Hello everyone, I am working on a project that I have to NOT USE DELAY I picked Blink W/O delay as a starting point. (Because millis is new to me) However, I will be using a PIR as a trigger. The PIR has (2) pots on it. One is to adjust the sensitivity (Distance), and the other is to adjust the length of time the PIR puts out a digital signal when someone walks by. That's anywhere from 2 seconds to give or take 3 minutes. Which makes this even more complex. The project is battery powered. So instead of the PIR signal outputting for 3 minutes, I would simply like to use it a a "Trigger", meaning a 2 second HIGH OUTPUT from the PIR would allow me to BLINK the LED for as long as I like. I am in hope that someone can walk me through the correct process to accomplish this task, Thanks in advance. It still blinks, but not on the basis of the PIR signal.
/*
Blink without Delay
Turns on and off a light emitting diode (LED) connected to a digital pin,
without using the delay() function. This means that other code can run at the
same time without being interrupted by the LED code.
The circuit:
- Use the onboard LED.
- Note: Most Arduinos have an on-board LED you can control. On the UNO, MEGA
and ZERO it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN
is set to the correct LED pin independent of which board is used.
If you want to know what pin the on-board LED is connected to on your
Arduino model, check the Technical Specs of your board at:
https://www.arduino.cc/en/Main/Products
created 2005
by David A. Mellis
modified 8 Feb 2010
by Paul Stoffregen
modified 11 Nov 2013
by Scott Fitzgerald
modified 9 Jan 2017
by Arturo Guadalupi
This example code is in the public domain.
https://www.arduino.cc/en/Tutorial/BuiltInExamples/BlinkWithoutDelay
*/
// constants won't change. Used here to set a pin number:
const int ledPin = LED_BUILTIN;// the number of the LED pin
const int PIR_PWR = 7;
const int PIR_READ = 12;
int val = 0;
// Variables will change:
int ledState = LOW; // ledState used to set the LED
// Generally, you should use "unsigned long" for variables that hold time
// The value will quickly become too large for an int to store
unsigned long previousMillis = 0; // will store last time LED was updated
// constants won't change:
const long interval = 1000; // interval at which to blink (milliseconds)
void setup() {
// set the digital pin as output:
pinMode (ledPin, OUTPUT);
pinMode (PIR_PWR, OUTPUT);
pinMode (PIR_READ, INPUT);
}
void loop() {
digitalWrite (PIR_PWR, HIGH);
val = digitalRead (PIR_READ); // read the input pin
digitalWrite (ledState, val);
// here is where you'd put code that needs to be running all the time.
// check to see if it's time to blink the LED; that is, if the difference
// between the current time and last time you blinked the LED is bigger than
// the interval at which you want to blink the LED.
unsigned long currentMillis = millis();
//if (val = digitalRead (PIR_READ); // read the input pin
// digitalWrite (ledState, val));
if (currentMillis - previousMillis >= interval) {
// save the last time you blinked the LED
previousMillis = currentMillis;
// if the LED is off turn it on and vice-versa:
if (ledState == LOW) {
ledState = HIGH;
} else {
ledState = LOW;
}
// set the LED with the ledState of the variable:
digitalWrite(ledPin, ledState);
}
}