ESP32cam add MCP23017 GPIO expander to program and add digital read/write to code
Bütçe $30-250 USD
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.
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// 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
else
[login to view URL]("Button: LOW"); // When Button is Released
delay(50);
[login to view URL]("\t");
if (val2 == HIGH) [login to view URL]("Touch Sensor: HIGH"); // If Button is Pressed
else
[login to view URL]("Touch Sensor: LOW"); // When Button is Released
delay(50);
[login to view URL]("\t");
[login to view URL]();
}
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