Continuing with my goal of adding new toys to my lab/man cave/junkyard I decided I needed a hot air soldering station for smd soldering. I have been using the one I have at work but always wanted one for myself.
Although ready made chinese stations can be bought for about 100USD that was about 80USD more than what I was wanting to spend. Also due to its price, volume and weight I would have to deal with customs for sure, and on this tiny country by the sea that is a nightmare.
Since there is no point in reinventing the wheel I used the same kind of hardware as with my soldering station, and reused most of the code. So this also uses an STM32F103 together with a 0,96″ OLED display and two rotary encoders.
The full schematic is very simple:
Since I wasn’t planning on having a PCB made for such a simple circuit I took a few shortcuts. The CPU is used with one of those ready made boards called bluepill, you can get one from aliexpress for something like 1.50USD, just search for something like “stm32 minimum system development board”. It looks like the picture below:
I also cheated on the voltage conditioning circuit and used an of the shelf lm317 dc-dc converter board. This costs about a buck.These and the other components were placed on one of those prototype boards. And that was it.
As always everything is available on gitHub.
On the next post I will describe the firmware features and post a video of this in action.