Search found 9 matches

Here's a routine that I wrote for a PIC16F877. In this case I didn't want the ASCII values of the pushbuttons, but 0, 1, 2 etc for the numeric ones, 0xA, 0xB etc for the letters ABCD and 0xE for *, 0x ...

The zener diodes would do the job, but if you wire it as shown in Ljbeng's diagram you are in for an unpleasant surprise. Half of the time, the reverse voltage across the optoisolator's LED will be th ...

"20MHz crystal seems to be 1.22 KHz (per Microchip manual)" was a quote from one of my postings! To get a complete sentence, it should have read something like, "The slowest PWM rate you can achieve w ...

You can check the input side of the line via an optoisolator. What you need to do is put a capacitor (rated for the line voltage, plus a good safety margin) in series with the isolator input, and a di ...

I'm not sure I'd have thought of what Ttelmah said, but it sounds very plausible. The compiler will suppress interrupts under some conditions and as I recall, there is no warning (I would call that a ...

Hello again.

You're going to have a tough time with 2 interrupts. My suggestion would be to use only one of them, and it should clearly be the one that triggers most frequently, the Timer1 at 5000/ ...

I don't think you can send a "long string of bits" without an interrupt. And if you use CCS's interrupt service routine, the time to process each one ("pushing" and "popping" registers) will gobble al ...

Yes, the minimum frequency available with a 20MHz crystal seems to be 1.22 KHz (per Microchip manual).

You didn't say what resolution you need for this PWM output. If it were, say, 1% then you coul ...

A method that I'm using for about 20 PICs communicating with a computer is "modified RS422" where the master (the computer) can talk any time it wants to, using packets containing an address. Every ch ...