User Manual

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16 GND GND
17 PB5 PB5
18 PB4 ADC9
19 USB1_DM IIC_SDA_B(DM)
20 USB1_DP IIC_SCL_B(DP)
21 PB3 UART0_TXB
22 VBAT VCC
23 PB2 UART0_RXB
24 PB1 PWM2
25 PB0 PB0
26 PA9 ADC8
4. Precautions
4.1 Power supply
Power supply, try to use a clean power supply, the ripple is controlled within 30mV；
4.2 Antenna