* Password is currently available to patrons on the KM6LYW Patreon Page
Why the paywall? Anything gets you access to the DigiPi image, even a dollar.
The point is not to keep the software locked up, but to ultimately throttle the
questions and support load. Plus it gives you priority access to design
decisions, code contributions and early releases. DigiPi is community driven
and open source. I assure you there are no commercial interests, other than
beer money. At some point, once development settles down, we'll make a more
Please share with friends, but do not post this image online. All
of the software carries an open-source license and is freely available,
just not all in one place in a bootable image.
Thank you for your support.
What is a DigiPi?
The DigiPi is the ultimate hot-spot for all amateur radio data modes, including
APRS, ax.25, winlink email, ft8, js8cal, slowscanTV, PSK31, packet and even CW.
The implementation is an elegant, inexpensive, low-power, open-source
Raspberry-Pi--based amateur radio data transceiver, managed exclusively by
web browsers or smart-phone apps, with no bulky keyboards, monitors or
Packet radio Terminal Node Controler KISS interface via wifi or bluetooth
Use with xastir, yaac, woad, aprsdroid, and any open-standard KISS apps
APRS WebChat interface
Send instant messages over the APRS packet network via your web browser
APRS Packet Radio Network digipeater
Repeat packets heard on 144.390 and 144.800(europe)
APRS Packet Radio network IGate
Bridge APRS Network to the Internet for email, sms, and other online services
Winlink email server
Listen for Winlink radio clients requesting to send/recieve email
Winlink email client
Pat, web-based inbox/outbox email interface
ARDOP sound modem to connect to winlink servers world-wide on HF bands
Woad Winlink Android app connects to DigiPi via wireless TNC/KISS interface
Ultra low signal-to-noise ratio contacts via web-browser/wifi/phone
Ultra low signal-to-noise ratio keyboard-to-keyboard via web-browser/wifi/phone
CW, PSK31, RTTY, Contessa, FSQ, Hell, IFKP, MFSK MT63, Olivia, PSK
QPSK, 8PSK, PSKR, THOR, Throb, WeatherFax
Slow Scan TV
Send/receive images via web-browser/wifi/phone
Radio connected network protocol used for winlink/node services
IP tunnel, with actual address on the internet (44.* for amateur radio)
Run your own bulletin board, or messaging service
Connect to other nodes, via intermediate nodes
Raspberry Pi (Pizero, Pi3 or Pi4)
Audio board: Fe-Pi Audio Z v2 *or* Audio Injector Z (edit /boot/config.txt)
A simple push-to-talk circuit using a FET, resistor and gpio pin, or
A USB cable for radios which support cat/rig control and audio over USB
An optional Adafruit 1.3" TFT display
Optional LEDs for transmit/receive/bluetooth
Pre configured software on DigiPi Rapberry Pi SD card image:
Direwolf sound modem and TNC
Direwatch display driver
LinuxRMS Winlink server
Pat web-based winlik email client
Web-based mangement interface
Bluetooth rfcomm serial port
AX.25 Networking, IP, ax25d services
Virtual display driver to use interactive apps via web-browser/wifi/phone
Linux Node service, netrom, bulletin board, Infocom games
Audio driver and mixer settings for audio hats (FE-Pi and Audio Injector)
ARDOP modem for 300baud packet on HF bands
Rig Control (rigctld) for CAT/audio on USB-connected radios
Web-based wifi setup, log viewers, and axcall tty interface
There are two different DigiPi builds. A PTT-circuit build, and a USB-connected
build. Radio's with USB ports (ic7300, yaesu991, ic705, etc) do not need all
of these parts, just the Raspbery Pi and a USB cable is all you need. If your
radio has a conventional PTT circuit/wire (yaesuFTM400, dual band rigs, etc),
you'll need the FET/resistor to trigger push-to-talk, an audio card, and will
need to fabricate a cable for your radio, see the wiring diagrams below. The
screen, while totally cool, is optional and can be attached to either build.
Bill of Materials, including PTT circuit
A Raspberry Pi, ideally a Pi Zero 2W AmazonAdafruitChicago_Dist ($15)
Watch http://rpilocator.com during the global supply chain crisis and chip shortage.
If using USB, a USB "OTG" cable between your pi and radio radio.
If NOT using USB, you'll also need the following:
Audio hat, one of:
Fe-Pi Audio Z v2 [x] 1 Fe-Pi Sound Card without kitWB7FHC ($24)
Audio Injector Z Amazon ($20) (edit /boot/config.txt to enable)
Stacking header Adafruit(best) Amazon ($3)
2N7000 N-Channel FET Amazon ($2)
100K 1/8 watt resistor Amazon ($2)
An optional Adafruit 1.3" ST7789-based TFT display AdafruitAmazon ($16)
Optional LEDs for transmit/receive/bluetooth Amazon ($9)
Ferrite Bead around all the wires between the radio and the audio board ($5)
A step-by-step hardware build video is now available on the KM6LYW Radio youtube channel.
Radio's with USB ports (ic7300, yaesu911, ic705, etc) do not need
the follwing wiring, just the PiZero and a USB cable is all you need.
All other radios will require a sound card (yaesu ftm400, ftm100, 2980,
all HT's). Choose either an "Fe-Pi" or "Audio Injector Zero" audio board,
and refer to the respective wiring diagram below. The Fe-Pi is works
with the broadest range of radio input/outputs, while the Audio
Injector Zero shouldn't be used with radios that have low output
(Baofengs, Kenwood HTs), as it introduces a -3dB cut on Line-In.
