Local CW keyer for remote keying

This revision is from 2014/04/20 17:24. You can Restore it.

This project was terminated, because its functionality will be inserted in the new OpenInterface

Principle - arduino keyer identifies the played characters (enabled echo feature in K3NG code) and sending to server for playing with other hardware of the cw keyer or cw daemon (contains RemoteQTH server for Raspberry PI). This configuration is resistant to change internet latency during transmission, because not transmitted separately each dit/dash, but the entire ASCII character that perfectly transmiting the server side.

Main functions:

CW keying
Detect keying characters and show on the LCD
Send keying characters to USB serial (echo mode)
CW sidetone during the PTT is ON, otherwise play audio from RX
Sidetone volume
Four SET/MEM switch

← Back to web page

Configure Arduino firmware

Enable serial CLI echo as default in K3NG firmware.

Find this line

byte cli_paddle_echo = 0;

and set from 0 to 1

byte cli_paddle_echo = 1;

Example firmware settings

Plug&play connecting in Linux

Udev rules

After connect Arduino nano show IDs with type dmesg in terminal, and edit udev rules

vim /etc/udev/rules.d/99-remoteqth.rules

SUBSYSTEM=="tty", ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", ATTRS{serial}=="A702R984", SYMLINK+="ttyCW0", RUN+="/etc/cw.sh"

Connection script /etc/cw.sh

#!/bin/bash
SERVER=192.168.1.1  # IP YOUR SERVER
CWDPORT=6789
killall socat
sleep 3
socat UDP:$SERVER:$CWDPORT /dev/ttyCW0,raw,echo=0 &
exit 0

Connecting in Windows

Assembly

Circuit diagram

Jumper JP1 choose output between headphone and external out on P1
K1 prepared for connection CW speed potentiometer
RV1 set CW sidetone volume
RV2 preset LCD contrast

✔ Components

❏ Solder J2, D1, D2

❏ All parts of backside (C1 sign wrong polarity on PCB)

❏ J1, four TACT switch

❏ LCD

❏ Insert Arduino Nano

← Back to web page