PIC18EXT.BAS Alteration

[rdheiliger]

I did try turning off the USB voltage. Same result.

I was leaving PortC.5 floating when running the pulses into PortC.4 and vice versa. By tying PortC.5 low or high thru a 1K resistor the problem does go away. Interesting that i don't have to tie PortC.4 low when putting pulses into PortC.5.

Will get another pulse input set up tomorow and see if the problem goes away.

I am using a water flow sensor that counts pulses of a magnetic rotor passing a hall effect switch. Am blowing air thru the sensor to test. Am assuming you are using a push button??

The board is my own design. It is intended as a solar collector control and monitor. This is about the last bug to have it all working.

Will let you know tomorow, if having both sensors connected works.


Thanks for the help!!

RD

[mister_e]

Your welcome! you could still use HPWM for your tests... this one have 2 channel.. just play with duty cycle and hop.. you're in business.

I also tried to left a pin floating but didn't had any problem.. must be because i use a development board and not a breadboard

But... on the other side, i don't see your full code, maybe somewhere you write to PORTC.x and it cause some "extra noise". BTW if you want to write to a single pin, consider LATx register instead of PORTx. Maybe you already know it?

[rdheiliger]

Hooked up both pulse sensors this morning. No crosstalk. Will have to see if i can sqeeze in a ground trace between the two pulse traces on the next board evolution.

Thanks again, the USB settup on these chips is more than a bit confusing.

RD