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I built a 4R70W Ford transmission controller a few years back and its been working flawlessly. Using a 20x2, measuring input pulses from a speed sensor over a set amount of time. That time give me a 1 to 1 ratio for pulses to MPH. On 2 occasions the controller locked up and defaulted in what...

In my transmission controller (Ford 4R70W) I decided to add electronic pressure control back into the mix. I've been running max line pressure now for a year and would like to soften up the shifts a little. I also saw there was an unsed PWM pin (C.5) which I'm now using to ease in the torque...

Here is my interrupt routine to measure the input pulses from a vehicle speed sensor. How long does this routine take to process? At 65 mph it receives 65 pulses in 0.350 seconds. At what input frequency does it begin to miss input pulses? interrupt: if toflag = 1 then 'check if interrupt...

Is there a way to get more than 128 bytes for holding hser input data? I want to build a data logger to receive data from a ucontroller and store it to a SD Card. The incoming data size is 208 bytes. I only need about 50 bytes of that whole string of data. Can this be accomplished with a...

Looking at the 20x2 page I see there have been 3 revisions from C.0. In the revisions page it doesn't list when the bugs were found and when the fix was implemented. Is there a way to return bought 20x2 chips and have them upgraded to the latest rev? Of the 4, 20x2's I've bought they have all...

I built for my capstone project before graduating ITT Tech a late model transmission controller. I'm a Ford guy and own several Ford Falcons. My daily driver is a1964 Falcon stationwagon. Controlling a 4r70w transmission is quite simple. 2 shift solenoids provide the 4 forward gear...

I'm using a 20x2. I'm trying to read a speed output into pin C.2 ADC8. My conditioning circuit works fine on the bench and my DMM is showing proper voltage. When I connect the analog voltage to the 20X2 pin C.2 to voltage level at the processor falls really low. 0.050 volts or so. What is...

I need to receive an input pulse from an RC receiver, then set an output DAC 0 to 5 volts which will correspond to the 1000us to 2000us pulse in range. Then send a slightly different servo command to the servo. I'd use the DAC output on the 08M2 but I need better resolution than 32 steps. It...

I'm a noob.. I'm having mental issues trying to add hysteresis into some code I'm playing with. Using a 20x2 to display speed in MPH on to 3, 7 segment displays. I'm using the pulsin command to measure the time between high to low transitions from a hall effect sensor and a magnet mounted on...

I'm trying to measure the time between raising edges but allowing the code to continue on if there is no input to the selected pin. I would use settimer but it is only an internal timer with the 20X2. I'm playing around with an air ride set up and noticed the code runs slow using the pulsin...

Using a 20X2. I want to count on pin6 for 1 second. Readings will be from 0 to 140 hz and are stored in b6. I want to jump to parts of my code if the change in hz is eighter within or outside a rate of change. If the count changes more than ie. 5 from one second to the next then flash_1...

I need a better handheld explination of how to right and understand the way a lookup table is used in programing. I've wrote a code for the 20M to control a airride system in a car. I would like to have 4 set ride heights based on the speed of the vehicle. I've started with the following...

I have the idea for several years but could never get the project started. I then found this website and downloaded the code editer and manuals. After 2 days of tinkering on my down time I was able to write some code to control ride hieght based on vehical speed. I want to use the 20M IC and...