Part list

[Bi Hui]

Hi, regarding the part list of the PHduino, may I know the part name and component code for LM35, JP7, R2, R3 and R16? Thanks.

BH

[Carlos Neves]

LM35
LM35DZ (Plastic package TO-92).
https://www.national.com/ds/LM/LM35.pdf

JP7
This is a +5V/GND/-5V symmetric output power. It is just in case if you need, for example, power an operational amplifier (take care with the power consume). If you decide mount it, use a 3 pins pinhead 0.1 inch space.

R2, R3, and R16
These are trimming pot (potentiometers) 3/4" (19mm) rectangle sealed. It is a high precision variable resistor multi-turn (about 22 turns). You can find with different names: trimpot, trimpot multiturn, or trimmer. The name depends of the seller and of the country. Bourns is a manufacture (3006 serie).

http://www.bourns.com/ProductLine.aspx?name=trimming_potentiometers_multiturn
http://www.bourns.com/data/global/pdfs/3006.pdf

R2: trimming pot 1M ohm, 3/4" rectangle.
R3: trimming pot 10k ohm, 3/4" rectangle.
R16: trimming pot 10k ohm, 3/4" rectangle.

You can buy them from different sellers.

Carlos A. Neves

2012/7/28 Bi Hui <love...@live.com.sg>

Hi, regarding the part list of the PHduino, may I know the part name and component code for LM35, JP7, R2, R3 and R16? Thanks.

BH

--
You received this message because you are subscribed to the Google
Groups "pHduino" group.
To post to this group, send email to phd...@googlegroups.com
To unsubscribe from this group, send email to
phduino+u...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/phduino?hl=en

[Bi Hui]

oh i see..another question to verify though, is it possible if i can monitor the pH data through serial monitor instead of the external LCD that you're using?

BH

[Carlos Neves]

Yes. You do not need the trimpot to control the intensity of the LCD neither connect the LCD. The strings are sent by serial port.

Take a look at the code.

Carlos A. Neves

2012/9/28 Bi Hui <love...@live.com.sg>

--

[Carlos Miguens]

Hola Carlos, te queria consultar si has podido realizar mediciones de pH desde arduino y que hardware deberia tener para realizar dichas mediciones.

Gracias,
Carlos.

[Carlos Neves]

Hola,

Yes. You can measure the pH from 4 up to 9.

You need a Arduino with a Atmega 328 or better. The code does not fit in a Atmega168.

Carlos A. Neves

2012/9/28 Carlos Miguens <cmig...@gmail.com>

[Carlos Miguens]

Hola,

  Cuento con un Arduino Mega 2560 ¿lei que tambien hace falta un diodo para realizar? sabes si es uno en particular y/o donde puedo conseguirlo.

Gracias,
Carlos.

[Carlos Neves]

I don't have a Mega 2560. Someone in the group discussion could answer this question.

If you are talking about the zenner, yes. It is important to avoid to apply a negative voltage in the analog-digital converter.

[Carlos Miguens]

Yes I talking about the diode zenner,, I would like to know if I could use any zenner to the measure pH with pHduino and what's the way to wire with arduino.

[Carlos Neves]

You can use any low power general purpose zenner of 5.1V. The maximum current by this diode is something about 5mA. This means that the power is about 25mW. The BZX55 family is 500mW. 5V1 is the same of 5.1V.

You can use

[Carlos Miguens]

Thanks Carlos, voy a buscar información y leer al respecto.

Gracias,
Carlos.

[Mike Rightmire]

Mike
Michael Rightmire
408-890-2121 (Skype)
+49-176-7131-8758
Right...@UTR.Net

>>>>>>>>> R2<http://code.google.com/p/phduino/source/detail?r=2>,
>>>>>>>>> R3 <http://code.google.com/p/phduino/source/detail?r=3> and
>>>>>>>>> R16<http://code.google.com/p/phduino/source/detail?r=16>?

Mike
Michael Rightmire
408-890-2121 (Skype)
+49-176-7131-8758
Right...@UTR.Net