# ESP8266 (ESP01, ESP01-S)

De ESP8266 is een goedkope microprocessor met Wi-Fi mogelijkheid en een volledige TCP/IP stack. De ESP8266 is ontwikkeld en wordt geproduceerd door de Chinese fabrikant Espressif Systems uit Shanghai.

[![esp01-esp01s.jpg](https://www.linuxfun.nl/uploads/images/gallery/2023-09/scaled-1680-/esp01-esp01s.jpg)](https://www.linuxfun.nl/uploads/images/gallery/2023-09/esp01-esp01s.jpg)

[![ESP-01-ESP8266-pinout-gpio-pin.png](https://www.linuxfun.nl/uploads/images/gallery/2023-09/scaled-1680-/esp-01-esp8266-pinout-gpio-pin.png)](https://www.linuxfun.nl/uploads/images/gallery/2023-09/esp-01-esp8266-pinout-gpio-pin.png)

#### **ESP8266 Pin Configuration**

<figure class="wp-block-table" id="bkmrk-pin-number-pin-name-"><table><tbody><tr><td>**Pin Number**</td><td>**Pin Name**</td><td>**Alternate Name**</td><td>**Normally used for**</td><td>**Alternate purpose**</td></tr><tr><td>1</td><td>**Ground**</td><td>–</td><td>Connected to the ground of the circuit</td><td>–</td></tr><tr><td>2</td><td>**TX**</td><td>GPIO – 1</td><td>Connected to Rx pin of programmer/uC to upload program</td><td>Can act as a General purpose Input/output pin when not used as TX</td></tr><tr><td>3</td><td>**GPIO-2**</td><td>–</td><td>General purpose Input/output pin</td><td>–</td></tr><tr><td>4</td><td>**CH\_EN**</td><td>–</td><td>Chip Enable – Active high</td><td>–</td></tr><tr><td>5</td><td>**GPIO – 0**</td><td>Flash</td><td>General purpose Input/output pin</td><td>Takes module into serial programming when held low during start up</td></tr><tr><td>6</td><td>**Reset**</td><td>–</td><td>Resets the module</td><td>–</td></tr><tr><td>7</td><td>**RX**</td><td>GPIO – 3</td><td>General purpose Input/output pin</td><td>Can act as a General purpose Input/output pin when not used as RX</td></tr><tr><td>8</td><td>**Vcc**</td><td>–</td><td>Connect to +3.3V only</td><td> </td></tr></tbody></table>

<figcaption>Pin Configuration</figcaption></figure>#### Shop

[AliExpress](https://nl.aliexpress.com/item/32582736130.html?spm=a2g0s.9042311.0.0.27424c4d19rHNI)