Note & Experiment

What is a datalogger?

A datalogger is an electronic instrument that records measurements of temperature, relative humidity, light intensity, voltage, pressure, on/off and open/closed state changes etc. over time. Typically, dataloggers are small, battery-powered devices that are equipped with a microprocessor, memory for data storage and sensors. Most dataloggers interface with a personal computer and utilise software to activate the logger and view/analyse the collected data.

Data-logging implies data collection with storage for later data processing. A data-logging system has three main components: an interface to link to a computer, sensors and software. While planning to purchase a data-logging system, the following points need to be considered as well: purchasing strategy, organising resources, features and prices.

How does a datalogger work?

The datalogger is first connected to a personal computer. Specific software is then used to select logging parameters (sampling intervals, start time, etc.) and initiate the logger. The logger records each measurement and stores it in memory along with the time and date. The logger is then reconnected to the personal computer and the software is used again to readout the data and view the measurements as a graph or table showing the profile over time. The data collected can be exported to a spreadsheet for further manipulation.