RoboSavvy Forum

Triple Axis Accelerometer

2007-02-19T23:04:01+01:00

this is what I've got running

Code:: robot_voltage: ' [ 10 x Value / 256 = Voltage] DIM v AS BYTE v = AD(6) IF v <153> 250 THEN RETURN IF x <30> 200 THEN GOTO tilt_high RETURN tilt_low: x = AD(2) 'IF x < 30 THEN GOTO forward_standup IF x < 30 THEN GOTO backward_standup RETURN tilt_high: x = AD(2) 'IF x > 200 THEN GOTO backward_standup IF x > 200 THEN GOTO forward_standup RETURN '================================================

this is only the Hitec tilt sensor and the v monitor w/two 51Kohm resistors at ad(2), ad(6) I still haven't got the two axis running yet. I thought that using x & y as byte would work but RN-! doesn't react to a fall with it. The dim A as byte is used for the remocon I believe I wired the two axis in and took v. readings and they are lower than the RN-1 tilt sensors, subpilot uses a different variable and that might take that into account. I hope he'll come back to this and explain what he did.

Statistics: Posted by engineer — Mon Feb 19, 2007 11:04 pm

Triple Axis Accelerometer

2007-02-18T02:32:52+01:00

hmm
i tried a Dimension Engineering Buffered ±2g Accelerometer 2x. hooked up as above, and it doesnt work
so your saying its because of the A variable?

Statistics: Posted by onesandzeros — Sun Feb 18, 2007 2:32 am

triple axis accel.

2007-02-17T23:58:15+01:00

hey subpilot; I've got a two axis and couldn't get it to work. When I installed a hitec single axis, uncommented the GOSUB tilt it worked.the reason for the two axis is that sometimes RN-! ends on its side and nothing happens. I DIM x AS BYTE instead of A because A variable is used for the voltage subroutine. I've asked both hive and beermat this question and they show me code that I can't understand like yours.can you pm me with more information,please?

Statistics: Posted by engineer — Sat Feb 17, 2007 11:58 pm

Triple Axis Accelerometer

2007-02-17T23:40:33+01:00

thanks alot for clarifying that for me

Statistics: Posted by onesandzeros — Sat Feb 17, 2007 11:40 pm

Triple Axis Accelerometer

2007-02-17T16:08:07+01:00

I put the accelerometer in a 14 pin DIP IC socket and mounted it inside his head, along with the remote receiver and the tri-colour eyes. I only use the Y axis, and it is wired into AD2.

Statistics: Posted by beermat — Sat Feb 17, 2007 4:08 pm

Triple Axis Accelerometer

2007-02-17T04:57:22+01:00

hey beermat
hows it going
thanks for your reply
how did u hook it up? as it has negative,positive x and y .
and where did you put it

Statistics: Posted by onesandzeros — Sat Feb 17, 2007 4:57 am

Triple Axis Accelerometer

2007-02-17T04:27:33+01:00

Thats the one I use, onesandzeros. Works like a charm.

Statistics: Posted by beermat — Sat Feb 17, 2007 4:27 am

Dimension Engineering Buffered ±2g Accelerometer

2007-02-17T04:22:30+01:00

Dimension Engineering Buffered ±2g Accelerometer
hey guys, is there any reason why this accelerometer wouldnt work?

i figure its 2 axis and thats all i need, and it uses 3-5v
-----
Dimensions: 10mm X 18mm
Weight: 0.9g
Operating Voltage: 3-5V
Draws less then 2mA

Applications:
Motion, tilt and slope measurement
Shock sensing

Performance:
Dual axis ±2g sensing
750mV/g sensitivity at 5VDC
500Hz bandwidth
Accurately drives up to a 3kΩ load
Based on the Analog Devices ADXL322

Protective Features:
Reverse voltage protection
14v overvoltage protection
Output short protection
----

Statistics: Posted by onesandzeros — Sat Feb 17, 2007 4:22 am

Triple Axis Accelerometer

2006-03-06T18:37:13+01:00

Why not use this accelerometer ADXL32x Series?

Sure, that would work. I switched over to 3.3V in order to use some other mods I have in mind.

Statistics: Posted by subpilot — Mon Mar 06, 2006 6:37 pm

Triple Axis Accelerometer

2006-03-06T18:30:54+01:00

Why not use this accelerometer ADXL32x Series? ( http://www.sparkfun.com/commerce/produc ... cts_id=406). It does not require voltage change.

Statistics: Posted by RubikCube — Mon Mar 06, 2006 6:30 pm

Triple Axis Accelerometer

2006-03-06T17:51:50+01:00

I just uncommented the robot_tilt line in the main loop and modded the subroutine like below. I'm just checking the one axis to see if he is laying on his back or his belly. Very preliminary.
'================================================
robot_tilt:
A = AD(6)
IF A < &h40 THEN GOTO tilt_back
IF A > &ha0 THEN GOTO tilt_front
RETURN
tilt_back:
A = AD(6)
'IF A < 30 THEN GOTO forward_standup
IF A < &h40 THEN GOTO backward_standup
RETURN
tilt_front:
A = AD(6)
'IF A > 200 THEN GOTO backward_standup
IF A > &ha0 THEN GOTO forward_standup
RETURN
'================================================

Statistics: Posted by subpilot — Mon Mar 06, 2006 5:51 pm

Triple Axis Accelerometer

2006-03-06T13:20:40+01:00

Neat - presumably you check this each time through the main routine?

Pev

Statistics: Posted by Pev — Mon Mar 06, 2006 1:20 pm

Triple Axis Accelerometer

2006-03-06T02:21:03+01:00

I just got my accelerometer board working. Now my RoboNova knows when he has taken a fall and gets back up on his own.
I used the Sparkfun Triple Axis Accelerometer http://www.sparkfun.com/commerce/produc ... cts_id=252

Here's where I put the board. I'm running it from A2D chans 5 & 6 (just using 2 axis so far)

Note: This accelerometer board runs on 3.3V and is NOT 5V tolerent. You must convert the 3024 over to run on 3.3V or provide an external 3.3V source for this board.

Statistics: Posted by subpilot — Mon Mar 06, 2006 2:21 am