Obd2 boost gauge

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When I was a teenager I was very interested in motorsports and especially in rallying. Maybe because those cars looked exactly like road cars and I believed that I could just walk into any car dealership and buy one. To some extent that was true: there were indeed racing regulations asking manufacturers to produce and sell those cars to the public to be allowed to race, but only a few actually did that. I was particularly fascinated by that blue Subaru with the famous three yellow fives and of course I wanted one. I don't know why that one, the other ones were good too, but that one was the one I fell in love with. For a teenager like me, that was still beyond reach and I had to get by with a much cheaper small motorbike. Many years went by and one day I went to the car dealership with my wife to buy a new car for her.

Obd2 boost gauge

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Only one line is needed to drive them and is connected to pin D10 of the Arduino.

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Obd2 boost gauge

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Pearls peril

When coasting the intake manifold has about —70 kPa vacuum displayed by seven blue LEDs left. The brightness of the display is adjusted between a minimum and maximum level according to the ambient light sensed by the photo-resistor with a linear interpolation in-between. Fortunately, Subaru has been kind enough to provide switched battery power on pin 8. The LED ring temporarily wired during the development phase. It works equally well as the microcontroller doesn't have a lot to do to process the data. So, this gauge visualizes what the turbo is doing and provides a similar feedback. So, I cut the connector casing much shorter, mounted the whole interface in another small plastic box and I used a 30 cm long cable to connect them. It's not a necessary instrument; it's just nice to have it. The transparent glass was initially 3D-printed as well, but I ended up turning a piece of PMMA Poly Methyl MethAcrylate or acrylic glass into a disc in my lathe because is more transparent. But in "I" mode, boost increases quite slowly. I used about 10 cm of 2. So, to avoid making the gauge too bulky, I decided to separate the LED ring from the rest of the circuit and connect it with a 1 m long 4-wire black telephone cable.

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It's a pity. The circuit is really simple and in terms of electronics there is nothing to write home about. The OBD-II male connector that came with the converter can be reused, but the original case was too long and interfered with my legs while driving. I like this solution because it's cheap, because wires can directly be soldered on its comfortable 2. If the positive pressure exceeds the number of pixels one full turn, kPa , a second loop is displayed in yellow over the already present red one. The firmware program used for this application is available here as freeware : boost-gauge-firmware. All items can be imported for very cheap. By the way, you need a powerful soldering iron and a wet sponge: as soon as the wire is soldered to the 78M05 cool everything down by rubbing the wet sponge on the wire and on the regulator. I still find hard to believe that the internet is not flooded with DIY gauge projects, but I couldn't find a single one. The engine is a bit "old style": the turbo has some lag and needs some revs to spool up, but that "kick in the back"quot; you get when you reach 3' rpm is really funny, it makes me smile every time. Resetting the trouble codes made the light go away, but reconnecting the gauge made it show up again shortly after. Exclusive With its industry-leading Performance Software for the 2. Now that the problem is solved, the button is not needed anymore and can be omitted.