Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - I have built an in-dash head unit graphical mpguino display

skybolt · 01-11-2017, 07:14 PM

I'll reply in more detail, but basically:

- I have a replicatable mpguino shield working with the Mega, in the car.
- josemapiro: the GUI works with any unix/linux computer that can read serial input. It even works on my mac! In theory there's no reason it couldn't use windows as long as python runs on it and I can figure out the syntax of reading from a serial port. The example is a raspberry pi and a small attached screen, but the goal is to use video output and show it over the head unit or other built in video screen in the car.
- I have a workaround for the scale bug, and have isolated the bug but haven't fixed it
- next step for me is to duplicate the shield in soldered form, get the code to run on a pro micro, properly (given the 8MHz clock speed).
- I'm seeing anomalous readings in the Mega, which is probably just because I don't understand all the parameters and how they affect calculations. (injector PSI for example). On the mega readings are about 5-10% too low (classic mpguinio reads about .42 gph at a idle, Mega reads about .39 gph.
- No matter what I do to reset the Mega's trip and current, my tank miles stays at 8.8. Will do further experiments in house (not in car) and it will be easier to start investigating.

01-11-2017, 07:14 PM	#47 (permalink)
skybolt deviant Join Date: Oct 2016 Location: Seattle, WA Posts: 69 s2k - '02 Honda s2000 Thanks: 12 Thanked 47 Times in 35 Posts	I'll reply in more detail, but basically: - I have a replicatable mpguino shield working with the Mega, in the car. - josemapiro: the GUI works with any unix/linux computer that can read serial input. It even works on my mac! In theory there's no reason it couldn't use windows as long as python runs on it and I can figure out the syntax of reading from a serial port. The example is a raspberry pi and a small attached screen, but the goal is to use video output and show it over the head unit or other built in video screen in the car. - I have a workaround for the scale bug, and have isolated the bug but haven't fixed it - next step for me is to duplicate the shield in soldered form, get the code to run on a pro micro, properly (given the 8MHz clock speed). - I'm seeing anomalous readings in the Mega, which is probably just because I don't understand all the parameters and how they affect calculations. (injector PSI for example). On the mega readings are about 5-10% too low (classic mpguinio reads about .42 gph at a idle, Mega reads about .39 gph. - No matter what I do to reset the Mega's trip and current, my tank miles stays at 8.8. Will do further experiments in house (not in car) and it will be easier to start investigating.