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EC, pH and temperature shield for arduino.

Schematic & Simulations

pH Sensor

The pH sensor is inspired from phDuino. It is composed by an amplifier and a 2nd order low-pass filter (Rauch) The amplifier is designed to span the input range of a typical pH probe (-400 -> 400 mV) to the input range of an arduino ADC (0 -> 5V). pH = 0 gives 2.5V.

CircuitLab Schematic ytznut

EC Sensor

The EC sensor is composed by 3 main structures:

  • A 2nd order low pass-filter (Rauch) in order to convert the PWM input into a +-200mV sin wave.
  • A trans-impedance amplifier
  • A crete detector.

CircuitLab Schematic tbs682

Temperature Sensor

The temperature sensor is just a 1-wire temperature sensor (DS18B20).

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