mini logger circuit


Posted on Feb 5, 2014

Build your own a personal data logger for recording analog signal. The MiniLOGGER provides 8-channel analog input(-99mV to +999mV), 1-channel pulse input, battery backup 256kB SRAM, Real-time Clock, and RS232C. Start/Stop recording can be made by MANUAL switch or preprogrammed Start/Stop Time. The format of uploading data is ASCII format, suitable


mini logger circuit
Click here to download the full size of the above Circuit.

for importing and graphing by Excel or any Scientific Plot Program. Exemplary circuit used for measuring Insolation and Air Temperature vs. Time is included. I have designed the MiniLOGGER to be used as a data acquisition module for my experiment, "Long-term Evaluation of Grid Connected PV System". Formerly, there`s a signal conditioner board having chopper stabilized DC amplifier for Pyranometer, HALL sensor, LM35, and kWhr sensor, it`s called Solar-Logger. The firmware of Solar-Logger was written entirely in assembly code, very difficult for maintenance and modification. So I decided to rewrite using `C` and to provide this page describing how to build the generic part, without analog signal conditioner, with new name, the MiniLOGGER. Those who interested, for her/his experiment can be made themselves, the analog conditioning board to suit their experiment easily. I shall provide the circuit of analog signal amplifier to be used with the MiniLOGGER on later. Run terminal emulation program, say HyperTerminal configured with 9600 bps 8n1, Xon/Xoff flow control, connect RS232C serial port of the MiniLOGGER to COM1. After put a DC adapter, press enter, MiniLOGGER will send title message. Try with ` ` help command. The MiniLOGGER accepts single letter command as describe in help command. Manual START/STOP recording is the easiest way of using in standalone mode, i. e. , without connecting to web server. Manual switch...




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