[SOLVED] Get value to switch a led

Ubidots API
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1

How can i get last value from ubidots to switch a led on raspberry?

from ubidots import ApiClient
import RPi.GPIO as GPIO

api=ApiClient(token="TOKEN123")
variable=api.get_variable("5782b5977625426a9d647175")

last_value=variable.get_values(1)

GPIO.setmode(GPIO.BCM)
GPIO.setup(23, GPIO.OUT)
print last_value[0]['value']

if last_value==1.0:
GPIO.output(23,1)
2

Hey @Frank!

Ubidots has a documentation about Rpi: http://ubidots.com/docs/devices/raspberrypi.html#raspberry-pi-wifi-ethernet
When you get the data you could use this package of NPM to set a GPIO pin of rasp:
https://www.npmjs.com/package/rpi-gpio

Best regards,
Metavix

3

Thanks! But i don’t manage to understand what is wrong, i got the last value from ubidots but I can not control the LEDs

4

@Metavix Help! i got the last value from ubidots but I can not control the LEDs

5

@Frank it could be many things

  • Voltage of LED
  • You didn’t connect right the LED to VCC and GND

Do you have a multimeter?

Best regards,
Metavix

6

@Frank by the way you can read that post, maybe you are setting another GPIO.

Best reards,
Metavix

7

@Metavix I’m sure of what i done, i know the difference between BOARD and BCM. I don’t understand what is wrong in this code :

from ubidots import ApiClient
import RPi.GPIO as GPIO

api=ApiClient(token="TOKEN123")
variable=api.get_variable("5782b5977625426a9d647175")

last_value=variable.get_values(1)

GPIO.setmode(GPIO.BCM)
GPIO.setup(23, GPIO.OUT)
print last_value[0]['value']

if last_value==1.0:
GPIO.output(23,HIGH)
8

Hi, Frank!

Sorry for the late response, I was testing the code in my RPi to make sure it worked.

You have a little mistake in the conditional, it will always evaluate to False, given that last_value is a dict and you’re checking equality between a dict and a float.

Now, to fix that you just have to do:

if last_value[0].get('value') == 1.0:

And… in the last line, remember that HIGH is an attribute of the GPIO class that wraps a True value, you have that line perfect in the first post (you send a 1). It should be:

GPIO.output(23, GPIO.HIGH)

Hope this helps :smiley:

9

Thank you so much @juanda95 ! And if i would switch the led each time the value changes without start the file.py ?

10

@Frank You can implement the GET via polling every N seconds. I’m going to grab your code if you don’t mind and modify it below:

import RPi.GPIO as GPIO
from ubidots import ApiClient
from time import sleep

api = ApiClient(token="TOKEN123")
variable = api.get_variable("5782b5977625426a9d647175")

GPIO.setmode(GPIO.BCM)
GPIO.setup(23, GPIO.OUT)

while True:
    last_value = variable.get_values(1)
    if last_value[0].get("value") == 1:
        GPIO.output(23, GPIO.HIGH)
    else:
        GPIO.output(23, GPIO.LOW)
    sleep(5) # Sleep for 5 seconds

This code will keep checking the last value of your variable every 5 seconds and do the desired action (turn ON or OFF the LED)

11

@juanda95 Thank you! Fantastic!
Best regards,
Frank

12

You’re welcome :smiley: We’re here to help, hope you enjoy Ubidots.