Elektor has a long history when it comes to publishing data acquisition systems and loggers — the most recent project [1] proved very popular. The data logger we are proposing here is unique due to its simplicity and compact size; a microcontroller and a handful of common components are all it takes for hardware. This data logger is used to save the values of four analogue channels supplying any voltage ranging from 0 to 5 V onto a standard memory card (SD – Secure Digital).
Update: February 2, 2008
New firmware in zip file -11 (free downlolad).
Change log:
- Fixed spelling bug "SYTEM STOPPED" to "SYSTEM STOPPED"
- Fixed junk character displayed after the last second digit on the time text line
Correction: Febuary 9, 2009
For proper level conversion between the USB and the PIC microcontroller, the schematic and the parts list should be corrected to read:
R5,R7,R9 = 2kohm2
R6,R8,R10 = 3kohm3
These changes have been implemented in the Component List published on the project web page.