capra_telaire_ros

capra_co2_ros is a node to interact with a KS0457 keyestudio CCS811 Carbon Dioxide Air Quality sensor using I2C.

Documentation

Documentation can be found on the wiki page of the sensor. The code of the library was reproduced for a Jetson as we do not use an Arduino.

Pin connections

The CCS811 sensor has six pins. According to the wiki page, we only need to connect five pins: the ground (GND), the VCC, the data (SDA), the clock (SCL) and the WAKE pin. The WAKE needs to be connected to ground and the sensor feeds off 5V.

Testing on the Jetson AGX Xavier

After plugging the sensor to the Jetson, connect to the Jetson by ssh: ssh markhor­@IPADDR Replace IPADDR by the IP address of the Jetson. It is connected to the Capra network, so a simple netdiscover of the network should give you the IP address.

Launch the code with roslaunch capra_telaire_ros telaire.launch log_on:="false"

You can show the details of the buffer_read value by changing the value of the argument log_on to true: log_on:="true"

Make sure that the permissions of the pin you are connected to are right. You can check the address of the pin by executing the following command: sudo i2cdetect -y -r 8

Seeing 5A after execution of the command indicates the wiring is ok.