|
Laser system for Boe Bot
Angela from United States [3 posts] |
15 year
|
|
Hi, I am trying to make a "laser" navigation system for my boe bot using frequency sweeps. I am not familiar with the types of "lasers" that I can buy that are compatible with Stamp that can do this. Does anyone know what "lasers" could do this? I am trying not to use the IR led and detector from the kit...
|
|
|
|
No0bert from United States [11 posts] |
15 year
|
I don't think you want to use RoboRealm for such a task, as it would be much easier to implement simply with a micrcontroller. For example, in your setup you might want a servo, and mounted on this panning x axis servo, a high intensity laser beam. The servo will pan, and connected to the MCU, is a phototransistor, the phototransistor will be able to determine the T.O.F of the laser beam, thus determining the distance.
Using the pseudo code:
If time to receive laser pulse > .00001 sec
then go forward
If > .00001 sec
go backwards
I think I explained it badly, but my two cents
It might be easier with RoboRealm, but I am a noob with this program
|
|
|
|
Angela from United States [3 posts] |
15 year
|
Ah! Thanks so much ComputerGuy for your advice *bowing*. I will go with your suggestion.
|
|
|
|
Anonymous from United Kingdom [99 posts] |
15 year
|
Just a quick comment. Since the speed of light is 3*10^8 m/s. If the time that elapsed was 0.00001 seconds (or 0.01 ms) the light would have traveled a distance of 0.000001s * 3*10^8 m/s or 300 m /2 or 150 m!
I don't think you need to worry about obstacles 150 m away! Unfortunately most microprocessors run order of magnitude at 20 Mhz which means that MAXIMUM time between executions is 1 / 20^6. If we could somehow measure time in one clock cycle (we can't it takes more like 7) we still would get a distance resolution of 1/ 20^6 * 3 ^8 = 15m / 2 = 7.5 m! (Really more like 50 meters by the time we were done.)
This is why laser scans cost $2000!
have fun!
profmason
|
|
|
|
Angela from United States [3 posts] |
15 year
|
Thanks Professor Mason!
lol I had to read your post a couple times to fully understand the conceptual aspect of it but you explained it really clearly... (it usually takes a little while for me to think things out)... but I think I got it!
|
|
This Thread