Don Bindner

Amateur Radio If you live in the Kirksville area, consider becoming a member of the Northeast Missouri Amateur Radio Club.
Distributed proofreading Volunteer to proofread out-of-copyright works for Project Gutenberg. This is a very good project.

Crisscross - Collaborative crosswords. Solve crosswords together with your friends, even if you can't get together in meatspace!
DVD remote via MQTT broker - A custom television control integrated into an existing home automation system, with an intuitive HTML / CSS / JavaScript user interface.
USB keyer - A Morse code interface for the computer with integrated touch sensitive paddle. Can be used for solitary practice or for code via conference (e.g. Zoom).
Z-273 programmer - A fully electrically isolated computer interface for reprogramming the frequencies of older-model Midland commercial radio transcievers.
Mid Morse Code Beacon - An 85mW (approximate output power) FM Modulated Morse code beacon transmitter based on the Si4063 RF transmitter and the MSP430 microcontroller.
Tiny Morse Code Beacon - A 13mW (approximate output power) FM Modulated Morse code beacon transmitter based on the Si5351 programmable clock generator and the MSP430 microcontroller.

For the 2015 Great Plains Super Launch I designed a new APRS beacon radio, after one of our team members lost a balloon earlier in the year.

My circuit for a high altitude balloon radio based on the DRA818U or DRA818V chip and the NavSpark GPS module.
- BalloonRadio.pdf - schematic for the radio
- BalloonRadio/ - Kicad project for the radio
My circuit for the DRA818 daughter card that plugs into my master balloon radio circuit board (so you can easily change between VHF and UHF transmitters.)
- DRA818daughter.pdf - schematic for the daughter card
- DRA818daughter/ - Kicad project for the daughter card
Small circuit for an in system programmer header to make it easier to program MicroAPRS onto the BalloonRadio circuit board.
- BalloonISPheader/ - Kicad project for the ISP header
NavSpark/ - Scripts I used to set the fuses on the Atmega328p (I used an 8 MHz chip, even though the schematic shows 12 MHz), and for burning my modified copy of MicroAPRS. Both assume the USBTinyISP programmer.
- MicroAPRS/ - This patch applies against revision 777a0806f6766a9751b6b9f71ed115933674fe27 from the MicroAPRS git repository.
- MicroAprs/Navspark - source code for the NavSpark to communicate with the DRA818 radio module and the MicroAPRS module. Don't forget to put your own amateur radio call sign in the proper place in the code!
dms/ - Degrees/Minutes/Seconds conversions.
utc/ - UTC/local time banner

Calculus Made Easy by Silvanus P. Thompson. The original scans of this out-of-copyright book that I had donated for Project Gutenberg (https://www.gutenberg.org/ebooks/33283/). Read it online.
Free software Things I have written for DOS many years ago.
Linux software More free stuff I have written, only for Linux.
Other stuff Other useful stuff, including my VI reference card.
MSP430 Launchpad Some of my earliest experiments with the MSP430 microcontroller. A hello world program, and some fun other experiments I did to get to know the chip.
Recommended tools My take on the tools you'd want for working on electronics and microcontroller projects.
GnuPG public key - rsa3072/0x78169EE0 If you want to encrypt a message for me.