Steppermotor with 2 LDR

Projects Programming
1

How can I write a code with 2 LDR with stepper motor. When the first LDR gets more light, the motor rotates to the left with 1 steps. When the second LDR gets more light, the motor rotates to the right with 1 steps. The motor can rotate 500 steps to the right and to the left. When to stepper motor has rotated all the way to the right , the arduino must stop and go all the way back to the starting position.. Every 5 seconds the arduino must check wich LDR got the most light and rotate in the right direction like a solar tracker.
Can onyone help me?

2

I the same way you eat an elephant - one small piece at a time.
Don't forget to add debug code to help tell you what the code is doing.

Do the motors have limit switches?

3

@anon56112670 this is the code that I wrote, but it won't work.

#include <Stepper.h>

// Define constants for the number of steps per revolution, the number of LDRs, and the LDR pins
const int stepsPerRevolution = 2048;
const int numLDRs = 2;
const int LDRPins[numLDRs] = {A0, A1};
const int maxSteps = 500;

// Initialize the stepper motor with the number of steps and the motor pins
Stepper myStepper(stepsPerRevolution, 8, 9, 10, 11);

void setup() {
// Set the LDR pins as inputs
for (int i = 0; i < numLDRs; i++) {
pinMode(LDRPins[i], INPUT);
}
}

void loop() {
// Read the LDR values
int LDRValues[numLDRs];
for (int i = 0; i < numLDRs; i++) {
LDRValues[i] = analogRead(LDRPins[i]);
}

// Determine which LDR has the most light and rotate the motor in the appropriate direction
if (LDRValues[0] > LDRValues[1]) {
myStepper.step(-1);
} else {
myStepper.step(1);
}

// Check if the motor has rotated the maximum number of steps and rotate back to the starting position if it has
if (myStepper.currentPosition() >= maxSteps || myStepper.currentPosition() <= -maxSteps) {
myStepper.step(-myStepper.currentPosition());
}

// Wait for 5 seconds
delay(5000);
}

4

^^^This^^^

5

rror: 'class Stepper' has no member named 'currentPosition if (myStepper.currentPosition() >= maxSteps || myStepper.currentPosition() <= -maxSteps) {

error: 'class Stepper' has no member named 'currentPosition'
if (myStepper.currentPosition() >= maxSteps || myStepper.currentPosition() <= -maxSteps) {

error: 'class Stepper' has no member named 'currentPosition'
myStepper.step(-myStepper.currentPosition());

Compilation error: 'class Stepper' has no member named 'currentPosition'

6

You said that it didn't work, not that it didn't compile.

Ok, when you've corrected that and got the code to compile don't forget to add some debug code to help tell you what the code is doing

7

consider

#include <Stepper.h>

const int stepsPerRevolution = 2048;
Stepper myStepper (stepsPerRevolution, 8, 9, 10, 11);

const int numLDRs = 2;
const int LDRPins[numLDRs] = {A0, A1};
char s [80];

// -----------------------------------------------------------------------------
void loop ()
{
    int ldr0 = analogRead (LDRPins[0]);
    int ldr1 = analogRead (LDRPins[1]);

    int err = ldr0 - ldr1;
    if (2 < abs(err))
        err /= abs (err);
    else
        err = 0;

    myStepper.step (err);

    sprintf (s, " %2d - %6d, %6d", err, ldr0, ldr1);
    Serial.println (s);

    delay (1000);
}

void setup () {
    Serial.begin (9600);
}
8

Alright

How would you make the code

9

Also, ^^^this^^^

10

What do you mean by that

The motor can rotate Max with 500 steps to the right and left

11

Is this a real-world stepper motor, or an assignment simulation imaginaries motor?

12

Its a real World motor

13

So, when you turn the power off when the motor reached step 231, how does it know where home is?

14

How will your program know that it can rotate the motor 500 steps if it does not know the step number it starts from?

15

why would you need limit switches if the motor can rotate in the direction of the light it is tracking. (ignoring a startup condition. is there some minimum light level that must be some minimum light level for it to run)?

16

So you can send it home at the end of the day, ready for the next day.

17

Exactly

18

really ?? not helpful

19

Yea it needs to be a kind of solar tracker

20

there was a thread like this not long ago.

his problem was recognizing "night" and rotating the motor back to an initial morning position