Some resources to help you getting started with STM32 programming.
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LM3915 10-level audio level indicator kit
Power supply voltage: DC9V--12V (DC voltage)
PCB size: length 62mm * width 27mm
TIP: 560 ohms or 2.2K resistors can be soldered at 560 ohms. Which resistor is used to solder which resistor value, 2.2K will work better, J3 on the board is reserved, the role is if Display abnormal, short J3 solution, can be shorted by wire or cut off the pin, the delivery is not this component. The reference picture of our shop is welded with pin headers, which we don't care about.
Kit welding production and function demonstration video address:
Link: https://pan.baidu.com/s/17RPf2vGbo3h_ogN5qZGXMQ Password: sqtn
Reminder: This level indicator is a spare part and needs to be assembled by yourself.