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Recent Forum Posts

Re: serial LCD 1602 Backpack using PIC16F690 for Hitach HD44780

here's the revised baud rate test chart

9998
jackberg1 Yesterday, 11:26

Re: serial LCD 1602 Backpack using PIC16F690 for Hitach HD44780

ASM , very impressif code,

thanks.
jackberg1 Yesterday, 08:17

Re: serial LCD 1602 Backpack using PIC16F690 for Hitach HD44780

its always better to use the hardware than bit-banged routines and there is nothing better than a ring-buffer to overcome traffic snarls

...
richard Yesterday, 02:57

Re: FSK demodulator in firmware

there are some good ideas here
https://www.romanblack.com/DTMF/DTMF_alg.htm
richard Yesterday, 00:01

Re: FSK demodulator in firmware

Plenty fast, I'd say.
At 32MHz an instruction cycle is 125ns. That's ~1250 cycles between zero crossings.

I'm not trying to interpret/decode the data, just demodulate the signal.
Every other...
HenrikOlsson - 6th October 2025, 20:42

Re: serial LCD 1602 Backpack using PIC16F690 for Hitach HD44780

edited BaudR var word : baudr = 3313 and TRISA = 111110

1st receiving random characters
2nd normal

what could be done to avoid the first
thanks.

9997
jackberg1 - 6th October 2025, 20:10

Re: FSK demodulator in firmware

Although it is a low frequency, still a zero cross happens every 156.2 usec for the 3.2KHz signal.

Will the pic be fast enough to process that signal? I am sure ZCD and timers will be enough, but...
Ioannis - 6th October 2025, 18:48

FSK demodulator in firmware

I have what looks to be a 1.6/3.2kHz FSK signal that I'd like to demodulate to a bitstream using a suitable PIC.
It's a two wire system with bursts of the FSK signal riding on top of the DC supply,...
HenrikOlsson - 6th October 2025, 18:07

Re: serial LCD 1602 Backpack using PIC16F690 for Hitach HD44780

from my last edit,

' Jumpers
' J3 300 600 1200 2400 4800 9600 14400 19200 28800 38400
' 1--2 RB7 On On On On On On
' 3--4 RA2 ...
jackberg1 - 6th October 2025, 16:47

Re: serial LCD 1602 Backpack using PIC16F690 for Hitach HD44780

when testing baud rate, usualy I start at 300 and up

when it stopped working then I set pace = 1

and re-start from the last baud rate tested.

16F690 Xtal 20Mhz

set pace to 1
sEROUT2...
jackberg1 - 6th October 2025, 16:12

LAB-X2 Assembled

From £69.95
Buy it Now

The LAB-X2 Experimenter Board combines the convenience of the LAB-X1 with the simplicity and flexibility of the PICProto boards. The LAB-X2 contains the circuitry required by the PICmicro MCU to operate: 5-volt power supply, oscillator, reset circuit

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