ericgibbs

hi Alex,
Copied it, I will give a spin, let you know.

__________________
Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/

zanes

Well I'm absolutely clueless now, with LEDs on the outputs working as intended, and the PIC running the H-bridges fine when not using inputs from the sensors. I must be nearly there!!

ericgibbs

Hi,
Running in Sim OK.

Observed Operation:
RA2 and RA3 low NO flashing RB0 and RA0 are both Low
;
RA2 high starts RB0 flashing.
RA3 high starts RA0 flashing
;
RA2 and RA3 high start RB0 and RA0 flashing.

Observed flashing rates are the same for both pins, when operating separately or together.
What are your sensor voltage levels.? going into the PIC pins.

__________________
Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/

zanes

Should be flashing very quickly though? Sensor voltage levels I am not sure, but it's enough to trigger an LED, so is obviously triggering the PIC program.

ericgibbs

hi,
In real time, not the Sim, they will be flashing very quickly, you have no Wait states.

The input threshold voltage is just over +2V for a +5V supply.
Do you have a DVM.?

__________________
Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/

zanes

In the labs at uni, or at home. It triggers an LED on the outputs though, so it is obviously triggering it. Or is the output somehow (linearly?) related to the input voltage?

ericgibbs

hi,
No, there is no relationship between the digital input and output voltages.
When you say it triggers an LED, do you mean it lights an LED.?

Can you post a diagram on how you have connected one LDR and one output pin, just a quick sketch would do, include all the components connected to the input and output pin.

As you are driving an H Bridge, why are toggling the output pin at such a high rate.? rather than at a fixed voltage level.
At a rough estimate, the Port output pin is toggling around 30KHz.!

__________________
Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/

zanes

Hmmm.... I think the problem may lie in my hbridge, as I have just been doing some testing with the PIC loaded up, and I've got some weird results. I'll probably cop out and buy a controller IC!
Yes, it lights an LED. The reason I have my program setup this way is that is the easiest way I could think of implementing my design on my PIC!

ericgibbs

hi,

Make these small changes to the program, the outputs dont toggle, they stay high when called and go off if not called.

__________________
Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/

zanes

Brilliant!! It works-perfectly!
Shows how much I need to learn. Thankyou!!