1. Power input terminal, input voltage range 5.5V - 12V (5V power supply, connect directly to terminal 2); 10. Power indicator LED; 2. 5V power supply input terminal (both terminals 1 and 2, connect only one); 11. JTAG interface, designed according to -V8 or V9 definitions; 3. STM32F103C8T6 GPIO pinout for easy secondary development, silkscreen directly corresponds to the chip's pin numbers;12. Not marked; 4. new original main control MCU: STM32F103C8T6; 13. STM32F103C8T6 reset button; 5. 2.5V reference, high accuracy, low temperature drift; 14. USB to TTL connector, corresponding to the MCU's TX, RX, and GND, allowing direct communication with a computer;6. Adjustable potentiometer, adjustable output voltage connected to AIN0/ 15. Original 3232 serial communication chip; 7. 8 channels for data acquisition: I0-I7 connect to the positive terminal of the acquired voltage, G is analog ground, connect to the negative terminal of the acquired voltage; 16. Serial connector, female; 8. Input filtering and attenuation resistors: no attenuation is performed by default, but there is space for soldering attenuation resistors 17. On/off control of the adjustable potentiometer output voltage to I0/AIN0: disconnect IO and leave it floating; connect I0 to measure the adjustable potentiometer output voltage terminal; 9. ADS1256IDB data acquisition chip, new original ; 18. STM32 BOOT0 and BOOT1 selection control jumper; Color: Blue Material: Plastic+Metal Package Contents: 1 Pcs ADS1256 24-bit AD module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.