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usb-sensors-linux - Install_AirSensor_Linux.wiki

Introduction

Instructions how to install the airsensor utility on Linux.

Tested on

Raspbian (Raspberry Pi)

Details

Requirements

The Applied Sensors Indoor Air Monitor USB sensor, also sold as Voltcraft CO-20 at Conrad.

LibUSB-dev

Install LibUSB-dev, which is needed when compiling the airsensor utility.

$ sudo apt-get install libusb-dev

Compile tempsensor from sources

Install required software

The 'build-essential' package is needed to be able to compile the source code.

$ sudo apt-get install build-essential

Download the source code and compile

Download the latest version from SVN trunk, no released version is packaged yet.

$ mkdir airsensor $ cd airsensor $ wget http://usb-sensors-linux.googlecode.com/svn/trunk/airsensor/airsensor.c

Compile the source code

$ gcc -o airsensor airsensor.c -lusb

Test

You can now execute the airsensor and see if you get readings, as seen on most Linux installations it seems that you must be root user, or then add udev rule to make the device read/write.

To run with root access

$ sudo ./airsensor -o 2013-04-28 14:55:56, VOC: 450, RESULT: OK $

Without root access it will print following

$ ./airsensor -o 2013-04-28 14:55:19, Error: claim failed with error: -1 $

Make Udev rule

Insert a udev rule to get read/write access to the device from normal user.

Create and edit following file:

$ sudo nano /etc/udev/rules.d/99-usb.rules

Add following lines;

```

iAQ

SUBSYSTEM=="usb", ATTR{idVendor}=="03eb", ATTR{idProduct}=="2013", MODE="0666" ```

Save and reboot, now the device should be writable and give you results.

Example, without sudo

$ ./airsensor -o 2013-04-28 15:08:55, VOC: 450, RESULT: OK $

Please see readme for more usage instructions

Troubleshooting

Error: claim failed with error: -1

If you get following issue when running air sensor: