Inertial Navigation System

[CyberWolf_22]

Hi I was thinking about prototyping an Inertial Navigation System and was wondering what gyros and accelerometers team 190 used last year in there's and were they obtained them.

[Frank(Aflak)]

we are doing the same thing. According to our programmer, the program is ready, we just need some accelerometers.

I check small parts, and msc, but they are both more mechanically oriented.

[UlTiMaTeP]

I know they use them in cars for measuring G-Force, so they might be with automotive things

[Kevin Watson]

Analog Devices makes some pretty cool Accelerometers and Gyroscopes.

[Venkatesh]

Blarg... a flashback from early last season...


I built an inertia navigation system, based around a Basic Stamp 2. I have the schematics and code someplace, AIM me if u want them (ExtrudedAluminiu)

The system I built was based around a three axis accelerometer and three gyros. The acellerometer and gyro outputs were integrated by op-amps (analog circuits!!) and then fed to an ADC. The BS2 would select the data it wanted, and it would read it in. It worked remarkable well on my desk. =)

I also placed a 1-axis accelerometer, and ADC, and a BS2 into a model rocket. The BS2 was supposed to read the ADC and then store the output in its onchip EEPROM. However when i tested it, the BS2 couldn't keep up with the incoming data, and I missed large enough chunks that the height that i obtained was useless.

Btw, all the accellerometers i used were from Analog Devices. They work great for projects and FIRST things.

[Rpifirst]

I know that 190 was going to write a white paper or rather we thought we should. Tommorow I will ask the lead designer of the INS about it for you. I know however that the we used a prefab mini controller along with some two axis accelerometers that I believe are normally sold in mass quanities. Also I know that it took a team of 4-5 the six week's to do altogether.

[catlin101]

I did something kind of like that last year, except I did this:

I had a gyro chip, and then rotary encoders on the wheels. I was worried about using an accelerometer, because in order to get position, you need to integrate them twice. So, once the velocity gets off by a little bit, your position will start "drifting." I never actually tried using an accelerometer; maybe this isn't as big a problem as I thought.

[Andy Baker]

You may want to check with teams 111 and 308 also.

Andy B.

[Rpifirst]

I talked to rick petty the lead designer of the ins and he said soon he will have a full website on the ins we used in 2k3 when he has it finished ill post it here.

[Eric O]

You may want to check out the StangPS presentation that they have on their site if you have not checked it out yet. Here is a link to the original thread about StangPS:

http://www.chiefdelphi.com/forums/sh...hlight=stangps

Eric

[CyberWolf_22]

Weren't we only supposed to use additional electronics form digi-key or future FAI?

[Chris Hibner]

Originally posted by CyberWolf_22
Weren't we only supposed to use additional electronics form digi-key or future FAI?

Yes. Digikey sells nice microcontrollers and Future sells angular rate sensors and accelerometers by Analog Devices and other manufacturers. Between these two sources, you can get everything you need to make a nice navigation system.

[Rpifirst]

We bought both the accelerometers and microcontrolers form places other than future and digikey. I'm not really sure about the gyro it could be the one from the kit.

[CyberWolf_22]

Originally Posted by Rpifirst

We bought both the accelerometers and microcontrolers form places other than future and digikey. I'm not really sure about the gyro it could be the one from the kit.

Then wouldn't your robot be considered illegal.

[Rickertsen2]

Originally Posted by Kevin Watson

Analog Devices makes some pretty cool Accelerometers and Gyroscopes.

I have some ADXL2002s (i think) lying around somewhere. They are pretty nifty and extremely sensitive.

Hint Hint: engineering samples