1. Power supply 5V, TTL serial port control.
2. Fixed baud rate 9600bps. Fixed brightness level 7.
3. Send ASCII characters to the module to control the display. For example, send "123", send "1.23", send "7.8.9.", etc. What is sent will be displayed.
4. Do not actively send information, the TX port is reserved.
5. Regardless of the need for more flexibility, you can modify the code yourself if necessary.
Scan the QR code to follow the public account "IoT Zero Demon" and reply to "Serial Digital Tube" to obtain the source code information.
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