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I need a precision pulse generator. I want a PIC to generate a precision low output exactly once a second. The active low pulse needs to be about 120 microseconds long and must occur exactly once a second. Well pretty darn close to exactly. Is this possible with Picbasic?
Which PIC has a built in high stabillity oscillator by the way to keep component count down?
Also, later I may input an external GPS pulse into the PIC to keep it more accurate. How hard would that be?
Matt
Hi Matt,
I don't think any built-in osc is going to get anywhere near 'precise'. You'll need to use an external crystal. (unless there are some new pics out...)
Arch
Hi, matt
Precision ... ok. but this doesn't mean nothing !!!
How much !!!!
Alain
Hello Matth,
M>>I want a PIC to generate a precision low output exactly once a second. The active low pulse needs to be about 120 microseconds long and must occur exactly once a second.<<
Assuming the low pulse is 5 volts.
TRISB=%00000000
Loop:
Portb.0=1
pauseUS 120
Portb.0=0
pauseUS 880
goto Loop
Get a accurate scope and measure it... if it needs to be adjusted, adjust the pause that you want.
Dwayne