Wiring The accelorometer
 

well funny story, at my robo shop i wired acccelorometers, turns out i wired accelorometers that were a year old and was only 2 axis o.O.... Soo inturn we located the latest accelorometer and its 3 axis.. so i did some homework trying to understand exactly how to wire it but proved to be unseccessful.
can anybody help me with wiring pwm cables to the accelorometer? thank you

Re: Wiring The accelorometer
 

Have you looked at the sensor manual? http://usfirst.org/roboticsprograms/...nt.aspx?id=452

Re: Wiring The accelorometer
 

yes i have, and i dont quiet understand it. i mean i know the ports... but exactly how, i am a little confused at the moment

Re: Wiring The accelorometer
 

If you're using LabVIEW, there is an example showing how to use the accelerometer board with its I2C connection. I haven't looked closely at the C++ or Java environments to see what sort of accelerometer examples they have.

Are those directions exact enough, or do you need more information?

Re: Wiring The accelorometer
 

i still quiet don't get it... i read the instructions but still don't understand it... i hate to be a noob but i am wiring it with pwm cable..and using all 3 axis... can someone just tell me what color on the pwm goes to what port on the accelerometer... it would be much appreciated =D

Re: Wiring The accelorometer
 

If you're using PWM cable, you'll need to add a fourth wire to use I2C. The number of axes don't matter (for the wiring) and colors don't matter (though it may help to have black wire on 0V and red wire on 5V) - you just need to make sure the wires connect the same pins at each end. That is, the 5V pin on the accelerometer connects to the 5V pin on the digital side car, SDA to SDA, SCL to SCL, and 0V to 0V. Make sure you don't reverse one of the connectors and connect 5V to 0V or vice versa.

Re: Wiring The accelorometer
 

Well, that's the trouble.
It's not a PWM cable; it has 4 connections.
5v, GND, SCL, and SDA
You can find the 4-pin header on the digital sidecar, right next to that female RJ-14 (modified phone jack).
However, beware that on the accelerometer, they are in a different order than on the digital sidecar.
You must solder a pigtail or header to the accelerometer.

Re: Wiring The accelorometer
 

The other way to wire the accelerometer might be easier if you just have the three wire pwm cables.

Looking at the 8 J4 connections, wire two pwm cables to the bottom 6. Plug the first one into the digital IO port 1 like a normal connection. Plug the second one across the signal pins of ports 2 , 3, and 4. This is slightly different from the doc quoted above which says to use the power pins located just below the port 1 pins. Not sure why it would matter.

Then go run the ADXL345 SPI Accelerometer example program and verify that you have everything wired correctly. It seemed to work for us today.

Re: Wiring The accelorometer
 

Just a note, but keep in mind that this is a digital accelerometer and not an analog accelerometer. Years before they have given us analog ones the digital ones are a little more interesting to wire.

We are using last year's 3-axis analog accelerometer for ease of use.