ESP32cam add MCP23017 GPIO expander to program and add digital read/write to code

Using this tutorial as a base for the project - [login to view URL] - update to use a MCP23017 GPIO expander (I2C device) - and add digital read/write to code.

Using the adafruit MCP23017 ("Adafruit_MCP23017.h") library (and wire.h or similar library if needed to map I2C pins).

Using this board - [login to view URL] .

Need to map I2C (SDA and SCL pins - suggested using pins 12/SDA and 14/SCL - or other suitable/available pins on the esp32cam - I should not have to do any soldering - or modifications to board!!)

Note - I do not need physical device made or anything else - just code!!

Need to use Arduino IDE - so similar language as tutorial: [login to view URL]

MUST update tutorial code to add digital read/write to MCP23017 ... see sample read/write code below.

Must be able to view webcam and do digital read/write.


// Test circuit for esp32cam

// and MCP23017 GPIO Expander

// Standard SDA is 21 and SCL is 22

// Use wire.h to change SDA SCL pins...

// When Flashing - put USB SDA SCL pins for esp32 on SDA 21 and SCL 22

// When Flashing - put USB on standard flashing pins...

#include <Wire.h> // set [login to view URL](SDA, SCL)

#include "Adafruit_MCP23017.h"

Adafruit_MCP23017 mcp; // Instantiate mcp object

int dly = 500; // 1/4 second delay

void setup(){

[login to view URL](115200);

[login to view URL]("Setup starting: Ready");

[login to view URL](12, 14); // NOTE '//' out [login to view URL] in [login to view URL] library! Or will not map pins!!

[login to view URL](); // "Start" the mcp object

[login to view URL](0, OUTPUT); // relay

[login to view URL](1, INPUT); // push button - green

[login to view URL](1, HIGH); // turn on a 100K pullup internally

[login to view URL](2, INPUT); // touch sensor - filzer custom

[login to view URL](2, HIGH); // turn on a 100K pullup internally


void loop(){

// Digital write test - for Relay testing

[login to view URL]("Relay - Flashing GPIO: "); // Tell us what pin is flashing.

[login to view URL](0, HIGH); // Set pin HIGH (on)

delay(dly); // On for 1/4 second

[login to view URL](0, LOW); // Set pin LOW (off)

delay(dly); // Off for 1/4 Second

// digit read test - for push buttons x2

int val1 = [login to view URL](1); // Read the value of pin P1

int val2 = [login to view URL](2); // Read the value of pin P2

if (val1 == HIGH) [login to view URL]("Button: HIGH"); // If Button is Pressed


[login to view URL]("Button: LOW"); // When Button is Released


[login to view URL]("\t");

if (val2 == HIGH) [login to view URL]("Touch Sensor: HIGH"); // If Button is Pressed


[login to view URL]("Touch Sensor: LOW"); // When Button is Released


[login to view URL]("\t");

[login to view URL]();


Beceriler: Arduino, Mikrodenetleyici, Elektronik, Gömülü Yazılım, C Programlama

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( 1 değerlendirme ) Halifax, Canada

Proje NO: #23190812



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