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Posted: 05/07/2021
ESP8266 Pin Description
| Pin | High Status | Low Status | Note |
| VCC, GND | Use standalone power source, or large capacitor, all power of this module from external | ||
| UTXD, URXD | The serial port | ||
| RST | - | restart | |
| CH_PD | Flash boot and Update Mode | - | chip enable, so always connect to high status with VCC |
| GPIO0 | - | Update mode | |
| GPIO2 | - | - | |
* No need any pull-up
