What is it?

Wi-Fi module is used for Wi-Fi connection with your server and sending/receiving data with BigClown IoT platform. Wi-Fi connectivity is missing in the offer of BigClown. If you use Wi-Fi module and Wi-Fi connectivity is enough for your project, you can use Core module without Radio and save 10 euros. Core module controls ESP8266 by AT commands by UART. The one big advantage is connector for sensors - you can use TAG by BigClown or 4-pins, 5-pins sensor like Si7021, BME280, BMP180 and much more. The pinout of sensor and TAG has to be: VCC (or GND); GND (or VCC); SCL; SDA; INT. The switching between VCC and GND on connector is choosen by soldering bridges. The pin header which you may use is in SMT (like BigClown) or THT. Both of them can be assembled. This ESP8266 Wi-Fi module is supported by SDK of BigClown, so you just use existing functions.

What ESP8266 module may I use?

That's second advantage - you can use ESP07, ESP08, ESP12E of ESP12F. It is depending on you and your project.

How to start

At first, you have to solder four soldering bridges - UART TX, UART RX, CH PD, RESET. UART TX - choose UART0 or UART1 which will be connected to RX of ESP8266. UART RX - choose UART0 or UART1 which will be connected to TX of ESP8266. CH PD - enabling of ESP8266 - GPIO P6 or P7. RESET - reset of ESP8266 - GPIO P8 or P9.

I2C connector

Wi-Fi module contains connector for connecting of Sensor. The design of connector is variable and you can modify pinout of connector easily by soldering bridges. PWR2 - choose VCC (3.3V) or GND on the first pin of connector PWR1 - choose VCC (3.3V) or GND on the second pin of connector Then SCL and SDA are connected to SCL0 (pin 17 and 18) and if the sensor includes INT pin, it is connected to INT of Core module (pin 19).

PCB

The PCB is two layers and components are from both sides.

BOM - what components you need

The headers can be used SMT or THT.

How does it look after soldering