News — K30

USC Human Powered Vehicle Design Team

The University of Southern California Human Powered Vehicle Design Team used our K-30 sensor in an attempt to develop an automated cabin fresh air delivery system for their vehicle. This project was part of their overall strategy to design an entry for the 2014-2015 Human Powered Vehicle Design Challenge sponsored by the American Society of Mechanical Engineers. CO2Meter.com was a sponsor for the USC team. The goal of the project was to improve rider performance by keeping the CO2 ppm in the cabin below a determined threshold and regulating cabin temperature while maintaining vehicle aerodynamics. The team knew at CO2...

Read more →


K30 CO2 Sensor Lockup Solutions When Using Arduino

Customers using the Senseair K30 1% and 3% CO2 sensors with the Arduino MCU and the supported library occasionally see “lockup” of the sensor. It appears that the sensor sends negative data and quits working. After unplugging the sensor from power momentarily, it works again.This seems to be a random problem. Fortunately, we have been able to recreate the problem, and have several solutions here: ANN144 - K30 Sensor Lockup Solutions When Using Arduino.

Read more →


CO2 BagSystem Delivers Large Scale Seedling Growth at Reduced Cost

by Drees R. Oellerich, ChopperLight.com, Berlin, Germany The common way to deliver increased CO2 to plants is to elevate the CO2 content of the entire grow room atmosphere. This procedure depends on air tides or fans in a closed and sealed room structure to deliver the CO2 evenly across each plant. While easy in small rooms, in industrial-scale grow rooms this becomes problematic. By calculating the required volume of CO2, it is obvious that most of the CO2 enriched air is wasted on the room space itself and is not used in the narrow surrounding area of the plants. Different...

Read more →


SenseAir K Series Sensor UART EEPROM/RAM Access Procedure

This application note describes how to directly read and write data directly to the SenseAir K30 and K33 line of CO2 sensors. Download the application note here (pdf). Please read the MODBUS specification document before reading this document to gain a background understanding on the sensor’s implementation of MODBUS and for checksum calculating algorithms. Using these commands opens up the entire EEPROM and RAM of the sensor for UART access. It will also allow us to access the sensor using the memory locations described in the I2C guide.

Read more →


Interfacing a K30 Sensor with Arduino Development Kit via I2C

The Arduino makes an ideal platform for prototyping and data collection with the SenseAir K series of CO2 sensors. Arduino CO2 Sensor Application Note From Wikipedia: Arduino is a single-board micro controller to make using electronics in multidisciplinary projects more accessible. The hardware consists of an open-source hardware board designed around an 8-bit Atmel AVR microcontroller, or a 32-bit Atmel ARM. The software consists of a standard programming language compiler and a boot loader that executes on the micro controller. Arduino boards can be purchased pre-assembled or as do-it-yourself kits. Hardware design information is available for those who would like...

Read more →