5/28/2023 0 Comments Blue pill schematicST-Link header on the top of the board.It's currently very popular with retailers, and it costs about $2. It's one of the cheap STM32F103 boards that can be found from Chinese retailers. The name on the forum for these boards is a reference to the Matrix and comes from this thread on the forum. It is also true that some PCs are tolerant of incorrect value so, before you change the resistance, you can try if it works in your case. It ships with either a 10 kΩ resistor or a 4.7 kΩ resistor, but it should be replaced with a 1.5 kΩ resistor, or put an appropriate resistor value (e.g 1.8 kΩ) in between PA12 and 3.3V. The USB standard requires a 1.5 kΩ pullup resistor on D+, but this board is known to have a wrong value (R10 on the board).
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