Any input voltage greater than 3.3V will damage the module! To program settings on the ESP8266, we’ll first need to connect it to a serial terminal on a computer through which we can send it special commands. Note that the maximum voltage input for the ESP8266 is 3.3V. TX : UART serial communication transmit pin VCC : Connection to 3.3V Vcc (Vcc cannot exceed 3.3V!) GPIO 1 : GPIO pin (unused in this project) GPIO 0 : GPIO pin (unused in this project) RX : UART serial communication receive pin The pinout for the ESP8266’s pins is according to the following diagram:įigure 2. For prototyping, I chose to just use jumper wires. If you’d like to make your prototyping more compact, you can also purchase breadboard breakouts for the ESP8266 such as this one. This means that to prototype projects on a breadboard, you’ll need male-female jumper wires to connect the pins on the ESP8266 to rows on the breadboard. The module has 8 pins that serve different functions, but they are packed in a 4×2 arrangement that makes plugging the module into a breadboard impossible. The first feature to notice about the ESP8266 is its awkwardly spaced header pins.
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