Audio Frequency Shift Keying Telemetry data for my balloon flight will be transmitted onto the APRS (Amateur Packet Reporting System) network, which is a well established network of Amateur Radio Operators here in the US. Data intended for the APRS network is transmitted using the AX.25 protocol (will cover this in a later post) using something called … Read more
Yesterday, I wrote the AFSK-1200 modem for the flight computer. This was challenging, in-fact, I worked several days to figure it out. Being new to the AtMega328p I found the manual tough going. I plan to put together a write-up on this at some point in the future, to help others through the pains. … Read more
Having reverse engineered the old tracking board over the weekend, I connected up the GPS module and, after debugging minor issues on the serial port… GPS Input That’s right, I’m receiving GPS data in NMEA format strings, and I was able to get a lock. The next step with the GPS component is to … Read more
I assembled this tracker over a year ago. As my blog post back then will have indicated, I did so in frustration having failed to produce a more elegant design on the mill. When I built this board, I really did just grab the components that I had to hand and assemble it on the … Read more
I’ve owned this CNC mill for several years. In that time, I’ve rebuilt it twice and added limit switches (crudely using hot melt glue!). There is something I have never done with it though, and that’s to actually use it. In fact, I’ve never cleanly finished configuring it. As I set out on my mission … Read more
This is a re-post of a post I made on my previous blog. I’ve had this tracking board for over a year now, and still didn’t program it! Sometimes life gets in the way, and my life has kept me busy for the past few years. Now it’s time to start looking at this project … Read more