Local CW keyer for remote keying

Video

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

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Configure Arduino firmware

Master key

Enable paddle echo in serial CLI with \*
Or default in firmware. Find this line
```
byte cli_paddle_echo = 0;
```
and set from 0 to 1
```
byte cli_paddle_echo = 1;
```

Slave key

Disable sidetone \o
Disable CW send echo in serial CLI with \:

Or default in firmware. Find line

byte cw_send_echo_inhibit = 0;

and set from 0 to 1

byte cw_send_echo_inhibit = 1;

Disable send ? after error char - disable (abt line 4655)
```
//default: send_the_dits_and_dahs("..--..");break;
```
and add new line between define other char (abt line 4617)
```
case '?': send_the_dits_and_dahs("..--..");break;
```

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

Server side

Your need server (Raspberry PI) with CWdaemon, or next hardware arduino cw keyer connected via Ser2Net proxy.

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

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