Hello everybody. I have a project running with an arduino mega, cnc shield, grbl, and I want to be able to control the Z-axis homing with LDR MODULE, can i connect the LDR to one of the free pins and add a function with the grbl library. and use it as homing for the z-
axis
something like this :
#include <GRBL.h>
// Define the pin numbers for the LDR and the Z-axis motor control
const int ldrPin = A0; // Analog pin for LDR
const int zStepPin = 2; // Step pin for Z-axis motor control
const int zDirPin = 5; // Direction pin for Z-axis motor control
// Define the threshold value for the LDR
const int threshold = 500; // Adjust this value based on your LDR readings
void setup() {
// Initialize the serial communication for debugging
Serial.begin(115200);
// Initialize the CNC shield and GRBL
grblInit();
// Set the Z-axis motor control pins as outputs
pinMode(zStepPin, OUTPUT);
pinMode(zDirPin, OUTPUT);
}
void loop() {
// Read the value from the LDR
int ldrValue = analogRead(ldrPin);
// Move the Z-axis motor until the LDR value reaches the threshold
if (ldrValue < threshold) {
// Rotate the motor in one direction (e.g., clockwise)
digitalWrite(zDirPin, HIGH);
digitalWrite(zStepPin, HIGH);
delay(5); // Adjust the delay as per your motor speed
digitalWrite(zStepPin, LOW);
delay(5); // Adjust the delay as per your motor speed
} else {
// Stop the motor when the threshold is reached
digitalWrite(zStepPin, LOW);
}
// Print the LDR value for debugging
Serial.println(ldrValue);
// Run the GRBL loop
grblUpdate();
}
