![]() ![]() Incoming serial data at 5V or 3V level. If your data source is microcontroller, then you can connect its TXD pin to RX-IN of the board directly. If your data is at RS232 level data is use a MAX232 to convert that data to 5V UART suitable for board. ![]() Typically connected to RXD pin of microcontroller or MAX232 or USB-TTL. Board has LM1117-3.3V regulator to power all parts. Provide regulated +5V DC voltage to this pin for board operation. ![]() When USB Drive is inserted, it automatically mounts and red error led will switch off and yellow will come on.
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