Hello all,
I've got one simple picaxe project under my belt (stepper drive for washing machine timer replacement) - time to learn a little more and do something a bit more interesting.
I have an older customized car that has been outfitted with a modern engine. I've taken the original speedometer and replaced it's old mechanical cable driven drive with a modern stepper drive from a Lexus that accepts a 5v pulse signal from the on board computer.
The above rendered the old mechanical odometer inoperable. My plan is to get a 4D systems OLED display and mount it at the bottom of the speedometer to display various data. The plan is to have an odometer, trip meter, maybe digital speed readout, possibly other sensor data, as well as turn & bright lights indicator icons (because the originals are difficult to see when the wheel is tilted to driving position) --- I also am planning on a selectable display (and trip reset) via momentary pushbutton switch.
The speedometer signal is a 5v square wave that at 150mph (240kph) pulses at a frequency of about 200hz - I'm figuring this will be my upper boundary.
Displaying various data on the OLED seems pretty straight forward, as does gathering most of the information (ADC for various sensors, digital input for turn and bright indicators).
The question I have is, what would be a good strategy for the odometer?
The signal feeding the speedo is 4531 pulses per mile. I'm almost thinking a dedicated controller or chip of some sort would be best suited to collecting these pulses and recording them as miles.
Anyone have any thoughts? Is a picaxe suited to this task or is there a better option for the odometer/pulse counting portion? Should I be looking at a single or two chip solution? I'm planning on using a 20X2 picaxe as my main interface to the OLED.
I've got one simple picaxe project under my belt (stepper drive for washing machine timer replacement) - time to learn a little more and do something a bit more interesting.
I have an older customized car that has been outfitted with a modern engine. I've taken the original speedometer and replaced it's old mechanical cable driven drive with a modern stepper drive from a Lexus that accepts a 5v pulse signal from the on board computer.
The above rendered the old mechanical odometer inoperable. My plan is to get a 4D systems OLED display and mount it at the bottom of the speedometer to display various data. The plan is to have an odometer, trip meter, maybe digital speed readout, possibly other sensor data, as well as turn & bright lights indicator icons (because the originals are difficult to see when the wheel is tilted to driving position) --- I also am planning on a selectable display (and trip reset) via momentary pushbutton switch.
The speedometer signal is a 5v square wave that at 150mph (240kph) pulses at a frequency of about 200hz - I'm figuring this will be my upper boundary.
Displaying various data on the OLED seems pretty straight forward, as does gathering most of the information (ADC for various sensors, digital input for turn and bright indicators).
The question I have is, what would be a good strategy for the odometer?
The signal feeding the speedo is 4531 pulses per mile. I'm almost thinking a dedicated controller or chip of some sort would be best suited to collecting these pulses and recording them as miles.
Anyone have any thoughts? Is a picaxe suited to this task or is there a better option for the odometer/pulse counting portion? Should I be looking at a single or two chip solution? I'm planning on using a 20X2 picaxe as my main interface to the OLED.