Build Instructions

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• 1

  Requirements

  • Ethernet Cable

  • 24V Power Supply

  • Revolution Pi Core 3

  • Ubidots account - Educational License - Business License
• 2

  Hardware setup

  To begin the setup of your RevPi Core or RevPi Core 3, reference the Quick Start Guide from Revolution Pi to get your device configured and connected. ;) 

  Once your RevPi Core is configured with the last image version (Jessie) and properly connected device's terminal, execute the below commands:

  sudo apt-get update
  

  then:

  sudo apt-get upgrade
  

  NOTE: The commands above will take several minutes to update. The whole system is updating, so please be patient.

• 3

  Firmware setup

  We decided to use Python programming language, because of its easy of use with the RevPi Core. If you wish to code an another language please reference the Revolution Pi forum for additional details in firmware support.   If this is your first time working with Python in your RevPi Core, take a peak at this video to become a bit more familiar:

  
  
  

   1. To begin writing your firmware, create a Python script in the RevPi Core terminal. We are going to use nano editor, in order to create the new script. To do this run the command  below:

  nano ubidots_revpi.py
  

  2. Please copy and paste the sample code below into the nano editor. Once pasted, assign your Ubidots Token where indicated in the script. Reference here for help locating your Ubidots token. In this sample code we have written delay for data communication with Ubidots to be every 1 second. If you wish extend this delay, you can do so simply do so by adjusting the "Delay = 1" line. 

  NOTE: To save the script into the nano editor - press Ctrl+o, confirm the file name to write (ubidots_revpi.py) and press enter. To close the nano editor press Ctrl+x.

  ################################################################################
  # This script simulates different sensors values using the random module and make
  # a HTTP request to Ubidots Cloud (https://ubidots.com/)
  #
  # Author: M. Hernandez
  ################################################################################
  import requests
  import time
  import random
  from uuid import getnode as get_mac
  # Assign your Ubidots TOKEN
  TOKEN = "{Assign_your_Ubidots_token}"
  # Set the delay desired to post the data DELAY = 1
  ''' This method build the JSON to be sent to the Ubidots Cloud
  '''
  def build_json(variable_1, value_1, variable_2, value_2, variable_3, value_3):
      try:
          data = {variable_1: value_1, variable_2: value_2, variable_3: value_3}
          return data
      except:
          return None
  '''   This method make the HTTP Request to the Ubidots Cloud
  '''
  def post_variable(device, value_1, value_2, value_3):
      try:
          url = "https://things.ubidots.com/api/v1.6/devices/" + device
          headers = {"X-Auth-Token": TOKEN, "Content-Type": "application/json"}
          data = build_json("temperature", value_1, "humidity", value_2, "pressure", value_3)
          response = requests.post(url=url, headers=headers, json=data)
          return response.json()
      except:
          pass
  if __name__ == "__main__":
      while True:
          mac = get_mac() # get the mac address of your device
          device_mac = ':'.join(("%012X" % mac)[i:i+2] for i in range(0, 12, 2))
          temp_value = random.randint(0,15)*2
          hum_value = random.randint(20,50)
          press_value = random.randint(2,50)*2
          print post_variable(device_mac, temp_value, hum_value, press_value)
          time.sleep(DELAY)

  3. Now let's test the script. Run the script previously created in the RevPi terminal: 

  python ubidots_revpi.py
  

  Once the script begins to run, you will see the successful status code response from the Ubidots Server.

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