#!/usr/bin/env python

# read_ec_ph.py
# 2018-08-29
# 
# Uses spiroboard.py to read EC and pH from the SpiroBoard

import pigpio
import time
import spiroboard as sb

if __name__ == "__main__":

  # Open the pigpio I/O library
  pi = pigpio.pi()

  if not pi.connected:
    exit(0)

  # Open bit banging I2C on standard I2C pins
  error = pi.bb_i2c_open(2, 3, 100000)

  if error:
    exit(error)

  # Set the static state of the square wave and gain measurement
  pi.write(sb.SQW,0)      # Square Wave off
  pi.write(sb.ENINL,1)    # Active Low input sample disable
  pi.write(sb.ENOUTH,0)   # Active High output sample disable
  pi.write(sb.ECSEL,0)    # Select the calibration resistor
  pi.write(sb.TEMPSEL,0)  # Select the EC Thermistor
  
  # Enable the output registers to drive the GPIO pins
  pi.set_mode(sb.SQW, pigpio.OUTPUT)
  pi.set_mode(sb.ENINL, pigpio.OUTPUT)
  pi.set_mode(sb.ENOUTH, pigpio.OUTPUT)
  pi.set_mode(sb.ECSEL, pigpio.OUTPUT)
  pi.set_mode(sb.TEMPSEL, pigpio.OUTPUT)

  # Read the EC and pH
  (ppm, ph) = sb.read_ec_ph(pi)
  print ppm, ph

  # Reset initial state for controls
  pi.write(sb.SQW,0)  # Square Wave state
  pi.write(sb.ENINL,1)  # Active Low input sample disable
  pi.write(sb.ENOUTH,0)  # Active High output sample disable
  pi.write(sb.ECSEL,0)  # Select the calibration resistor
  pi.write(sb.TEMPSEL,0)  # Select the EC Thermistor

  pi.bb_i2c_close(2)

  pi.stop()