Raspberry Pi UART Expansion Module User Manual
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SuperCapacitor on the board to keep the real time for a long time after the
Raspberry Pi has power off.
AD/DA expand module
：
The AD/DA module is specifically designed for Raspberry Pi. There is 8bit high
resolution DAC and ADC on one chip.
I2C electric level conversion expand module
：
The I2C electric level conversion module is specifically designed for Raspberry Pi.
The module convert the 3.3V of I2C electric level to 5V level or convert 5V to 3.3V.
I2C electric level conversion expand module
：
The Serial Por module is specifically designed for Raspberry Pi. The module use
Maxim MAX232 chip and DB9 port. So the user don’t need to connect Dupont Line
and that avoid wrong wiring. User can use this module to debug Raspberry Pi easily.
