echo '' ;

ESP8266 Mongoose-OS Interface – LED

To turn on the led you need to load the gpio_api.js file.


LED Turn ON/OFF

Note : This below example was tested mongoose os with java script app demo-js in ESP8266 NodeMCU Dev Board(ESP-12E)

  • This below example turn on the LED GPIO-4 (NodeMCU Dev Board digital pin 2)
  • Set the GPIO pin mode as OUPUT uisng gpio set mode function ex: GPIO.set_mode(led, GPIO.MODE_OUTPUT)
  • Turn off the LED call the gpio write function with low-0 ex : GPIO.write(led, 0) .
  • Turn on the LED call the gpio write function with low-1 ex : GPIO.write(led, 1) .

Code

load('api_gpio.js');
 
// Configure LED
let led = 4; //lde pin GPIO04
GPIO.set_mode(led, GPIO.MODE_OUTPUT);
GPIO.write(led,1);

 


LED turn ON/OFF using button

  • Use Boot button(GPIO-0)
  • The example code used blink in-build LED, It’s connected to GPIO-10.
  • You can change any other pin Ex : led = 4; // Get LED GPIO-04 pin; 
  • Note : Code 1 and Two are same application and functionality. Main difference is calling function.

Code 1 :

  • Used GPIO-0 pin (Boot button in NodeMCU Dev Board), as interrupt and used Button interrupt handler function.
// http://www.ArunEworld.com/Embedded/ESPressif/ESP8266/ESP8266_Mongoose-os/
// Tested By  : Arun(20170430)
// Example Name : AEW_LED-Blink_Using_Button.js
// Firmware  : Mongoose OS for ESP32
//*******************************//
// This example demonstrates how to react on a button press by toggling LED.
//
// To try this example,
//   1. Download <code>{{EJS6}}</code> tool from https://mongoose-os.com/software.html
//   2. Run <code>{{EJS7}}</code> tool and install Mongoose OS
//   3. In the UI, navigate to the <code>{{EJS8}}</code> tab and load this example

// Load Mongoose OS API
load('api_gpio.js');

// Configure LED
let led = ffi('int get_led_gpio_pin()')();  // Get built-in LED GPIO pin
GPIO.set_mode(led, GPIO.MODE_OUTPUT);

let pin = 0;   // GPIO 0 is typically a 'Flash' button
GPIO.set_button_handler(pin, GPIO.PULL_UP, GPIO.INT_EDGE_NEG, 200, function(x) {
  let value = GPIO.toggle(led);
  print('Button press, pin:', x, 'LED pin:', led, ' Value: ', value);
}, true);

print('Flash button is configured on GPIO pin ', pin);
print('Press the flash button now!');

 

Code 2:

  • In this code i was used GPIO-0 pin (Boot button in NodeMCU dev Kit) as interrupt and used interrupt handler function.
  • If your using interruot handler function then you need o enable the interrupt using GPIO.enable_int(pin)  function
load('api_gpio.js');

GPIO.set_mode(4, 1);
//GPIO.write(10, 0);


GPIO.set_int_handler(0, GPIO.INT_EDGE_NEG, function(pin) {
   print('Pin', 0, 'got interrupt');
   GPIO.toggle(4);
   
}, null);
GPIO.enable_int(0);

 

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Discover more from ArunEworld

Subscribe now to keep reading and get access to the full archive.

Continue reading