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ATtiny84 Tiny Calibrator

OSC Calibrator and High-Voltage Fuse Resetter for 8-Pin ATtinys based on ATtiny84

stefan-wagnerStefan Wagner
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attiny attiny13 attiny85 Attiny84 avr oled programmer fuse attiny44 arduino pcb

This project was created on 12/27/2020 and last updated 6 months ago.

Description

Because the 8-pin ATtinys only have a few GPIO pins available, they are usually operated without an external clock. The internal oscillator does a good job in most applications, but when it comes to precise timing, its +/-10% accuracy is often insufficient. Fortunately, the oscillator can be calibrated, increasing its accuracy to +/-2% or better. There are a few ways to perform this manual calibration, but several steps are required. The TinyCalibrator does this fully automatically by a push of a button. In order to make the device more versatile, a high-voltage fuse resetter was also integrated, with which "bricked" ATtinys can be reset to the factory state.Description and project files: https://github.com/wagiminator/ATtiny84-TinyCalibrator

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apollogibbons wrote 06/05/2021 at 21:37 • point

the SS-12D10L5 switch is not the correct size. It is to big. Might want to recheck your BOM I have 10 switches that are useless now.

  Are you sure? yes | no

Stefan Wagner wrote 06/08/2021 at 16:56 • point

Oh yes, you're right. I corrected the BOM. Thank you for the hint!

  Are you sure? yes | no

fuchsiv wrote 05/17/2021 at 20:59 • point

Hi Stefan, thanks for this great product. As the 0603 SMD parts are to small for me to solder them by hand, I am thinking of let them assembling by a PCB company. The basic costs are quite high and it makes no price difference to let assemble a few more.
Is it ok for you, when I order 5 or 10 pcs (I need one or two) and give the rest of the boards to interested people at roughly cost price?
Thanks Markus

  Are you sure? yes | no

Stefan Wagner wrote 05/18/2021 at 18:35 • point

No problem!

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k1200s wrote 03/13/2021 at 00:33 • point

Can you please tell what is the USB pwr connector part number, or reference?

Thanks!

  Are you sure? yes | no

Stefan Wagner wrote 03/13/2021 at 19:24 • point

https://aliexpress.com/wholesale?SearchText=micro+usb+2pin+dip

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killua wrote 01/20/2021 at 00:33 • point

Great one, I could use it.  I made minor changes to my board: jumper 5v and omitted the 3.3v regulator and its 2 capacitors.  I haven't needed to use any of my ATtiny x5 in low voltage, always used 5v

  Are you sure? yes | no

Stefan Wagner wrote 01/21/2021 at 16:26 • point

Thank you. Many of my projects are powered directly by batteries. That's why 3.3V makes sense for me.

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medpixman wrote 12/30/2020 at 14:28 • point

Can you sell them?

  Are you sure? yes | no

Stefan Wagner wrote 12/30/2020 at 17:02 • point

Unfortunately, I don't have the time to make and sell a meaningful amount of boards.

  Are you sure? yes | no

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