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ESP8266 serial ESP-01 WIFI Wireless Transceiver Module - IOT

160

SP8266 usually comes assembled on a board, the most popular ones having been the ESP-NN by vendors such as AIThinkers. Olimex has also started to sell their own boards, and you can find several others too. The boards integrate an ESP8266 chip plus a Flash memory chip (Flash RAM), a crystal, and usually on on-board WiFi antenna. The Flash RAM size and chip model can vary.

  • ESP8266 chip only uses 3.3V for power and I/O.
  • Wi-Fi Direct (P2P), soft-AP
  • low cost WiFi module suitable for adding WiFi functionality to an existing microcontroller project via a UART serial connection.

ESP8266 usually comes assembled on a board, the most popular ones having been the ESP-NN by vendors such as AIThinkers. Olimex has also started to sell their own boards, and you can find several others too. The boards integrate an ESP8266 chip plus a Flash memory chip (Flash RAM), a crystal, and usually on on-board WiFi antenna. The Flash RAM size and chip model can vary.

Among the ESP-XX boards, the most notable to get started is the ESP-01, which has a male 2×4 0.1“ pitch connector that can be readily used with Dupont wires. This board exposes serial communication pins (RX/TX), and the minimal 4 control pins, GPIO0, GPIO2, CH_PD and ReSeT, plus VCC and GND of course. With this board you will have very limited access to all-purpose GPIOs. It also has an on-PCB Wifi Antenna etched on the PCB, which has sufficient gain for shorter range applications. Note that the ESP-01 connector on its own cannot straddle the two sides of a standard breadboard.

The other ESP-NN modules expose more GPIO pins, but are packaged in SMT packages, at best with a 2mm-pitch notches. Some modules have etched antenna, some have ceramic antenna, and some have just a socket or a pin. A favorite for that is the ESP-07, which has a shield (with FCC marking, but probably not registered at FCC).

 

Basic wiring:

So, let's assume that you have:

an ESP-01

a USB/TTL converter

a 3.3V power supply

a breadboard and Dupont wires

1k and 2.2K resistors

Note that some USB UART adapters internal 3.3v supply are rated at 1A and can therefore provide enough current to power the ESP8266, but in general an external 3.3v power supply is recommended.

Looking at the (8 pin) board from the top (chips and antenna side), with the antenna to the right, the pins from the top down in the edge row are:

TXD (goes to the 3.3V RxI of the UART USB adapter to the PC)

CH_PD (enable/power down, must be pulled to 3.3v directly or via resistor)

REST (reset, must be pulled to 3.3v)

VCC (3.3v power supply)

The inner row (top and bottom have square pads)

GND (connect to power ground)

GPIO 2

GPIO 0 (leave open or pull up for normal, pull down to upload new firmware)

RXD (goes to the 3.3V TxO of the UART USB adapter to the PC)

SP8266 usually comes assembled on a board, the most popular ones having been the ESP-NN by vendors such as AIThinkers. Olimex has also started to sell their own boards, and you can find several others too. The boards integrate an ESP8266 chip plus a Flash memory chip (Flash RAM), a crystal, and usually on on-board WiFi antenna. The Flash RAM size and chip model can vary.

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