Connect with us

Hi, what are you looking for?

Tweaks

TonyTacho Is The Best Device For Rotational Speed Measurement Without The Bulk

An electronic tachometer is a straightforward enough device, in which the light reflections from a white spot on a rotating object are detected and counted over time, measuring the revolutions per minute (RPM). It’s a technique that has its roots in analogue electronics where the resulting pulses would have fed a charge pump, and it’s a task well suited to a microcontroller that simply counts them. But do you need an all-singing, all-dancing chip to do the job? [Stefan Wagner] has done it with a humble ATtiny13.

His TinyTacho is a small PCB with an IR LED and photodiode on one end, a small OLED display on its front, and a coin cell holder on its rear. The electronics may be extremely simple, but there’s still quite some effort to get it within the ATtiny’s meagre resources. Counting the revolutions is easy enough, but the chip has no I2C interface of its own and some bitbanging code is required. You can find all the design files and software you need in a GitHub repository, and he’s put up a video of the device in action that you can see below the break.

Tachometers are a popular project hereabouts, and we’ve featured a lot of them over the years. Perhaps the best place to direct readers then is not to another project, but to how to use a tachometer.

Image Source: hackaday

You May Also Like

Tweaks

It’s common knowledge that Windows XP won’t run on a 386, or Windows 95 on an original IBM PC. However, with the latest releases...

Tweaks

Apple previously supported a “Right to Repair” bill in California but is now opposing a similar bill (Senate Bill 1596) in Oregon due to...

Tweaks

San Francisco is fighting to stop self-driving cars and taxis from operating in the city. Despite getting the green light from the authorities, the...

Tweaks

Back in April 2023, Microsoft had announced they would stop selling their own branded peripherals such as keyboards and mice to focus on Surface...