servo signal 2 H-bridge

[rx5]

hi,

happy new year!!!


any info/links about converting the 1ms->2ms signal FROM SERVO control into 2 input H-bridge???

i dont know how to exactly expain this but here goes:

>> at center of stick (w/c results in 1.5ms) , there is 0,0 at the H-bridge input...

>> at the (Forward) position of stick (1.5ms -> 2ms) , we have 0,1... or if its 1.8ms, i get a pulsing (PWM) of logic 1...

>> at the other extreme end, (Reverse) position of stick (1.5ms -> 1ms) , we have 1,0...or if its 1.3ms , its a pulsing (PWM) of logic 1..

whew... was it clear?? lol

much like an electronic speed control for R/C....

Thanks..

 

[IanP]

This job can be easily done with a microcontroller ..

For example, PICAXE has a command called PULSIN .. I allows you to measure the length of a pulse .. see attachement below ..

The BASIC program may look like this:

..
pulsin 3, 0, w1 ‘ record the length of a pulse on pin 3 into w1 ..
if w1<135 and w1>125 then story1 ' 135 = 1.35ms
if w1>145 and w1<135 then story2
if w1>145 and w1<155 then story3
goto story2
..

story1:
high1
low2
..
story2:
low1
low2
..
story3:
low1
high2

.. or something similar ..

Regards,
IanP

 

[rx5]

Hi IanP,

thanks...

that would really simplify things ... BUT

PICAXE chips are out of my league(not commonly available).. maybe I could order 12C508 etc ....

what I was hopefully looking for was a discrete(sort of) using transistors and simple logic gates(chips)...

could it be?

-Ralph