Post by thread:Help for lagging project

I am TRYING to build an ECU for a model jet engine which I have built. The main features are that the pick has to read in two 1 - 2 ms pwm input from a r/c receiver, read in the temp of the engine, and create the pwm output for the motor control. This is looking like is going to be beyond my scope, so can anyone help me out on this one. I have got the read of the r/c inputs to kinda work and the output creation is fine, but i cannot seem to get things right. I am a programmer by trade, and know what i want to do, but am having difficulty getting these idead into assembler Is ANYBODY outthere able to help me PLEASE

> I am TRYING to build an ECU for a model jet engine which I have built. > > The main features are that the pick has to read in two 1 - 2 ms pwm input > from a r/c receiver, read in the temp of the engine, and create the pwm > output for the motor control. > Without more detail it sounds like you are trying to create an output pwm value conditional on 2 input variables, being temperature and drive pulses from an R/C channel. The temperature obvoiusly dictates what happens to the input pwm before it becomes the new output pwm. The input pwm will need to be measured, converted to a handy offset value (as in min=0, max=nbits). The input temperature is put through a lookup table to produce the other factor and then the two values are multiplied together. This new value will be the PWM that you need. The lookup table values will have to be determined by what you need to multiply the input by at a certain temperature to get the desired output. Sounds a bit vague but I cant be more specific without more detail. P.S. Fuzzy logic is very good at this sort of thing. _____________________________ Lance Allen Technical Officer Uni of Auckland Psych Dept New Zealand http://www.psych.auckland.ac.nz _____________________________

Most folks just use an ESC to control the fuel pump. I've seen Astro 212D's in exactly this setup. If you are looking for a PID control algorithm, I'd still suggest you stick with the Astro. I'm working on an auto throttle control for Electric Jets. Where are you located? The Toledo show is coming up first weekend of April, and guys like Top Gun will be there (right next to the booth I'm supposed to work at, SubTech). Look inside one of their jets. See what "the competition" is doing. Andy

Just this past weekend one of my friends flew his turbine with a New ECU that he had got from Germany. It is a very impressive unit with a detachable keyboard and LCD, lots of built in safety features too. Email me privately if you want more info. {Original Message removed}

You might try one of the C compilers. I personally reccomend CC% at http://www.bknd.com. He has a free version that will compile programs up to 1k in size. -Erik At 10:42 PM 3/8/00 -0600, you wrote: >Just this past weekend one of my friends flew his turbine with a New ECU >that he had got from Germany. It is a very impressive unit with a detachable >keyboard and LCD, lots of built in safety features too. Email me privately >if you want more info. > >{Original Message removed}