PiAPI NPM

Bolillo Kremer

Overview

This user friendly library allows you to easily interface with multiple raspberry pi's at once using PiAPI. The simplicity of this library makes it easy for anybody to use. Most functionality is based off of onoff, which is running on PiAPI.

For updates on this project and other other entertainging coding projects, please subscribe to my YouTube channel, Bolillo Kremer.

How to use

Requirements

This library requires that PiAPI is running on your raspberry pi. You can install it on your pi with just one command! To see instructions, click here.

Initializing

You can download the PiAPI's NPM package with the following command...

npm install piapi --save

Next you need to set up a connection to PiAPI like this...

const {Pi} = require("piapi");

//Initialize Pi object with IP address and port of pi
var myPi = new Pi("192.168.1.100", Pi.defaultPort());

//You need to specify which pins will be set as input or output
myPi.initPin(2, "in");
myPi.initPin(3, "out");

//Unexports all pins on the Pi
myPi.cleanExit();

If you would rather provide a specific url than using an IP address and a port, you can do so like this.

var myPi = new Pi("http://192.168.1.100:5000");

Interfacing

You can get the state (0 or 1) of a given pin using this function

//Returns the state of pin 2 as a string
myPi.getState(2);

You can also get a JSON object of all the pin states using this function.

//Returns a Newtonsoft.Json.Linq.JObject
myPi.getStates();

If you want to set the state (0 or 1) of a pin, use this function

//Sets pin 2 to state 0
myPi.setState(2, 0);

Alternatively, you can use "toggle" to toggle the pins state

//Sets pin 2 to state 0
myPi.setState(2, "toggle");

If you wish to set the state of all initiated pins, you can do so with the setAllStates() function.

Customize PiAPI

If you add any GET or POST methods to PiAPI on your Pi, you can access them with the Get and Post functions in PiAPI.Utilities. Additionaliy, you can access the raw url of PiAPI by calling Utilities.RawUrl.

Example

const {Pi, Utilities} = require("piapi");

//Posts "Some Content" to PiAPI
var POSTResponse = await Utilities.post(myPi.rawUrl + "/SomePost", "Some content");

//Gets Response from PiAPI
var GETResponse = await Utilities.get(myPi.rawUrl + "/SomeGet");

API Settings

This library also allwos you to interface with the PiAPI settings.

The settings will take place on server reboot.

Example

//Changes port to 6000
myPi.setAPIPort(6000);

Helpers

Memorizing all the terminology such as "in", "out", "up", "down" can be confusing for some. That's where PiAPI.Helpers come in. These are just simple constant variables that can help you use PiAPI more easily.

Example

const {Pi, Utilities, Helpers} = require("piapi");

var myPi = new Pi("192.168.1.100", Pi.defaultPort());

myPi.initPin(2, Helpers.Pin.in(), Helpers.Edge.rising());
myPi.getState(2);

myPi.cleanExit();

Other Functions

In Utilities there is a function called wait that can be used to wait a given amount of miliseconds before moving on to the next line of execution. It can be implemented like this...

const {Pi, Utilities, Helpers} = require("piapi");

var myPi = new Pi("192.168.1.100", Pi.defaultPort());

myPi.initPin(2, "out");
myPi.setState(2, 1);

//Waits 1 second before moving on
await wait(1000)

myPi.setState(2, 0);

myPi.cleanExit();

For updates on this project and other other entertainging coding projects, please subscribe to my YouTube channel, Bolillo Kremer.