DIY 100MHz Frequency Meter and Tachometer (ATTINY814).

It is a very mysterious and powerful device and its mystery is only exceeded by it's power!

Original description: https://tol.acritum.com/2110/attiny814-frequency-meter
Translation: https://tol-acritum-com.translate.goog/2110/attiny814-frequency-meter?_x_tr_sl=ru&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=wapp

All the parts were purchased on Aliexpress. If you use other parts, you can edit the FreeCAD source to modify the dimensions of the mounts or the box itself.

The printable OLED spacers may be needed to mount the screen as close to the TOP panel as possible (different manufacturers use slightly different PCB height, so it's not possible to predict what spacer height fits better until you install it and see - my oled looks good with 0.6 mm spacers).

I used Micro USB as power source just because I have a lot of old unused Micro USB cables, so I used one for this project. If you need Type C, then buy Type C.

My inputs are holes. If you want pins, then buy pins.

Screws: 2x5 mm (12 pcs).

If you need a front label with the pin names, it is attached here as well. Print it with 19 mm width.