Quote:
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Originally Posted by aerohead
which, when de-energized, is spooled backwards under spring tension at the shutters? With 'fail-wide-open' safety protection?
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From what I have seen and read thus far, there does not seem to be fail-safe OPEN mechanism in current grille shutters. I could be wrong though...In their OEM state, all they do is throw a CEL code if there is an issue.
As it stands, there is no spring tension to accommodate a fail-OPEN state, as it would be difficult to use with a servo motor.
Quote:
Originally Posted by Piwoslaw
Nice!
Now I am interested in how the Arduino will control it.
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The arduino control code will evolve over time. For the time being, given my limited coding knowledge, it will be pretty basic.
I managed to integrate a micro switch to detect the shutter position. A 1602 LCD was also integrated to monitor the OPEN/SHUT status.
Things I want to integrate into the code, eventually :
- Coolant temperature
- Ambient temperature
- Rain/Snow sensor
Below is the LCD display and microswitch in action.
Arduino Code :
PHP Code:
#include <Servo.h>
#include <ezButton.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 column and 2 rows
// constants
const int BUTTON_PIN = 7; // Arduino pin connected to button's pin
const int SERVO_PIN = 9; // Arduino pin connected to servo motor's pin
const int LED_PIN = 2; // green LED connected to digital pin 2
const int POS_SWITCH = 4;
Servo servo; // create servo object to control a servo
// variables
int angle = 0; // the current angle of servo motor
int lastButtonState; // the previous state of button
int currentButtonState; // the current state of button
int val = 0; // variable to store the read value
void setup() {
Serial.begin(9600); // initialize serial
pinMode(BUTTON_PIN, INPUT_PULLUP); // set arduino pin to input pull-up mode
pinMode(LED_PIN, OUTPUT);
pinMode(POS_SWITCH, INPUT);
servo.attach(SERVO_PIN); // attaches the servo on pin 9 to the servo object
servo.write(angle);
lcd.init(); // initialize the lcd
lcd.backlight();
}
void loop() {
lastButtonState = currentButtonState; // save the last state
currentButtonState = digitalRead(BUTTON_PIN); // read new state
if(lastButtonState == HIGH && currentButtonState == LOW) {
digitalWrite(LED_PIN, HIGH); // turn the LED on (HIGH is the voltage level)
delay(1000); // wait for a second
digitalWrite(LED_PIN, LOW); // turn the LED off (LOW is the voltage level)
delay(500); // wait for a 0.5 second
// change angle of servo motor
if(angle == 0)
angle = 90 ;
else
if(angle == 90)
angle = 0;
servo.write(angle); // control servo motor arccoding to the angle
}
delay(1000); // wait for a second
val = digitalRead(POS_SWITCH); // read the input pin
if(val == HIGH){
lcd.clear(); // clear display
lcd.setCursor(0, 0); // move cursor to (0, 0)
lcd.print(" GRILLE SHUTTER"); // print message at (0, 0)
lcd.setCursor(2, 1); // move cursor to (2, 1)
lcd.print(" [ SHUT ]"); // print message at (2, 1)
}
else {
lcd.clear(); // clear display
lcd.setCursor(0, 0); // move cursor to (0, 0)
lcd.print(" GRILLE SHUTTER"); // print message at (0, 0)
lcd.setCursor(3, 1); // move cursor to (2, 1)
lcd.print(" [ OPEN ]"); // print message at (2, 1)
}
}
Cheers !