You might also try an audio dongle, but keep in mind they're typically
"mic level" and not exactly compatible with a radio-speaker output
from an impedance perspective. You might experiment with a voltage
divider or inline-resistor to leverage these otherwise affordable
USB dongles. They do tend to work well with HT's or low-output-audio
radios like Baofengs and Kenwood HTs.
Sound-card-builds will also require a ferrite bead around the wires
between the radio and the sound card.
Supply-chain chip shortages are very real! Get what you can while
you can. Watch http://rpilocator.com for up-to-date inventory
world wide. This is why I'm suggesting two alternative audio boards:
Choose either the Fe-Pi or Audio Injector Zero diagram
A step-by-step software configuration video is now available on the KM6LYW Radio youtube channel.
If you haven't already, build the hardware here: https://youtu.be/io-YnP0Q-ow
This will boot on a Raspberry Pi Zero, Pi3, or Pi4.
You'll need to "unzip" the image first to decompress it. On Linux, it's
Then flash it to your SD card. It'll fit on a 4G card with room to spare.
Look up how to do this. On Linux, it's
dd if=digipi-1.6-2.img of=/dev/sdX bs=4M
where sdX is the drive letter of your blank SD card (run dmesg to see).
On Windows, try this: https://www.addictivetips.com/windows-tips/flash-sd-card/
On Mac, try this:
Boot the Raspberry Pi with the newly flashed SD card.
Wait for the "DigiPi" wifi hot spot to appear on your phone or pc's wifi
settings. Connect to the "DigiPi" hot spot with password "abcdefghij"
In a web browser, visit "http://10.0.0.5/wifi.php"
Enter your home wifi ssid and password and reboot. Once booted on your home
network, visit the website http://digipi/.
If the host isn't found, login to your router and look for any newly connected
wifi devices, and use the associated IP address. Also check to make sure the
DigiPi hotspot no longer exists, if it still exists, this is a sign it had
trouble connecting to your home wifi.
Now that the DigiPi is on your home network, click the "Initialize" link
at the bottom of http://digipi/.
You need to add your callsign, passwords, grid squares and other
localization items to your Pi.
Keep in mind, once you change a value, you can't use this process to change it
again. See /home/pi/localize.sh for the location of all the configuration
files and feel free to make edits by hand if you need to add or change
anything. Future versions of DigiPi will let you change things
repeatedly via the web interface, it's on my todo list.
Once changes are made, reboot the DigiPi by clicking [Reboot] at the
bottom of http://digipi/. This will boot the system back into firmware
Enjoy your DigiPi!
The "pi" user password is "raspberry"
If not using a USB radio this expects a single audio device, possibly the
FE-Pi Audio Z v2, or Audio Injector Z. Edit /boot/config.txt to switch
between these two audio hats. The default is currently the FE-Pi.
The filesystem is "read only" to prevent SD card wear and so you don't
have to do a clean shutdown (just turn off the power is fine). To make
modifications, you must "sudo remount" first.
If you have a usb-connected radio, no soldering is required. For
ft8/sstv/js8call, you'll want to configure your radio from within
Yaesu 991 is rig 1035
Icom 7300 is rig 3073
Icom 705 is rig 3085
The GUI apps (js8call, fldigi, ft8, sstv) can be used with a VNC client on your
phone. This can be considerably easier to use than a web browser, particularly
when it comes to typing, zooming, etc. "VNC Viewer" on Google Play
is sufficient. The VNC login parameters are:
host: "digipi:5901" or "10.0.0.5:5901" in the field
Direwolf will exert a voltage on gpio pin 12 for Push-to-talk. It's up to you
to use this signal to short your PTT wire to ground (see FET wiring
If you hookukp a green led (with 220ohm resistor inline) to gpio pin 16
it will light up when direwolf detects a carrier.
If you hookup a red led (with 220ohm resistor inline) to gpio pin 26 it will
light up on transmit.
At the moment, for USB-connected radios, the transmit LED will not
illuminate during transmit (limitation of direwolf, feature request
If you hookup a blue led (with 220ohm resistor inline) to gpio pin 5 it
will light up if you connect a bluetooth device like aprsdroid. I used
a 3.2K resistor with this blue led in my implementation because blue
leds are oddly bright.
If you'd like to change the hostname (and bluetooth name), edit /etc/hostname
and also add your hostname to the list next to 127.0.1.1 in /etc/hosts.
To use a bluetooth app (aprsdroid, woad) you'll need to pair the device first
sudo systemctl restart bluetooth
# on phone/wifi device, open bluetooth settings, make visible for pairing
# watch for [NEW] Device FC:19:10:F7:55:C8 Device_name
# click [pair] on phone
yes # on bluetoothctl prompt
# press [yes] on droid device
# the USB led/icon will illuminate momentarily on the DigiPi
shutdown -r 0
When configuring aprsdroid, in connection settings, connection type,
select "Bluetooth SPP". Select Channel "1". TNC Bluetooth Device
should be "digipi".
This image supports a Pi TFT display (1.3 and 1.14" tested)
Buttons on the display will start the igate or digipeater services.
Adjust the volume on the receiver while "tail -f /run/direwolf.log" until
the average audio volume is around "50(x,y)."
Run alsamixer and adjust the "line" level, while listening to transmitted
packets to make sure they're not overdriven, and about the same volume
as other aprs radios in your area.
the APRS Digipeater service will repeat WIDE1-1 traffic and relay all
message-type packets sourced from the internet to targets within 160km
of your digipi. Adjust ~/direwolf.digipeater.conf to taste.
The device becomes a hotspot if you don't setup your wifi, in which case
the ssid is "DigiPi" and the default password is "abcdefghij". You'll find
the device at http://10.0.0.5/ . If you're in the field, obviously, this
will be its address.