(*) OE 1 GCA (*)
The amplifier for the barometric sensor removes the offset and spreads the
output range for 922 - 1049hPa to a signal of 0-2.5V.
This signal is measured with a serial 8-bit adc (Ti TLC549) which is
connected to the parallel port of the pc. I'm using "cron" to capture
the barometric pressure values every 15 minutes. The values are
stored in a textfile and every night "gnuplot" is used to plot the desired
graphs.
The amplifier can be modified easily to adopt to the requirements of the datalogger.
You can use this spreadsheet: MPX4100A.xls.
An example for 922hPa to 1049hPa with output 0-5V can be found here.