OK, first of all, I love learning about this electrical stuff because I am an engineer at heart; therefore I have taken on the challenge of setting up my own sensor files per the WIKI directions and I have a few questions. Please don't tell me just to buy the dynon supported sensors, becuase then I wouldn't learn anything
1. What is the purpose of the pull-up resister settings ("low_resistance=" & "high_resistance=") in each sensor file? Is this an internal thing or do I need to install an in-line (in-series) resister for each "standard" (config A) general purpose pin sensor that would correspond to the pull-up number in the sensor file. As the wiki direction state, every config A General Purpose pin must have a pull-up resister setting (not "NONE") but the installation manual doesn't mention installing resisters into your sensor signal wires. If it is strictly internal (no installaton of a resister), what is the philoshophy or effect of different values from high to low (sensitivity, noise, etc)? Example; My Van's resistive fuel senders go into pins 20 and 21 and the sensor file indicates a 200 ohm pull-up on the low_resistance line. Do I need to install a 200 ohm resister in the line coming from the fuel sender?
2. I have an Air/Fuel ratio gauge that outputs 0 to 5 volts for it's signal that I would like to display on the Dynon. I have hooked it up to pin 31 (config C). This sensor has no units so I assigned it the "function=position". I plan on calibrating it so it wll display the correct value without any unit. Is this the best way to have a unitless sensor? Can I calibrate it using the Dynon wizard instead of my proposed process below?
3. I plan on calibrating all my non-Dynon supported sensors by initially setting the sensor file with C_x1=1, and all others zero. I will then record the readings (which I am guessng will be the raw voltage of the sensor) and plot them against the calibrated value gained from other accurate instrumentation. I can take that data and create a polynomial equation to put into the finished and calibrated sensor file coeficients. Is this the best course of action or is there a better way?
1. What is the purpose of the pull-up resister settings ("low_resistance=" & "high_resistance=") in each sensor file? Is this an internal thing or do I need to install an in-line (in-series) resister for each "standard" (config A) general purpose pin sensor that would correspond to the pull-up number in the sensor file. As the wiki direction state, every config A General Purpose pin must have a pull-up resister setting (not "NONE") but the installation manual doesn't mention installing resisters into your sensor signal wires. If it is strictly internal (no installaton of a resister), what is the philoshophy or effect of different values from high to low (sensitivity, noise, etc)? Example; My Van's resistive fuel senders go into pins 20 and 21 and the sensor file indicates a 200 ohm pull-up on the low_resistance line. Do I need to install a 200 ohm resister in the line coming from the fuel sender?
2. I have an Air/Fuel ratio gauge that outputs 0 to 5 volts for it's signal that I would like to display on the Dynon. I have hooked it up to pin 31 (config C). This sensor has no units so I assigned it the "function=position". I plan on calibrating it so it wll display the correct value without any unit. Is this the best way to have a unitless sensor? Can I calibrate it using the Dynon wizard instead of my proposed process below?
3. I plan on calibrating all my non-Dynon supported sensors by initially setting the sensor file with C_x1=1, and all others zero. I will then record the readings (which I am guessng will be the raw voltage of the sensor) and plot them against the calibrated value gained from other accurate instrumentation. I can take that data and create a polynomial equation to put into the finished and calibrated sensor file coeficients. Is this the best course of action or is there a better way?