I'm interested in your products for a car engine data logger. I want to use a laptop (1x parallel, 1x serial, 1x USB), but could go with a miniPC (1x serial, 1x parallel, 1x PCI).
I want to log the following data:
RPM -- tachometer; will use a frequency to voltage converter
MPH -- speedometer; will use a frequency to voltage converter
CHT1 -- cylinder head temperature #1; it's a K thermocouple going to a digital gauge, so I could use the thermocouple signal (as long as it can be tapped into without affecting the gauge reading?) or the amplified 0-5 VDC signal going to the gauge.
CHT2 -- cylinder head temperature #2; same as #1, but the other head.
OT -- oil temperature (100-400F); it's a thermistor now, but could be converted to thermocouple if it makes more sense (lower cost).
AT -- ambient temperature (0-120F); could be thermistor or thermocouple, I haven't bought a sensor yet.
FT -- fan inlet temperature (0-120F); same situation as AT.
So, my options seem to be:
1. Two voltage signals (RPM & MPH) and five thermocouple signals (CHT1, CHT2, OT, AT, FT) or,
2. Four voltage signals (RPM, MPH, CHT1, CHT2) and three thermistor signals (OT, AT, FT)
I want to sample each channel at least 1 Hz.
Please help me flush out all the options and the advantages of each. Thanks for the help