Servo Output

computer guy

I have a motor controller that requires 2 servo inputs in order to control 2 motors.

I need to know how to get the BS2 to output this:

Computer Guy said...


Input Signal:

Input method..........40-70Hz PPM 1.5mS Mark Center [noparse][[/noparse]RC standard]
Input Voltage..........2.2v - 18v Max
Input resistance..........50kohm
Input current..........Fixed at 5mA/Channel

Please note 'input' is into the motor controller. From the BS2
Thank you

allanlane5

You hook up 2 I/O pins, and a ground, to the servo controller.

That magic seeming "40 to 70 Hz, 1.5 mSec Mark Center", really means:
40 Hz == every 25 milliseconds
70 Hz == every 14 milliseconds

1.5 mSec Mark Center == "1 mSec is full left, 2 mSec is full right, 1.5 mSec is stop"

So, you must send this thing, using PULSOUT, a 1 mSec to 2 mSec signal, repeating that signal every 20 mSec. Just like a "normal" modified servo control signal.

Which looks like:

MAIN:
PULSOUT LeftSig, 500 ' On a BS2, there's 2 uSec per 'tick', so 500 'ticks' is 1 mSec
PULSOUT RightSig, 1000 ' 1000 'ticks' is 2 mSec. If you have the motors back-to-back, one spins left while the other spins right to go forward
PAUSE 20
GOTO MAIN

computer guy

Thank you

My motors are left and right motors so they are different to each other.

so i would use

MAIN:
PULSOUT LeftSig, 500
PULSOUT RightSig, 500
PAUSE 20
GOTO MAIN

to go full speed forward/backward and

MAIN:
PULSOUT LeftSig, 1000
PULSOUT RightSig, 1000
PAUSE 20
GOTO MAIN

to go full speed in the opposite direction.

Once again thank you