So my project is a simple one:
Use sensors on side of interior garage to detect vehicle entering or leaving, then give the garage door opener a momentary button push just like the remote. SIMPLE.
The problem I am facing is, using the example Debouncer code, instead of toggling the output I would like to send a momentary pulse to then close the garage door.
I tried:
digitalWrite(ledPin, !ledState);
delay(500);
digitalWrite(ledPin, ledState);
...to "push" the button than release it. No worky.
Advice?
I am using the Example Debouncer code with the above change replacing the "toggle output" command at the end.
Below is the code (example with modification to output), sorry for the lack of information here. First post.
I have also attached a schematic of what I am trying to accomplish.
Let me know if anything else is needed for clarity.
[code]
/*
Debounce
Each time the input pin goes from LOW to HIGH (e.g. because of a push-button
press), the output pin is toggled from LOW to HIGH or HIGH to LOW. There's a
minimum delay between toggles to debounce the circuit (i.e. to ignore noise).
The circuit:
- LED attached from pin 13 to ground through 220 ohm resistor
- pushbutton attached from pin 2 to +5V
- 10 kilohm resistor attached from pin 2 to ground
- Note: On most Arduino boards, there is already an LED on the board connected
to pin 13, so you don't need any extra components for this example.
created 21 Nov 2006
by David A. Mellis
modified 30 Aug 2011
by Limor Fried
modified 28 Dec 2012
by Mike Walters
modified 30 Aug 2016
by Arturo Guadalupi
This example code is in the public domain.
https://www.arduino.cc/en/Tutorial/BuiltInExamples/Debounce
*/
// constants won't change. They're used here to set pin numbers:
const int buttonPin = 2; // the number of the pushbutton pin
const int ledPin = 13; // the number of the LED pin
// Variables will change:
int ledState = HIGH; // the current state of the output pin
int buttonState; // the current reading from the input pin
int lastButtonState = LOW; // the previous reading from the input pin
// the following variables are unsigned longs because the time, measured in
// milliseconds, will quickly become a bigger number than can be stored in an int.
unsigned long lastDebounceTime = 0; // the last time the output pin was toggled
unsigned long debounceDelay = 50; // the debounce time; increase if the output flickers
void setup() {
pinMode(buttonPin, INPUT);
pinMode(ledPin, OUTPUT);
// set initial LED state
digitalWrite(ledPin, ledState);
}
void loop() {
// read the state of the switch into a local variable:
int reading = digitalRead(buttonPin);
// check to see if you just pressed the button
// (i.e. the input went from LOW to HIGH), and you've waited long enough
// since the last press to ignore any noise:
// If the switch changed, due to noise or pressing:
if (reading != lastButtonState) {
// reset the debouncing timer
lastDebounceTime = millis();
}
if ((millis() - lastDebounceTime) > debounceDelay) {
// whatever the reading is at, it's been there for longer than the debounce
// delay, so take it as the actual current state:
// if the button state has changed:
if (reading != buttonState) {
buttonState = reading;
// only toggle the LED if the new button state is HIGH
if (buttonState == HIGH) {
ledState = !ledState;
}
}
}
// set the LED:
digitalWrite(ledPin, !ledState);
delay(500);
digitalWrite(ledPin, ledState);
// save the reading. Next time through the loop, it'll be the lastButtonState:
lastButtonState = reading;
}
[/code]
You don't have to use ledState; that part just toggles the led, something you don't need and don't want. Just place your pulse code inside the if block.
Pin2 of the Arduino will be pulled to 11.3V, it can only tolerate 5V.
At the moment the impedance of the B-E junction and the internal protection diodes of the UNO must be saving Pin2 from destruction.
Not even sure why you used a transistor, a simple potential divide would suffice.
Do you have a DMM?
Measure the volts in Pin2 when unobstructed?
Measure the 5V pin of the Arduino?
ALL with reference to the Arduino gnd.
Can you please post link to data/specs of your sensor Emitter and Receiver?
