MCP23017
Contents
Introduction
The number of GPIO pins on the ESP module can be expanded with a IO Expander. We will use the MCP23017 that provides 16 more pins that can be used as input or output. This way it becomes possible to control a 16 channel relay board.
Each individual pin can be used as either input or output.
Hardware
The MCP23017 needs to be connected through the I2C interface. This chip is compatible with 3V3 and it can be connected to the ESP without levelshifters..
Connections
MCP23017 ESP-01 GND GND VCC VCC SDA GPIO 0 SCL GPIO 2
Software
ESP Easy
You can control output pins on this chip with the following http command:
http://<ESP IP address>/control?cmd=mcpgpio,<pin>,0
http://<ESP IP address>/control?cmd=mcpgpio,<pin>,1
ESP Connexio
Command:
MCPWiredOut <pin nr>,<On/Off>
| Parameter: | Beschrijving: | Bereik: | Opmerking: |
|---|---|---|---|
| Pin nr | Output pin | 1 t/m 16 | |
| On/Off | Aan of Uit | On/Off |
Sample
MCPWiredOut 1,On
