ATtiny85 + bitmap + OLED

[undefined0x0]

Hi all,

I would like to show a bitmap on an oled and power the project with a CR2032 battery. I have searched the internet for a while and it's hard to find information.

If someone kind could point me in the right direction I would be very grateful:)
(Maybe the ATtiny85 is not the way to go?, I checked out Digisparks ATtiny but it requires 5V)

Best regards,

[TomGeorge]

Hi, @undefined0x0
Welcome to the forum.

Please read the post at the start of any forum , entitled "How to use this Forum".

How to get the best out of this forum

See also FAQ - Arduino Forum for general rules on forum behaviour and etiquette. Hello, Welcome to the Arduino Forum. This guide explains how to get the best out of this forum. Please read and follow the instructions below. Being new here you might think this is having rules for the sake of rules, but that is not the case. If you don’t follow the guidelines all that happens is there is a long exchange of posts while we try to get you to tell us what we need in order to help you, which is fru…

Have you googled;

attint85 oled

You will need an I2C Oled display, however I would doubt if a button cell would be able to power the project or last very long.

Can you tell me the application?

Thanks.. Tom...

[undefined0x0]

Hi @TomGeorge,
Thank you!

Yes I have searched and it looks like it is possible since people are using the tiny85 for a lot of projects. Like this one

So it should work with a button cell.

Application is just to use the minimum amount of parts and code to make a standalone compact stack of a Battery, Microprocessor and an Oled-display that can store an image.

There are projects like this one: This project uses the ATtiny85 from digispark. But as I mentioned earlier it needs 5v.

[anon35827816]

@undefined0x0

So it should work with a button cell.

It would, but briefly. Don't underestimate the power requirements of an OLED. It'll drain a button cell in no-time.

@undefined0x0

the ATtiny85 from digispark. But as I mentioned earlier it needs 5v.

In itself an ATtiny85 runs fine on 3.3V. You could modify a Digispark module to run on 3.3V, but frankly, I'd just start over and make one yourself; it would allow you to keep the parts count down to the bare minimum as you desire while also minimizing physical footprint (I assume this is relevant since you intend to use a button cell).

However, in any case, a button cell paired with an OLED is not something that will have much practical relevance given the short run time it will allow. Kind of a waste of perfectly good button cells, too.

[undefined0x0]

@anon35827816

Thank you for your answer!

@anon35827816

In itself an ATtiny85 runs fine on 3.3V.

Ok!

@anon35827816

I'd just start over and make one yourself;

Agree, I want to understand the microprocessor.

@anon35827816

minimizing physical footprint (I assume this is relevant since you intend to use a button cell).

Yes, correct.

These guys over at Tiny Circuits uses a LITHIUM ION POLYMER BATTERY - 3.7V 290MAH and that is probably a better solution(?). I then have to make use of the "JST SH connector" and also get a recharger.

Might this be the right approach?

[anon35827816]

Yep, that may work. You can get an estimate of how long the battery may last by determining how much current the display draws. It depends on what you show on it of course, so it'll be a ballpark figure only. But with 290mAh you'll get at least some running time before it goes dead.

[undefined0x0]

Ok cool! I'll try it out!