I have an int variable declared as global that is changed in the loop via a select case list. It only has 2 values, 1 and -1. When i change it to -1 due to a case, it reverts to 1 again before the loop is completed. Being global it 'should' retain its current value until changed again, but doesn't. The codec is long because I am using an LCD display, stepper motor, IR remote and receiver. The value of the rotationDir variable is used to preset the motor for CW or CCW rotation. Here's my tragedy...
//www.elegoo.com
//2016.12.12
// Include libraries
#include <LiquidCrystal.h>
#include "Stepper.h"
#include "IRremote.h"
#include <dht_nonblocking.h>
// Define types
#define STEPS 32 // Number of steps per revolution of Internal shaft
#define DHT_SENSOR_TYPE DHT_TYPE_11
/*----- Variables, Pins -----*/
const int receiver = 12; // Signal Pin of IR receiver to Arduino
static const int DHT_SENSOR_PIN = 14; //Signal pin of DHT sensor
const int stepsPerRev = 2048;
const int Position1 = 0;
const int Position2 = 100;
const int Position3 = 950;
const int Position4 = 1500;
const int Position5 = 1700;
const int Position6 = 2000;
int rotationDir = 1; //Start with anticlockwise rotation
int startPosition = 0; //Keeps count of the absolute position of the turntable. Movement works with positionDelta from this count.
int newPosition = 0; // Radial position to advance to
int wasPosition = 0; // Radial position currently occupied. is copied from newPosition once the motor starts moving
int positionDelta = 0; // How far to move from current position to the next
int setPosition; // Distance to home
/*-----( Declare objects )-----*/
// Setup of proper sequencing for Motor Driver Pins
// In1, In2, In3, In4 in the sequence 1-3-2-4
Stepper small_stepper(STEPS, 2, 4, 3, 5);
IRrecv irrecv(receiver); // create instance of 'irrecv'
decode_results results; // create instance of 'decode_results'
DHT_nonblocking dht_sensor( DHT_SENSOR_PIN, DHT_SENSOR_TYPE ); // Call non-blocking type for Humdity & Temperature sensor
LiquidCrystal lcd(6, 7, 8, 9, 10, 11); // initialize the library with the numbers of the lcd interface pins
void setup()
{
irrecv.enableIRIn(); // Start the receiver
Serial.begin(9600);
Serial.println("Ready"); // Signal that the program is working
small_stepper.setSpeed(200); //Max is 500
lcd.begin(16, 2); // set up the LCD's number of columns and rows:
}
/*---- Take measurements every 4 seconds in the background ----*/
static bool measure_environment( float *temperature, float *humidity )
{
static unsigned long measurement_timestamp = millis( );
if ( millis( ) - measurement_timestamp > 9000ul )
{
if ( dht_sensor.measure( temperature, humidity ) == true )
{
measurement_timestamp = millis( );
return ( true );
}
}
return ( false );
}
void loop()
{
float temperature;
float humidity;
if ( measure_environment( &temperature, &humidity ) == true )
{
lcd.setCursor(0, 0);
lcd.print( "T=" );
lcd.print( temperature, 1 );
lcd.print( " C H=" );
lcd.print( humidity, 0 );
lcd.print( "%" );
Serial.print( "T=" );
Serial.print( temperature, 1 );
Serial.print( "C H=");
Serial.print( humidity, 1 );
Serial.println( "%" );
}
if (irrecv.decode(&results)) // have we received an IR signal?
{
Serial.print("Input received "); Serial.println(results.value);
switch(results.value)
{
case 0xFF629D: positionDelta = -stepsPerRev / 2; Serial.println("Go about clockwise"); break; //VOL+
case 0xFF22DD: positionDelta = 128 * rotationDir; Serial.println("Small correction"); break; //Fast Back
case 0xFFC23D: positionDelta = 64 * rotationDir; Serial.println("Smaller correction"); //Fast Forward
case 0xFFE01F: rotationDir = -1; Serial.println("Preset clockwise rotation"); break; //DOWN
case 0xFFA857: positionDelta = stepsPerRev / 2; Serial.println("Go about anticlockwise"); break; //VOL-
case 0xFF906F: rotationDir = 1; Serial.println("Preset anticlockwise rotation"); break; //UP
case 0xFFB04F: startPosition = 0; Serial.println("Reset start Position"); setPosition=0; break; //ST/RPT
case 0xFF6897: newPosition = 0; Serial.println("Going home"); setPosition = 0; break; // Return to start position break;
case 0xFF30CF: newPosition = Position1; Serial.println("Position 1"); setPosition = 1; break;
case 0xFF18E7: newPosition = Position2; Serial.println("Position 2"); setPosition = 2; break;
case 0xFF7A85: newPosition = Position3; Serial.println("Position 3"); setPosition = 3; break;
case 0xFF10EF: newPosition = Position4; Serial.println("Position 4"); setPosition = 4; break;
case 0xFF38C7: newPosition = Position5; Serial.println("Position 5"); setPosition = 5; break;
case 0xFF5AA5: newPosition = Position6; Serial.println("Position 6"); setPosition = 6; break;
case 0xFFFFFFFF: Serial.print(results.value); Serial.println(" REPEAT");break;
default:
Serial.println(" other button : ");
Serial.println(results.value);
}// End Case
Serial.print("Rotation "); Serial.println(rotationDir);
Serial.print("New position "); Serial.println(newPosition);
Serial.print("Old position "); Serial.println(wasPosition);
if (!positionDelta) positionDelta = newPosition - wasPosition;
Serial.print("Position change "); Serial.println(positionDelta);
startPosition = startPosition + positionDelta;
if(startPosition > stepsPerRev) startPosition = startPosition - stepsPerRev;
Serial.print("Steps to home "); Serial.println(startPosition);
lcd.setCursor(0, 1);
lcd.print("Pos: ");
lcd.print(setPosition);
lcd.setCursor(8, 1);
if (rotationDir = 1) lcd.print("CCW");
else
if (rotationDir = -1) lcd.print("CW");
small_stepper.step(positionDelta);
wasPosition = newPosition;
newPosition = 0;
positionDelta = 0;
digitalWrite(2, LOW);
digitalWrite(3, LOW);
digitalWrite(4, LOW);
digitalWrite(5, LOW);
}
results.value = 0;
irrecv.resume(); // receive the next value
delay(500); // de-bounce
}/* --end main loop -- */I can't find a stepwise debug tool in my IDE Arduino 1.8.19 so if there's another approach or IDE i can use i'd be grateful for the help. I'm happy to use use a bool variable but the if test will be a doosey.
