Nixie Gear Indicator Shines Vivid

Whenever you’re driving a automotive with a stickshift, it’s fairly straightforward to maintain observe of which gear you’re in. That may be a bit of bit harder on one thing like a motorbike with a sequential shifter. [decogabry] constructed a neat gearshift indicator to unravel this subject.

An ESP32 devboard is used because the mind of the construct. It’s paired with an ELM327 dongle over Bluetooth, which is ready to hook into the bike’s ODB diagnostic port to select up information like engine RPM, wheel pace, and coolant temperature. The primary two elements are mixed as a way to calculate the present gear, for the reason that ratio between engine RPM and wheel pace is set immediately by the gear choice. The ESP32 then instructions a Philips ZM1020 Nixie tube to show the gear, driving it by way of a small nest of MPSA42 transistors. A separate self-contained energy provide module is used to take the bike’s 12 volt provide as much as the 170 volts wanted to run the tube. There’s additionally a small four-digit show used to indicate standing info, RPM, and engine temperature.

Notably,  [decogabry] made this construct relatively versatile, to go well with any bike it may be put in upon. The gear ratios aren’t laborious coded in software program. As a substitute, there’s a easy studying routine that runs the primary time the system is powered up, which compares RPM and wheel pace throughout a steady-state journey and saves the ratios to flash.

We’ve featured tasks earlier than that used totally different methods to realize related ends. It’s additionally fascinating to invest as as to if there’s a motorbike classic sufficient to go well with a Nixie show whereas nonetheless having an ODB interface on board as commonplace. In the meantime, in case you’re cooking up your individual neat automotive builds, don’t hesitate to drop us a line.