Blog Archives

Tracking Balloons with WSPR

What is WSPR? WSPR is a low data rate digital protocol intended for measuring RF propagation, typically on LF and HF bands and at very low powers (often 1W to as little as 20mW). WSPR messages are digital packets that

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Posted in HAB, Projects

The CANable USB to CAN adapter is now cheaper and back in stock!

The CANable open-hardware USB to CAN adapter is now back in stock! You can order directly from the Protofusion Tindie store. I dropped the price to $25, making the CANable an even more affordable way to interface with the CANbus.

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Posted in Announcements, Projects

FeatherHAB Source Code Released!

FeatherHAB hardware and software source code are now available for download! The hardware is released under the Attribution-ShareAlike 4.0 International license and the firmware is released under the GNU Affero Public License. FeatherHAB Features: STM32F0 microcontroller SI446x transmitter broadcasting APRS

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Open-Source SWD Programming Adapter

After making the switch from AVR to STM32 microcontrollers, I redesigned my old 6-pin ICSP pogo-programming adapter for SWD. The new design allows programming with pogo pins or a small pin header soldered to the pogo pads for debugging, all

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Posted in Projects, ProtoProg

CANable now available for purchase!

The CANable USB to CAN adapter is now available for purchase on the Protofusion Tindie store! The CANable is an open-source USB to CAN adapter that works on Linux, Mac and Windows. The CANable shows up as a virtual serial

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Tenergy LiFePO4 CR123 Cell Test

I stumbled upon Tenergy’s lithium iron phosphate CR123 cells when looking for a fairly compact cylindrical rechargeable battery. The Tenergy RCR123A LiFePO4 cell, as listed on Tenergy’s website, supposedly has a nominal voltage of 3v and a nominal capacity of

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FeatherHAB: 2-gram High Altitude Balloon Tracker

FeatherHAB is a lightweight, small, and inexpensive balloon tracker. It tracks the location of a balloon with GPS and broadcasts the balloon’s position to the APRS network on 144.390MHz. The tracker is built around a Ublox MAX8 GPS module and

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Posted in HAB, Projects

Therm: a Tiny PID Controller

Therm is a very small PID controller with an OLED display, thermocouple interface, and USB port. It can switch an external solid-state relay for driving large loads, or a transistor for driving small loads. When attached to a computer, it

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Posted in Projects, therm

The CANable: a small USB to CAN adapter

The CANable is now available for purchase on the Protofusion store! The CANable is a hardware clone of Eric Evenchick’s CANtact project, an open-hardware USB to CAN adapter compatible with socketcan. I took his design and reworked the hardware to

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Posted in Projects

Immersion Heating with a Vacuum Tube

Recently I was doing some woodworking and wanted to try fuming a small test piece of oak with ammonia. The fuming process darkens the wood and gives it a nice aged, gray look. To speed the process up, I decided

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