8-bit Microcontrollers中的主题 Re: problem on reading accleration using MMA7260

problem on reading accleration using MMA7260

hidashi — Wed, 22 Aug 2007 15:18:59 GMT

i just bought MMA7260. I trying to read acceleration reading using it. But i found that the reading keep constant , which is about 240 for all the 3-axes no matter how i move the accelerometer?

Can anyone share with me what would be the problem ?

thx in advance.

Re: problem on reading accleration using MMA7260

mke_et — Thu, 23 Aug 2007 05:40:04 GMT

Divide and conquer.

Are you sure your part is working?

First off, check your outputs. Hook up the part and put a voltmeter on each axis output. Turn the part over so the axis you are measuring goes in and out of alignment with gravity (ie is aligned up and down) and see if that output acts as expected. Remember, it should be 1g reading to -1g as you turn it over. Then check the other axis.

Check your inputs. Are you trying to do A/D on the chip? Hook up a potentiometer and make sure you input routines work.

It's not rocket science.

Uh oh, maybe it is! Well, at least ballistic missle science!

Re: problem on reading accleration using MMA7260

Witztronics — Thu, 23 Aug 2007 07:29:23 GMT

Also, don't forget about the /sleep pin. There is not an internal pull-up, so you will need to add an external one. Without it, you will get no outputs.

Witztronics