ESP-12E I2C Base Card

As a follow-up on the ESP-12E Card, today we will look at the prototype base card that this was designed to slot into – The ESP-12E I2c Base Card.

Initial Features ( To be expanded in future versions )

4 x 40Pin Expansion slots, with access to 12v, 3.3v and Gnd on each slot.

2 x “IRQ” pins per slot ( serviced by a single PCF8574 )

I2C bus access on each slot (3.3v )

UART Header

Reset and Flash Header

GPIO Header ( Direct access to the ESP-12E GPIO Pins )

Analog Input Header (a Single input – A0, as per ESP-12E limitation)

Buck Converter Power Supply Module, capable of up to 2A of current

ESP-12E I2C Base Card – Top view

The Schematic

Schematic

The PCB – some pictures

PCB Top

PCB Bottom

With ESP-12E Card

With ESP-12E Card