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
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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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