====== PHMET01A - Škálovatelný pHmetr s mnoha sondami  ======

{{:cs:designs:img_20160303_025351.jpg?400|}}

Jde o laboratorní přístroj původně zkonstruovaný pro chemickou sekci [[http://cesky.odz.ujf.cas.cz/|Oddělení dozimetrie záření UJF]]. 

===== Software =====

[[https://github.com/ODZ-UJF-AV-CR/pHmeter|Source code]]

===== Zapojení =====

Konstrukce využívá následující moduly: 

  * [[cs:i2cadc|]]
  * [[cs:i2cdiff|]]
  * [[cs:ozdual|]]


==== 5V ==

''+5V → ODROID C1/4''

''GND → ODROID C1/6''

==== I2C ====

Jumper SLAVE OUT.
Jumper MASTER OUT.
Hub I2C GND and VDD to ADC GND and VDD.

''ODROID C1/3 → I2CHUB02B/SDA''

''ODROID C1/5 → I2CHUB02B/SCL''

''I2CHUB02B/1/SDA → I2CADC01A/SDA''

''I2CHUB02B/1/SCL → I2CADC01A/SCL''

==== ADC ====

Power +5V to I2CADC01A and OZDUAL02B.

Jumper REF- GND.

''I2CADC01A/Vref → OZDUAL02B/-in''

''I2CADC01A/REF+ → OZDUAL02B/Vref''

''I2CADC01A/IN+ → OZDUAL02B/out''

''I2CADC01A/IN- → OZDUAL02B/-in''

''OZDUAL02B/Vref → pH probe -''

''OZDUAL02B/+in → pH probe +''

==== Operační zesilovač ====

{{:cs:designs:img_20160301_214420.jpg?400|}}

{{:cs:designs:img-925133830.pdf|schematic of ADC}}