Jeff Habibi iceberg1369
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| defualt data mode baud rate is 9600 or 4800 | |
| first enable AT command mode | |
| pull up EN(KEY) to VCC and then turn on device | |
| # some times you have to keep button pushed so that AT commands works in AT mode! | |
| the device should blink every 2 second | |
| in arduino IDE | |
| baud rate 38400 |