When I saw this Pixie QRP radio for 10 bucks online, I thought it would be a fun little project to try out to get into the world of HF. I wasn’t expecting much from it, considering its price, but given that it would be some more soldering practice, I gave it a shot. There were no documents included in the kit, so I had to do some research and reverse engineering to assemble it properly.

This week was extremely CAD heavy for me, with a mix of projects that I ended up working on both during shop time, after school during robotics, and at home as well. But on a more interesting topic, Jonas and I got the steering working on the Ford Think automatically. In the previous year, his brother installed a large motor and chain to steer the wheels electrically. This was only done in a quick test, so we wanted to make sure it would still work for us.

Although this was a short week, I finally returned to the backup alarm circuit and wiring for the Ford Think (golf cart) which had been previously abandoned. Resuming where I left off, I found that the alarm was installed and there were power wires properly installed and routed, yet they remained unconnected. From past experience, upon applying power to the alarm, it will sound a (loud) continuous tone rather than the classic beeps we hear on trucks.

I figured today, which was a day off from school due to local voting, would be a great time to re-do my ham radio antenna setup and change my base station location. Honestly, I haven’t touched my radio very much lately, mainly because of the workload from school along with other projects I have been working on. The other issue is that the radio is located in my basement which is not the most enjoyable place to endure long QSOs.

There were significant things done to the Golf Cart (which I think I should start calling a car because its bigger than a golf cart really) this week which is super promising for its future. With the help of Jonas, the brake lights, horn, wiper, and washer fluid pump all work properly! Some of these steps were really insightful as I finally got a grasp on the standards used by Ford when wiring the vehicle up.

This week had both positives and negatives. We finally got the 12v converter installed and wired up completely on the Golf Cart (which I think is more of a car than a golf cart) and also installed the separate enable wire. In order to provide power to it, I had to wire it through an unused fuse port left over. Originally, we tried to use heat shrink and solder to connect the wires, but the thick strands and low gauge proved to be extremely difficult.

The golf cart works! This week, on Wednesday, I was able to successfully get the battery wired up and secured and I was able to give it a quick test drive!! Overall, the golf cart feels a lot more punchy compared to the previous lead acid batteries. This is due to a natural phenomenon known as voltage sag, which is particularly dramatic in lead acid batteries. A simplified view is presented in the graph below.

The Golf Cart battery system is finally done! Well, almost. We had the whole thing ready to go, and then we realized something catastrophic, but I’ll get to that a little later. I started the week off discussing some ideas with Tim on how we could mount the lager orange battery cables to the battery system feasibly, considering that the individual cells don’t have any direct mounting points. We sketched some simple ideas.

This week was convoluted, considering that we had Thursday off from school. During school, I worked on the battery system, specifically setting up and configuring the BMS system for it to safely charge and balance all cells. In order to interface with the BMS (can be found on XiaoXingBMS here) you apparently need a special UART tool that they sell. To me, it looks like a regular USB-UART Serial cable, but after using the Adafruit USB to TTL Serial cable I found that I couldn’t establish communication with it to extract any valuable information from it.

I began the week by trying to start a print on one of the Fusion 3 3D printers at school, but the extruder ended getting totally jammed up and broke some of the structural plastic pieces over-night while I left it going. Considering that the PLA that the extruder parts were printed in were already old and brittle, when the PLA got snagged on something, the plastic was the first to go.