adafruitIO_pots.py

## Publish analogue values to Adafruit IO
## Adapted from https://github.com/adafruit/Adafruit_Python_MCP3008/blob/master/examples/simpletest.py

################################################################################    
#    Copyright © 2017 Callum Kirkwood                                          #
#                                                                              #
#    This program is free software: you can redistribute it and/or modify      #
#    it under the terms of the GNU General Public License as published by      #
#    the Free Software Foundation, either version 3 of the License, or         #
#    (at your option) any later version.                                       #
#                                                                              #
#    This program is distributed in the hope that it will be useful,           #
#    but WITHOUT ANY WARRANTY; without even the implied warranty of            #
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             #
#    GNU General Public License for more details.                              #
#                                                                              #
#    You should have received a copy of the GNU General Public License         #
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.     #
################################################################################

# Import Adafruit IO REST client.
from Adafruit_IO import Client
import Adafruit_MCP3008
from time import sleep

# Set to your Adafruit IO key.
ADAFRUIT_IO_KEY = 'API_KEY'

# Create an instance of the REST client.
aio = Client(ADAFRUIT_IO_KEY)

## Software SPI setup for MCP3008
CLK = 11
MISO = 9
MOSI = 10
CS = 8
mcp = Adafruit_MCP3008.MCP3008(clk=CLK, cs=CS, miso=MISO, mosi=MOSI)

## Adjust the output range if necessary and send the values to an Adafruit IO Feed
## NewValue = (((OldValue - OldMin) * (NewMax - NewMin) / (OldMax - OldMin)) + $
while True:
        pot1 = (((mcp.read_adc(0) - 0) * (255 - 0)) / (1023 - 0)) + 0
        pot2 = (((mcp.read_adc(2) - 0) * (255 - 0)) / (1023 - 0)) + 0
        pot3 = (((mcp.read_adc(1) - 0) * (255 - 0)) / (1023 - 0)) + 0
	aio.send('pot-1', pot1)
	aio.send('pot-2', pot2)
	aio.send('pot-3', pot3)
	sleep(0.5)