IoT Controlled LED using Thingsboard and Raspberry Pi

IoT Controlled LED using Thingsboard and Raspberry Pi

IoT Platforms are filling gaps between sensors and data networks. There are number of IoT platforms are available like IFTTT, ThingSpeak, Particle, Firebase and ThingsBoard for providing option to install IoT application. Here, we are using ThingsBoard to control an LED using Raspberry Pi.

ThingsBoard is an open-source IoT platform that enables rapid development, management and scaling of IoT projects. It is an open-source server-side platform that allows you to monitor and control IoT devices. Thingsboard is free for both personal and commercial usage, and you can deploy it anywhere. In our previous projects, we controlled Raspberry Pi GPIO with various IoT platforms.

 

Now, for controlling the LED using ThingsBoard we will be using paho-mqtt library to establish a connection between Thingsboard platform and Raspberry Pi.

 

Check our previous tutorial for controlling LED using different IoT platforms and Raspberry Pi:

 

Components Required

  • Raspberry Pi
  • LED
  • Breadboard
  • 250-ohm Resistor
  • Jumper wires

 

Circuit Diagram

Thingsboard based Raspberry Pi Controlled LED Circuit Diagram

 

Thingsboard Account Setup

Similar to other IoT platform, we have to create an account to use the features of ThingsBoard. Navigate to https://demo.thingsboard.io/signup to sign up on ThingsBoard.

ThingsBoard Account Setup for Controlling LED using Thingsboard and Raspberry Pi

 

After signing up, click on devices in the left corner of home screen and select Raspberry Pi Demo Device.

Select Device from ThingsBoard for Controlling LED using Thingsboard and Raspberry Pi

 

After that click on ‘Copy Access Token’ to copy the Token as it will be used in the python code.

Copy Access token from ThingsBoard for Controlling LED using Thingsboard and Raspberry Pi

 

After device setup, now create a dashboard on ThingsBoard for Raspberry Pi GPIO. For that click on ‘Dashboard’ and download the demo dashboard given for Rapsberry Pi by clicking on ‘Raspberry Pi GPIO Demo Dashboard’ as shown below:

Download Demo Dashboard from ThingsBoard for Pi

 

Now, raspberry pi dashboard for ThingsBoard is ready to use.

Raspberry Pi Demo Dashboard from ThingsBoard

 

Programming Code Explanation of Raspberry Pi for ThingsBoard

First, install the MQTT library for the raspberry pi, by using the below command:

sudo pip install paho-mqtt

 

Then mention the libraries that need to be included at the beginning of the python code:

import paho.mqtt.client as mqtt
import RPi.GPIO as GPIO
import json

 

Next command will use for details about of ThingsBoard. Enter the access token that you copied from Thingsboard.

THINGSBOARD_HOST = 'demo.thingsboard.io'
ACCESS_TOKEN = 'Your Access Token'

 

Below commands are used to send a message to the client when gets connected.

def on_connect(client, userdata, rc, *extra_params):
    print('Connected with result code ' + str(rc))
    # Subscribing to receive RPC requests
    client.subscribe('v1/devices/me/rpc/request/+')
    # Sending current GPIO status
    client.publish('v1/devices/me/attributes', get_gpio_status(), 1)

 

These commands will be used to print the response and receive the GPIO status from the server.

def on_message(client, userdata, msg):
    print 'Topic: ' + msg.topic + '\nMessage: ' + str(msg.payload)
    # Decode JSON request
    data = json.loads(msg.payload)
    # Check request method
    if data['method'] == 'getGpioStatus':
        # Reply with GPIO status
        client.publish(msg.topic.replace('request', 'response'), get_gpio_status(), 1)
    elif data['method'] == 'setGpioStatus':
………………………….
………………………….

 

Now to connect with Thingsboard at 1883 port below code is used,

client.connect(THINGSBOARD_HOST, 1883, 60)

try:
    client.loop_forever()
except KeyboardInterrupt:
    GPIO.cleanup()

 

Testing LED Control from ThingsBoard using Pi

Make a new file using the below command then paste the code given at the end for controlling LED using ThingsBoard and Raspberry Pi.

Sudo Python gpio.py

 

Now, paste the code into the above created file and run this file using the below command:

Python gpio.py

 

Now run the python code using the following command:

Python gpio.py

 

After this navigate to the Thingsboard dashboard and click on GPIO 17 to on/off LED. Response from the server will be printed on Raspberry Pi terminal.

Testing LED Control from ThingsBoard using Pi

 

Hence we have successfully controlled the Led using Thingsboard dashboard and Raspberry Pi.

Code

import paho.mqtt.client as mqtt
import RPi.GPIO as GPIO
import json

THINGSBOARD_HOST = 'demo.thingsboard.io'
ACCESS_TOKEN = 'Your Access Token'

# Set the GPIO as LOW
gpio_state = {11: False}


# The callback for when the client receives a CONNACK response from the server.
def on_connect(client, userdata, rc, *extra_params):
    print('Connected with result code ' + str(rc))
    # Subscribing to receive RPC requests
    client.subscribe('v1/devices/me/rpc/request/+')
    # Sending current GPIO status
    client.publish('v1/devices/me/attributes', get_gpio_status(), 1)


# The callback for when a PUBLISH message is received from the server.
def on_message(client, userdata, msg):
    print 'Topic: ' + msg.topic + '\nMessage: ' + str(msg.payload)
    # Decode JSON request
    data = json.loads(msg.payload)
    # Check request method
    if data['method'] == 'getGpioStatus':
        # Reply with GPIO status
        client.publish(msg.topic.replace('request', 'response'), get_gpio_status(), 1)
    elif data['method'] == 'setGpioStatus':
        # Update GPIO status and reply
        set_gpio_status(data['params']['pin'], data['params']['enabled'])
        client.publish(msg.topic.replace('request', 'response'), get_gpio_status(), 1)
        client.publish('v1/devices/me/attributes', get_gpio_status(), 1)


def get_gpio_status():
    # Encode GPIOs state to json
    return json.dumps(gpio_state)


def set_gpio_status(pin, status):
    # Output GPIOs state
    GPIO.output(pin, GPIO.HIGH if status else GPIO.LOW)
    # Update GPIOs state
    gpio_state[pin] = status


# Using board GPIO layout
GPIO.setmode(GPIO.BOARD)
for pin in gpio_state:
    # Set output mode for all GPIO pins
    GPIO.setup(pin, GPIO.OUT)

client = mqtt.Client()
# Register connect callback
client.on_connect = on_connect
# Registed publish message callback
client.on_message = on_message
# Set access token
client.username_pw_set(ACCESS_TOKEN)
# Connect to ThingsBoard using default MQTT port and 60 seconds keepalive interval
client.connect(THINGSBOARD_HOST, 1883, 60)

try:
    client.loop_forever()
except KeyboardInterrupt:
    GPIO.cleanup()

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