Some reading for Stamp ADC:

http://www.parallax.com/Portals/0/Downloads/docs/cols/nv/vol2/col/nv57.pdf

http://www.parallax.com/Store/Components/AllIntegratedCircuits/tabid/154/CategoryID/31/List/0/SortField/0/Level/a/ProductID/574/Default.aspx

Xavier

Hi,

I have BASIC Stamp 2 with Carrier Board and a basic stamp 2sx.
I already have the A/D with the Basic Stamp 2.

How can I join the A/D Basic Stamp 2 code with the Arduino MMA7361 code to finally have
a Basic Stamp 2 code.

Thanks, any help would be usefull.

Mike Green

As Dave mentioned, the Stamps do not have built-in analog to digital converters. It's possible to use the RCTIME statement to make a crude analog to digital converter, but it's slow and has limited accuracy. You're better off using something like the MCP3204 (see Dave's 2nd link) and Dave furnished a copy of the sample code for that. Either the BS2 or BS2sx will work with it. The BS2sx is faster and has more memory available.

Leon

Instead of adding an ADC it would be more sensible to use an accelerometer with a digital interface, such as the MMA8452Q. They are available on a BO board from SparkFun.

Xavier

Publison wrote: »

That particular unit has Analog outputs on each axis. The Basic Stamp does not have any Analog inputs as the Arduino has. You would have to add three channels of A/D on the hardware side before writing software for the Basic Stamp.

Welcome to the forums!

Some reading for Stamp ADC:

http://www.parallax.com/Portals/0/Downloads/docs/cols/nv/vol2/col/nv57.pdf

http://www.parallax.com/Store/Components/AllIntegratedCircuits/tabid/154/CategoryID/31/List/0/SortField/0/Level/a/ProductID/574/Default.aspx

Hi,

I couldn't get the A/D you told me, I could only get 2 of these:

http://www.parallax.com/StoreSearchResults/tabid/768/List/0/SortField/4/ProductID/575/Default.aspx?txtSearch=3202+B

How can I get It work, does the demo code you put works with these???
and How does it go in the board with the MMA7361???[h=2][/h]

Xavier

I have problems with the ADC MCP3202 and MMA7361 for BS2sx I get these values and it gets stuck in the same values and when I move the MMA7361 it doesn't change at all compare with the Arduino see the read.txt. I only have connect the "X" and "Y" to make test of it and I tried several things but it didn't work.

If there is someone who could possibly help me I would like to get the raw value and mV like in the arduino, please.
Thanks.

Mike Green

How do you have things connected (be specific)? What happens when you try the program you attached to Post #7 (give details)? The original demo program works with the BS2. It looks like you modified it correctly for the BS2sx, so it should have worked with a single MCP3202.

Xavier

I have connected properly the ADC and in the channels 0 and 1 are "X" and "Y" and in the MMA7361 I have connected the 5V, GND,"X","Y", and Gselect, I only have these connected.

And what I don't have connect is the "Z", 0G, Sleep, and Selftest pin from the MMA7361.