Example analog data grab from a solar panel with Adafruit's library on the MCP3008 with a POST request to a posttestserver endpoint

grab-solar-data-send.py

# this code is based on the Adafruit MCP3008 library being installed and the ADC being properly wired to your Raspberry Pi
# and source of analog data

# for math division
from __future__ import division

# Import SPI library (for hardware SPI) and MCP3008 library.
import Adafruit_GPIO.SPI as SPI
import Adafruit_MCP3008

# for POST request
import requests

# Software SPI configuration:
CLK  = 18
MISO = 23
MOSI = 24
CS   = 25
mcp = Adafruit_MCP3008.MCP3008(clk=CLK, cs=CS, miso=MISO, mosi=MOSI)

# Get current value from pin 0
analog_val = mcp.read_adc(0)

# multiplier
multiplier = (5 / 1024) # 5V divided by 1024 analog steps

computed_voltage = (analog_val * multiplier)

# compute current
# V = IR -> I = V/R

computed_current = (computed_voltage / 1000) # 1000 = 1K Ohm

# compute power
# P = IV

computed_power = (computed_voltage * computed_current)

print 'analog val: ' + str(analog_val) + ' voltage: ' + str(computed_voltage) + ' current: ' + str(computed_current) + ' power: ' + computed_power

# optional send to server, this is using this public service called posttestserver but v2
# you create a random string, test if it's available, if it is an endpoint will be created for you
# then you use the endpoint to send this data to
# at the time of writing this file, I got this endpoint: http://ptsv2.com/t/0436952175/post

requests.post('http://ptsv2.com/t/0436952175/post', data = {
    'analog_value': analog_val,
    'computed_voltage': computed_voltage,
    'computed_current': computed_current,
    'computed_power': computed_power
})