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8
4 Recommended Connection Diagram
No
A brief description of the connection between the module and the microcontroller (the above figure takes
the STM8L microcontroller as an example)
1
The wireless serial port module is TTL level, please connect it with TTL level MCU .
2
For some 5V microcontrollers, it may be necessary to add 4 ~ 10K pull-up resistors to the TXD and
AUX pins of the module.
3
It is recommended to add a TVS diode before the power supply of the E22-230/400T33E module to
prevent the instantaneous voltage from being too high, thus burning the chip.
