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Summary of change:
'''Easytherm is a tool that helps making curves from a few calibration points for an NTC temperature sensor.''' The coolant and manifold air temperature sensors are (in 99.9% of cases) NTC type. The ExhaustGasTemp sensor can never be an NTC type. Easytherm files are located in the files section of the Megasquirt group at http://groups.yahoo.com/ '''Steps:''' * if possible, 3 calibration points must be measured. Say, at sensor temperatures ** 95C warmed engine ** 20C cold engine ** and 0C (a cup of icy water before installing the sensor to the final location) * Check pullup resistor values, v3.2 has '''2.7k''' resistor instead of 2.49k used in megasquirt. If incorrect pullup value is used, there will be a few degrees error in the lower temperature range. * .inc file can be generated with easytherm, or other means. This is a very simple function, a few lines. * note: (AFAIK) MSToolsII can also be used to create .inc files * but: the upload function in MSToolsII is NOT compatible with GenBoard. GenBoard's has it's own firmware generation and upload procedure. '''The .inc files need a slight automatic formatting''' (into .c files) '''with the following commands, so that they will actually be used in the firmware build process''': * ''perl bin/inc2tbl NAME-OF-THE-MAT-INC-FILE > etc/airdenfactor.c'' * ''perl bin/inc2tbl NAME-OF-THE-CLT-INC-FILE > etc/thermfactor.c'' * See GenBoard/FirmWare for firmware compiling and uploading ---- '''Developer TODO''' - to make some of the above few simple steps automagic: * add makefile entries, so inc2tbl is automagically run if etc/airdenfactor.inc is newer than etc/airdenfactor.c * likewise for etc/thermfactor.c * generate etc/airdenfactor.inc from simple text-based etc/airdenfactor.cal textfile of a few calibration points (containing Celsius => whatever) * update the above steps to match
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