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In recent years the ESP8266 has become one of my go-to choices for smart home/IoT devices or projects requiring WiFi. It is cheap (around $1.5 on Amazon)1, has WiFi, and can be programmed using the Arduino IDE, making it an easy replacement for Arduinos if we need WiFi connectivity.

While the ESP8266 can be used with the original AT firmware as a WiFi module for other microcontrollers like an Arduino, we will concentrate on writing our own replacement firmware in this post. Our firmware lets us replace the Arduino with an ESP module, simplifying programming and assembly and reducing cost.

Although the information in this article can be found in the ESP's datasheet, on several other sources online, or by measuring an ESP module, we want to mention the ESP8266 reference provided by Stefan Frings [1].

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Sebastian Hirnschall
Article by: Sebastian Hirnschall
Updated: 25.06.2023


Visited on 26.06.2023:
[1] Stefan Frings: ESP8266 und ESP8285 WLAN Module
[4] Erik H. Bakke: ESP8266 WiFi power reduction – Avoiding network scan, 2017
[5] Erik H. Bakke: Reducing WiFi power consumption on ESP8266, part 1, 2017
[6] Erik H. Bakke: Reducing WiFi power consumption on ESP8266, part 2, 2017
[7] Erik H. Bakke:Reducing WiFi power consumption on ESP8266, part 3, 2017
[8] Espressif: ESP8266ex datasheet
[9] Espressif: ESP8285ex datasheet
[10] AI-Thinker: ESP-01/07/12 Series Molules User's Manual, v1.3, 2017
[11] AZ-Delivery: ESP8266-01S Modul Datenblatt
[12] Doit: ESP-1 WiFi Module, v1.0, 2017
[13] Michel Deslierres: ESP8266 Watchdogs in Arduino, 2017
[14] Espressif: ESP8266 Hardware Design Guide, 2023


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