Baffled
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Posts: 46,084
I have this little problem with my robot. It is supposed to be a BOE-bot type
robot. I have everything working except the servos.
Basically the BS2 drives/reads 2 IR LEDs, one IR detector, an LCD, and 2 servos.
The LCD is to display what direction the BS2 is intending to go.
When I hook up everything the 'bot goes back and to the right. but when i
remove the ground from the servos the 'bot works fine. Also i have tried
starting the bot with the servos on and then remove the power and apperently it
only matters what state the servos are in (on/off) when the BS2 starts the
program, (ie if the servos are on when the BS2 starts and they are turned off
afterward the BS2 still acts funny). I also have a 2200uF cap across the
servo's power supply, which is different from the BS2's power supply.
I have no idea as to what might be causing the problem. I was thinking of adding
an optoisolator to the servo input but haven't got around to it yet.
Thanx
Seth
robot. I have everything working except the servos.
Basically the BS2 drives/reads 2 IR LEDs, one IR detector, an LCD, and 2 servos.
The LCD is to display what direction the BS2 is intending to go.
When I hook up everything the 'bot goes back and to the right. but when i
remove the ground from the servos the 'bot works fine. Also i have tried
starting the bot with the servos on and then remove the power and apperently it
only matters what state the servos are in (on/off) when the BS2 starts the
program, (ie if the servos are on when the BS2 starts and they are turned off
afterward the BS2 still acts funny). I also have a 2200uF cap across the
servo's power supply, which is different from the BS2's power supply.
I have no idea as to what might be causing the problem. I was thinking of adding
an optoisolator to the servo input but haven't got around to it yet.
Thanx
Seth
Comments
recommended elsewhere when I was playing around with servos. Also, are you
running the I/R LED's off the stamp power? When I added one more I/R LED to
my BS1 line follower (also running two 5-volt relays) it acted flaky. Rigged
the LED's to run off the 9-volt battery and the problem went away.
As far as the servo power, I had problems using a different power source
also. Not sure what caused it, but when I built my own board with a 5-volt
regulator and ran everything off it, they worked fine.
Original Message
> I have this little problem with my robot. It is supposed to be a BOE-bot
type robot. I have everything working except the servos.
> Basically the BS2 drives/reads 2 IR LEDs, one IR detector, an LCD, and 2
servos. The LCD is to display what direction the BS2 is intending to go.
> When I hook up everything the 'bot goes back and to the right. but when i
remove the ground from the servos the 'bot works fine. Also i have tried
starting the bot with the servos on and then remove the power and apperently
it only matters what state the servos are in (on/off) when the BS2 starts
the program, (ie if the servos are on when the BS2 starts and they are
turned off afterward the BS2 still acts funny). I also have a 2200uF cap
across the servo's power supply, which is different from the BS2's power
supply.
>
> I have no idea as to what might be causing the problem. I was thinking of
adding an optoisolator to the servo input but haven't got around to it yet.
ground, and the 7805 i'm using to regulate voltage has problems cranking out the
amount of milliamps needed. and how should i drive the LEDs? i have had problems
using the 555 because it really couldn't hold the 39khz (as in it constantly
shifted frequency) i was thinking of using a seperate prcessor for the LEDs or a
dedicated IR detector kit.
What i dont understand is that the program works flawlessly if the servos are
off (but the signal is still being sent) but when i turn them on the problem
shows up, and why it doesn't matter what I do after the initialize part of the
program.
thanks for you response
Seth