4. Power anti-reverse, reverse module does not work
5. Common various models can be installed Bluetooth module, such as HC05 / 06/07 / BC04 or other compatible Bluetooth module pin definitions
6. With Clear button, you can have the key support pin module (eg HC05 / 06/07 host)
7. leads to six feet: VCC / GND / TXD / RXD / STATE / EN
8. Set the EN enable pin, floating or tied high, the module is working properly; grounding module power when turned off (after the closure of the current <20uA) to reduce power consumption
9. batch chip production factory, stable and reliable quality
Note: The default setting when connecting BC04 for hardware and as a slave, and if necessary modify the software settings for the fly line from 3.3V to PIO4
Tips: Click schematics used to provide welding pins, not less than the pin welding