raspi-led
v2.1.2
Published
Provides access to status LED on the Raspberry Pi as part of the Raspi.js library suite
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Raspi LED
Raspi LED is part of the Raspi.js suite that provides access to the onboard status LED.
If you have a bug report, feature request, or wish to contribute code, please be sure to check out the Raspi IO Contributing Guide.
System Requirements
- Raspberry Pi Model B Rev 1 or newer (sorry Model A users)
- Raspbian Jessie or newer
- Node-RED works, but can be finicky and difficult to debug.
- See https://github.com/nebrius/raspi-io/issues/24 for more info about support for other OSes
- Node 4.0.0 or newer
Detailed instructions for getting a Raspberry Pi ready for NodeBots, including how to install Node.js, can be found in the wiki
Installation
First, be sure that you have installed raspi.
Install with npm:
npm install raspi-led
Note: this project is written in TypeScript and includes type definitions in the package.json file. This means that if you want to use it from TypeScript, you don't need to install a separate @types module.
Example Usage
In TypeScript/ES6:
import { init } from 'raspi';
import { LED, ON, OFF } from 'raspi-led';
init(() => {
const statusLed = new LED();
// Flash the LED twice a second
setInterval(() => {
if (statusLed.read() == ON) {
statusLed.write(OFF); // Turn off the status LED
} else {
statusLed.write(ON); // Turn on the status LED
}
}, 500);
});
In JavaScript:
const raspi = require('raspi');
const led = require('raspi-led');
raspi.init(() => {
const statusLed = new led.LED();
// Flash the LED twice a second
setInterval(() => {
if (statusLed.read() == led.ON) {
statusLed.write(led.OFF); // Turn off the status LED
} else {
statusLed.write(led.ON); // Turn on the status LED
}
}, 500);
});
API
Module Constants
new LED()
Instantiates a new status LED instance.
Arguments: None
Instance Methods
hasLed()
Returns whether or not a supported built-in LED was found
Arguments: None
Returns: boolean
read()
Reads the current status of the LED.
Arguments: None
Returns: ON or OFF
write(value)
Turns the LED on or off.
Arguments:
Returns: None
License
The MIT License (MIT)
Copyright (c) Bryan Hughes [email protected]
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.