How to use MCP2317 module with WEMOS MINI D1

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 The MCP2317 is a 16-bit I/O expander that can be controlled via the SPI protocol. The Wemos D1 mini is a development board based on the ESP8266 WiFi module, which also has support for SPI communication.

To use the MCP2317 with the Wemos D1 mini, you will need to connect the two devices together using the SPI interface. Here's how you can do it:

  1. Connect the VDD pin of the MCP2317 to the 3.3V pin of the Wemos D1 mini.
  2. Connect the GND pin of the MCP2317 to the GND pin of the Wemos D1 mini.
  3. Connect the SCK pin of the MCP2317 to the D5 pin of the Wemos D1 mini.
  4. Connect the MOSI pin of the MCP2317 to the D7 pin of the Wemos D1 mini.
  5. Connect the MISO pin of the MCP2317 to the D6 pin of the Wemos D1 mini.
  6. Connect the CS pin of the MCP2317 to the D8 pin of the Wemos D1 mini.

Once you have made the necessary connections, you can use a library like the "SPI.h" library in the Arduino IDE to communicate with the MCP2317. Here's an example code to get you started:

C++
#include <SPI.h>
#include <Adafruit_MCP23X17.h> 
#define MCP2317_CS D8 // Replace with the CS pin you used 
#define MCP2317_ADDRESS 0x20 // Replace with the address of your MCP2317 
 Adafruit_MCP23X17 mcp; 
void setup() { 
 SPI.begin(); 
 mcp.begin(MCP2317_ADDRESS, &SPI, MCP2317_CS); 
 mcp.pinMode(0, INPUT); 
 mcp.pullUp(0, HIGH);
} 
void loop() { 
// Read the value of MCP2317 input pin 0 
bool input = mcp.digitalRead(0);

  // Do something with the input value 
if (input) { 
// Pin 0 is high 
 }
else 
{ 
// Pin 0 is low 
 } 
}

This code initializes the SPI interface and the MCP2317 using the Adafruit_MCP23X17 library. It sets pin 0 of the MCP2317 to input mode and enables the internal pull-up resistor. In the loop, it reads the value of pin 0 and does something based on the value. You can modify it to suit your needs by setting other pins to input or output mode and writing values to the output register instead.

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