Adjustable power supply and voltmeter based on STM32F030C8T6 and MC34063

 
I bought the MC34063 from LCSC Mall because it was on sale, and on the side, I built a switching power supply based on the MC34063 and STM32F030C8T6. It has two outputs of approximately 1.26~7V, an output voltage display function, and a voltmeter function. The project is still being improved.
1. This power supply can be used as a student power supply, supporting a maximum output of 3A. The MC34063 power chip has built-in protection, so no fuse or overcurrent protection circuit is needed.
2. It has one ADC input, supporting 0 to 12V input. In the example, it's connected to 3.3V using a jumper.
3. The two outputs are connected to the ADC through op-amp followers, offering advantages such as low power consumption and accurate measurement.
///////*******************The bumps during the construction process, author's ramblings *******************/////////////
/*@breaf
1. The VCC and GND of the 0.96-inch OLED are reversed!! Thankfully, I checked it once, and it was separated using jumpers. The schematic and board
have been modified. 2. During debugging, I found that the voltage received by the ADC was insufficient; this was due to insufficient voltage supplied by op-amp 1. The schematic and board have been modified. 3. For some reason, DMA channel 1 was unusable in the software, which caused me a lot
of troubleshooting QAQ.