Thread: Help! DIY 4 amp L297/6203 driver
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09-11-2009 #1
At a guess i would surmise the PIC is detecting the clock to the L297 and after some timeout after the last clock pulse is pulling Vref down to reduce the current in the motor. A 555 set up as a monostable with say a 5sec delay and triggered from the clock line might do the trick...
[edit] must learn to type faster![/edit]
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09-11-2009 #2
Thanks for the replies
Tribbles
Im not using the optos as i plan to make modular set up with a master board for the optos. Thank for spotting the mistakes, thought it was a funny looking diode :whistling:
The +5 is supplied from the input connector, Bottom left.
Irving
So is the Pic just earthing the 5v supply to the VREF making it 0v which means there is no holding current? I presume it would then revert back when a pulse is detected on the clock line?
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09-11-2009 #3
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09-11-2009 #4
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10-11-2009 #5
Modulating the vref would make sense as no holding current isnt much use. Is that why a Pic is used rather than a 555?
I did find another cuircuit that uses logic gates to trigger 2 separates trim pots but the control signal came from an external source or the software. would it be possible to use a 555 chip to trigger this circuit?
This would make more sense and be easier to setup
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