There is a device on the board. I don't know what it is. It says BU257. It is a 16-pin 8*2 chip. I googled it but still couldn't find any useful information. If anyone knows, please tell me. Thanks.
Dear experts, please help me choose a voltage comparator. Its function is to detect that the voltage at the capacitor end is equal to the reference voltage of the comparator, so that the trigger circu
After posting 500 boards and shipping over 200 devices recently, 6 boards had to be repaired with 0.1uf capacitor failures (in different locations, both in the reset circuit and the filter circuit).
T
After several days of experiments, I was finally able to parse some key data normally. I took some detours. At the beginning, I did not register the interrupt in the startup file, so the interrupt cou