ADXRS300EB Rate Gyro

[rmeenaks]

Hi,

I am now the proud owner of an ADXRS300EB and I want to hook this beauty up to the lego mindstorms sensor port. I already own the following interface connector:

http://www.techno-stuff.com/3wire.htm

so I think it should be pretty easy. I was thinking about connecting it following way:

AGND to Ground
AVCC to +5V
Rate Out to Signal

would this cause any problems? The interface produces about 6mA which should? be enough to drive the sensor. Am I correct? I dont want to damage the sensor since it is a bit expensive...

Any help is much appreciated. I really need to get this going, but I am not too electronic savy

Cheers,

Ram

[dez250]

please dont double post the same thread in more then one spot.

[rmeenaks]

Sorry, this is my first time on this Forum


Ram

[coreyjon]

It's alright that you double posted, as a newer member to the forum, I think people will understand that you where just unsure which area was the correct place to post, and you just wanted to get the info, no harm, no foul. Mike, loosen up a bit will you.

Also, the way your planning on wiring it sounds right, I mean it makes sense.

power to power, ground to ground, data to data.

The more and more I see what you can do with lego mindstorms, the more and more I want to go out and buy a kit, and a bunch of parts and just let loose.

[rmeenaks]

Thanks. I wasnt sure which forum to post it until I found the electrical forum. It seems that I can hook it up like this as well:

1) Connect +5V to pin 1 (AVCC)
2) Connect signal to pin 2 (RATEOUT)
3) Connect ground to pin 8 (AGND)
4) Connect +5 to pin 13 (PDD)
5) Connect ground to pin 12 (PGND)

I found this out which I did a search through the forums
Should of done that first. Now the quesion is is 6mA enough (or too much) to drive the sensor???

Cheers ,

Ram

[Joe Ross]

Originally Posted by rmeenaks

Now the quesion is is 6mA enough (or too much) to drive the sensor???

From the data sheet:

POWER SUPPLY             min typ  max
Operating Voltage Range 4.75 5.00 5.25 V
Quiescent Supply Current      6.0 8.0 mA

[KenWittlief]

it cant be too much- the sensor will only draw what it needs - sounds like it should work - let us know what you end up doing with this - I think I have a mindstorm set lying around in the basement somewhere

[rmeenaks]

Hi,

Cool! Now off to my bench to get this thing working
I have lots of uses for this as I currently have an accelerometer as well (ADXL202E) hooked up to the mindstorms. I am planning on creating a two-wheeled balancing robot similar to LegWay, but with the ADXRS300/ADXL202 and a bit of Kalman filtering. This is just a proof-of-concept design to see if this combo works. This should be a very interesting project. This leaves me with more room to add yet another sensor to the mixture (like the Sharp distance sensor or a light sensor). I let you guys know when I finish this...

Thanks for all the help,

Ram

[dez250]

Originally Posted by rmeenaks

Hi,

Cool! Now off to my bench to get this thing working
I have lots of uses for this as I currently have an accelerometer as well (ADXL202E) hooked up to the mindstorms. I am planning on creating a two-wheeled balancing robot similar to LegWay, but with the ADXRS300/ADXL202 and a bit of Kalman filtering. This is just a proof-of-concept design to see if this combo works. This should be a very interesting project. This leaves me with more room to add yet another sensor to the mixture (like the Sharp distance sensor or a light sensor). I let you guys know when I finish this...

Thanks for all the help,

Ram

Hey Ram , good luck it seems Joe and Ken have set you on the right path, keep us updated on your pojects and if you have any other questions, were here to help. Also what mindstorms kit are you using this on, i havent seemed to find a good mindstorms kit that i could use to test rotational and yaw rate sensors on?

[rmeenaks]

Originally Posted by dez250

Hey Ram , good luck it seems Joe and Ken have set you on the right path, keep us updated on your pojects and if you have any other questions, were here to help. Also what mindstorms kit are you using this on, i havent seemed to find a good mindstorms kit that i could use to test rotational and yaw rate sensors on?

All the mindstorm kits (the RCX that is) are pretty much the same. They have versions 1.0 (which has an AC adapter + Batteries), RCX 1.5 (removed the AC adapter plug ), and RCX 2.0 (updated firmware and USB-based but similar to 1.5). All are compatible with each other. I have both a 1.5 and a 1.0. I am testing this on a 1.0-based RCX brick. I will definitely let you guys know how this goes. Thanks for all the help. I am really glad I found this site. A lot of cool and interesting stuff here....

Cheers,

Ram

[Mark McLeod]

Originally Posted by rmeenaks

I am really glad I found this site. A lot of cool and interesting stuff here....

Cheers,

Ram

You should try out the Hauppauge FIRST Robotics club too.
We do this "cool and interesting stuff."

[rmeenaks]

Hi,

Thanks to all. I now have a prototype and it is working like a champ!
Here is a picture of the interface:

[rmeenaks]

Originally Posted by rmeenaks

Hi,

Thanks to all. I now have a prototype and it is working like a champ!
Here is a picture of the interface:

Forgot to mention that now I am off to build the two-wheeled balancing robot using lego mindstorms. Yipeeee!!!


Cheers,

Ram

[Ryan M.]

Originally Posted by rmeenaks

Forgot to mention that now I am off to build the two-wheeled balancing robot using lego mindstorms. Yipeeee!!!


Cheers,

Ram

That'll be fun.

Out of curiousity, do you use the default firmware, or an alternative like Lejos, BrickOS (former LegOS), PBFORTH (ick.), etc?

[rmeenaks]

Originally Posted by Texan

That'll be fun.

Out of curiousity, do you use the default firmware, or an alternative like Lejos, BrickOS (former LegOS), PBFORTH (ick.), etc?

Currently using the default firmware with NQC just for testing the sensor. I will eventually use BrickOS since the response rate is alot faster. Doubt you can even do this with the default firmware/NQC. Havent tried Lejos nor PBForth. I'll post the my progress in the forums.....

Cheers,

Ram