OSSDAS stands for Open Source Solar Data Acquisition System.
- Logs everything into attached SD card for data analysis in PC. A typical 1GB SD card can store years of data. Data is recorded in frequency of few seconds. Enough to plot a graph to analyze performance of short periods of ten minutes too.
- Keep track of the solar panel voltage, battery voltage, charge current and other parameters
- Keeps track of other data such as temperature, etc
- Can work without the LCD and still record information to the SD card and vice versa.
Version 1 beta:
Component layout of V1 beta
- Current sense through even lower valued resistor and using op-amp to multiply the very low drop voltage. Symmetrical to a low side CSA.
- Integrated charging control. Charging path from solar panel to battery goes through CSA, FUSE, DIODE, INDUCTOR, and a MOSFET. The MOSFET is driven by the micro controller.
- Introduced one/two SMD components; capacitors and resistors.
Software/Firmware: A derivative work from the Atmega32 Datalogger by C.C.Dharmani.
Status: Not put into production. Many changes are made which includes changing most passives to surface mount devices.
- Most resistors and capacitors are replaced with 0603 SMD version.
Software/Firmware: Work in progress. This will be also a derivative work from the Atmega32 Datalogger by C.C.Dharmani.
Status: Final development stage.
UPDATE#1’st Aug 2012: Software done. Little bug in amperes reading, everything else goes fine. Hope to finish it soon after my exams.