Display any number from 0 to 99999. For example 390 is blinked as
- 3 brief flashes,
- 9 brief flashes,
- 0 (one long flash).
After each digit there is a brief pause before the next digit is flashed.
When all digits in your number have been flashed, there is a longer pause, and then it all repeats - if you want it to.
- Use as a heartbeat LED to indicate the status of the program.
- Indicate an analog reading
- Indicate a digital counter
- When connected to wifi, blink out the last 3 digits of the IP address, so you know where to find your device on the network.
Example :
flasher1.blink ( D4, LOW, 1883 )
- D4 is the pin number of the LED ( you can use LED_BUILTIN )
- LOW (or HIGH) is set to define the level required to turn on the LED
- 1883 is the number you want to blink ( in the range of 0-99999 )
BlinkDigits returns 'true' when all the digits have been flashed. See examples for why this is useful.
Here is a simple example which uses one line of code in loop( ) to blink out 23.
#include "BlinkDigits.h"
BlinkDigits flasher1;
int ledPin = D4;
void setup() {
pinMode(ledPin, OUTPUT);`
}
void loop() {
flasher1.blink(ledPin, LOW, 23);
}
If you want to blink out leading zeros, for example 023, simply state the number of places you want - using the optional 'width' parameter - in this case 3.
flasher1.blink(ledPin, LOW, myNumber,3);
Blinking too fast for you to read?
Here we slow things right down.
flasher1.config(400,1500,800, 5000); // slower timings.
- 400 : the on/off digit 'flash' time,
- 1500 : the zero digit's 'on' time
- 800 : the delay between digits
- 5000 : the delay before repeating the number.
- Defaults are 200, 1000, 500, 3000.
-
Eratic timing of blinks : ensure you haven't used blocking code elsewhere in your project. BlinkDigits relies on fast non-blocking code in loop( ).
-
LED not blinking : Ensure you have the correct pin for the LED, and it is defined as output.
-
Not blinking : Ensure the number is between 0 and 99999, and not negative.
-
Wrong number of blinks : do not add your own leading zero in code, as this denotes octal numbers i.e. do not use 023 (it will blink out 19), simply use 23 instead.
-
Not all digits blinked If you included the 'width' parameter, make sure it is set correctly.