Microcontroller Data Logging Techniques

Data logging is the process of collecting data,
usually over a long period of time. Data loggers are
often used in scientific experiments and in
environmental monitoring applications. Most data
logging devices are nowadays computer based and are
developed using microprocessors or microcontrollers.
Sensors play an important role in data logging
applications. Physical properties such as
temperature, light, pressure, sound, humidity, and
acidity can be sensed by sensors. The outputs of
sensors are usually converted to the correct format
and measured signals are stored by the data loggers.
Data loggers are usually equipped with large
internal non-volatile memories, or external memories
such as flash memory cards are used. The collected
data is usually read offline and analyzed on a PC
using statistical packages such as the Excel
spreadsheet. This book describes how a complete data
logger device can be designed using PIC18
microcontrollers. The designed device is equipped
with a real time clock chip, and SD card flash
memory can be connected to the device for long term
permanent storage of the collected data.