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phduino solderpad

An open software open hardware pH meter using an Arduino/Freeduino board

code.google.com/p/phduino/

Recent activity:

  • 9600 schematic processed7 years ago
  • 9600 board processed7 years ago
  • 9600 board received7 years ago
  • 9600 schematic received7 years ago
  • 9600 bom received7 years ago
  • 9600 pushed to7 years ago

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Description

This project describes an open software open hardware pH meter using an Arduino/Freeduino board. In other words, this is an electronic circuit to be connected with a glass electrode pH sensor.

The pHduino can operate using a LCD to display the pH and the temperature data like a pH meter. Also, you can control it using a computer by USB port.

The signal gain (slope) and the signal offset are adjusted manually by trimpots. The signal is compensated by a temperature sensor.

It seems inferior and a little bit more expensive compared with a pH meter bench instrument. However, it is interfaceable, programmable, expansible, and, the more important, open and free!

Again, it is not intent to be a high resolution analytical instrument to compete with a commercial pH meter. It is to be simple, easy to understand, easy to modify, and different!

Schematic

Board

Bill of Materials

Designator Value Description
C1 100n CAPACITOR, European symbol
C2 100n CAPACITOR, European symbol
C3 100n CAPACITOR, European symbol
C4 100n CAPACITOR, European symbol
C5 100n CAPACITOR, European symbol
C6 100n CAPACITOR, European symbol
C7 100n CAPACITOR, European symbol
C8 100n CAPACITOR, European symbol
C9 100n CAPACITOR, European symbol
C10 100uFx25V POLARIZED CAPACITOR, European symbol
C11 100uFx25V POLARIZED CAPACITOR, European symbol
C12 100n CAPACITOR, European symbol
C13 100n CAPACITOR, European symbol
CC CREATIVE_COMMONS
D1 BZX55C5V1 Z DIODE
IC1 TL072P OP AMP
IC2 TC1121CPA Microchip - 100mA charge pump voltage converter with shutdown.
JP1 PIN HEADER
JP2 PIN HEADER
JP3 PIN HEADER
JP4 PIN HEADER
JP5 PIN HEADER
JP6 PIN HEADER
JP7 PIN HEADER
JP8 PIN HEADER
LED1 LED
LED2 LED
LED3 LED
MCU1 ARDUINO-USBLONG_PADS_NO_TEXT The Ardiuno Duemilanove Pinouts layoutet as a Bare Shield. v0.5
R1 100k RESISTOR, European symbol
R2 1M Trimm resistor
R3 10k Trimm resistor
R4 10k RESISTOR, European symbol
R5 10k RESISTOR, European symbol
R6 10k RESISTOR, European symbol
R7 10k RESISTOR, European symbol
R8 10k RESISTOR, European symbol
R9 40k2 RESISTOR, European symbol
R10 10k RESISTOR, European symbol
R11 1k RESISTOR, European symbol
R12 1k RESISTOR, European symbol
R13 1k RESISTOR, European symbol
R14 1k RESISTOR, European symbol
R15 1k RESISTOR, European symbol
R16 10k Trimm resistor
S1 Momentary Switch
S2 Momentary Switch
SG1 F/TMB BUZZER Source: Buerklin
X1 BNCPTH BNC Connector, Mouser Part# 5227161

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This project is © Carlos A. Neves, and is published under the terms of the Creative Commons Attribution 3.0 Unported licence.