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Author Topic: Temp, Humidity CO2 sensor and library.  (Read 23765 times)
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Hi DirtGambit ,
I have some difficulties to work with Cozir unit, to change mode and try in Mode2.
I try to send this lines : mySerial.print("K 2\r\n");
and then verify cozir received the message, expecting Response: "K #\r\n" like explain in " cozir software user's guide"
to test the response, I proceed like following:

//essai pour verifie rchangement de mode
while(buffer[ind-1] != 0x0A)
{
if(mySerial.available())
{
buffer[ind] = mySerial.read();
ind++;
}

for(int i=0; i < ind+1; i++)
{
Serial.write(buffer);//test
Serial.print("\t");
}
but the response is
? ? ?
So, should it be possible to have your library to understand how it works?
Best regards
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Hi DirtGambit,

I have copied your library and your code, and my Arduino uno is happy with the code. I have attached the sensor to my arduino how you did. But when i look at the readings, they are just repeated every 0.5 Seconds and the co2, humidity and temperature reading first 3 digits are always the same.

Can you please suggest what i could be doing wrong

thank you very much!!
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a link from the manufacturer - schematic + simple code
see - http://www.co2meters.com/Documentation/AppNotes/AN128-%20Cozir_Arduino.pdf -
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I don't get it to work, I hope someone can point out what's going wrong.

The sample sketch provided by Cozir, as posted earlier here, gives me weird values:
Code:
Co2 = ovf ppm
Co2 = ovf ppm
Co2 = ovf ppm
Co2 = ovf ppm
Co2 = -1152925184.00 ppm
Co2 = -1152925184.00 ppm
Co2 = ovf ppm
Co2 = ovf ppm
Co2 = ovf ppm
Co2 = ovf ppm
Co2 = ovf ppm
Co2 = ovf ppm
Co2 = ovf ppm
Co2 = ovf ppm
Co2 = ovf ppm
Co2 = ovf ppm
Co2 = -4208868864.00 ppm
Co2 = -4208868864.00 ppm
Co2 = ovf ppm

At first I didn't even get these values, but in the code Rx and Tx seem to be exchanged. Just switch the wires if you get no results at all.

I also tried the sketch in the first post of this topic the library 1.03 by Rob Tillaart & Michael Hawthorne, nothing happens. When I use the same sketch with the old library that's attached with the first post, I get this on my monitor:
Code:
Celcius : 0.00
Fahrenheit : 32.00
Humidity : 0.00
CO2 : 0
Digital Filter : 0

Sometimes after a reset, the values are a bit different, I think due to calibration or lack thereof:
Code:
Celcius : 0.20
Fahrenheit : 32.36
Humidity : 0.20
CO2 : 2
Digital Filter : 2

I uncommented the line below, because I read the sketch is supposed to work with polling and the default mode is streaming. The line implicates it's used to enable polling:
Code:
czr.SetOperatingMode(CZR_POLLING);

However, with the other line activated, to set streaming, I get similar readings:
Code:
Celcius : 0.10
Fahrenheit : 32.18
Humidity : 0.10
CO2 : 1
Digital Filter : 1

« Last Edit: January 29, 2014, 04:03:58 pm by Toledor » Logged

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As I still have no such sensor (my wishlist is too long)  I cannot replicate your problem, sorry
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Hey there!  I need assistance on my project using the COZIR sensor.

The first thing I did was hook up the sensor to my arduino and tested the sample code found on the COZIR website but I am getting the same results as Toledor. I would like the sensor to output co2, temp, and humidity readings.

Question for Dirt Gambit and Jon:

How do I use your C library in my arduino sketch? Is there a certain directory I need to save the library in? When I try to run the sketch that you had posted at first, I get several errors:

test1.ino:2:20: error: cozir.h: No such file or directory
test1:5: error: 'COZIR' does not name a type
test1.ino: In function 'void setup()':
test1:7: error: redefinition of 'void setup()'
Sen_design:32: error: 'void setup()' previously defined here
test1.ino: In function 'void loop()':
test1:15: error: redefinition of 'void loop()'
Sen_design:42: error: 'void loop()' previously defined here
test1:17: error: 'czr' was not declared in this scope

Help would be so much appreciated  smiley
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about installation of libraries - http://arduino.cc/en/Guide/Libraries -

should be enough to get things compiling.
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Thanks for the quick response Rob!
I got the code to work in conjunction with the library however I seem to have the same issue that Toledor is having. My readings are :

Celcius : 0.20
Fahrenheit : 32.36
Humidity : 0.20
CO2 : 2
Digital Filter : 2

There is no change to these results, any idea what the cause might be?

Also the polling mode doesn't seem to be working properly . I un-commented the line which allowed the CZR_POLLING mode, however the code still spits out readings infinitely. 
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Please disregard my last post I just needed to switch my Rx and Tx  to pins 3 and 2 on my arduino board to match with the code  smiley-roll-sweat

However I would still like  to operate in polling mode. I am getting a constant flush of data from the sensor even though I am attempting to operate in polling mode. Here is my sketch:

Code:
#include <SoftwareSerial.h>
#include "cozir.h"

SoftwareSerial nss(3,2);
COZIR czr(nss);

void setup()
{
  Serial.begin(9600);
  delay(3000);
  czr.SetOperatingMode(CZR_POLLING);
  //czr.SetOperatingMode(CZR_STREAMING);
}

void loop()
{
  float t = czr.Celsius();
  float f = czr.Fahrenheit();
  float h = czr.Humidity();
  int c = czr.CO2();
  int digi = czr.GetDigiFilter();
 
  Serial.print("Celcius : ");Serial.println(t);
  Serial.print("Fahrenheit : ");Serial.println(f);
  Serial.print("Humidity : ");Serial.println(h);
  Serial.print("CO2 : ");Serial.println(c);
  Serial.print("Digital Filter : ");Serial.println(digi);   
}

Notice I un-commented the line where CZR_POLLING is. I may be going about the whole process wrong though...
Any ideas?
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apparently your code always return 2. (Fahrenheit is a 0.2Celsius  converted)

I peeked into the library and saw that there are open ends e.g. in the request function (which is at the core)

I have attached a datasheet with another Arduino program, you might give that a try.

* AN128- Cozir_Arduino.pdf (106.06 KB - downloaded 7 times.)
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