SparkFun Forums

[tahikib]

I want to create a pcb the can plug directly into a usb port and when it starts up with have scrolling text with a message. Could anyone help me with ICs and pieces needed

[skimask]

USB connector, LCD, wires, etc...

[Ross Robotics]

Are talking about a USB device that when plugged in to a PC, it will automatically open Notepad and start typing? A while back I found several websites that released their files as freeware. Might want to try Google..

[Mee_n_Mac]

Yup, IIRC there was an article on HaD, not more than a year ago, where someone had put an ATtiny on a PCB that plugged into a USB port. Upon boot it did "stuff".

[Ross Robotics]

Yup. The one I found was used as a business card. You plugged it in and it automatically open your default browser and opened up the website. Thought is great. I have that project on my To Do List, but right now, I have too many projects started..

[tahikib]

It will sorta of be like a business card. Only show static information.

I ordered a 128x64 OLED similiar to this one

I want to make it compact as possible maybe a little larger than a USB flash drive.

[Picbuster]

Hi,
Small as possible will 15 x 20 mm including all connectors do?
if so; use FTDI + pic16f6XX or pic 18(l)f k22 series( 4x4 mm QFN package) and 0603 stuff.
Total Power <200mA use mcp1703 10uA quiescent current.

Picbuster

[tahikib]

So I bought a Small OLED 128x64 SSD1306 i2C and a SPI version. I also got attiny85 ICs

The screen will run on 3.3v and the attiny at 2.7v. Could I use this SparkFun 5V Step-Up Breakout - NCP1402 or SparkFun 3.3V Step-Up Breakout - NCP1402 to run these off of CR2032 3.0V Coin Battery? I only need to to run a a few days.

I decided to go with a battery as I don't want them to have to plug it in to see it.

These are for Groomsmen invites.

[Picbuster]

a cr2032 will deliver 3v 220mA/H = 0,66Watt
the display will do 25mA approx add step-up and cpu to it.
lets say 45mA total 220/45 =4H however 100% empty won't work take 65% give you best case 2,5H approx.
conclusion cr2032 is not sufficient.

[tahikib]

a cr2032 will deliver 3v 220mA/H = 0,66Watt
the display will do 25mA approx add step-up and cpu to it.
lets say 45mA total 220/45 =4H however 100% empty won't work take 65% give you best case 2,5H approx.
conclusion cr2032 is not sufficient.

I am okay with 2hrs. So I should just add a USB receptacle. They all have micro USB cables from phones. Would that work? I am trying to keep the project under $15 each.

Again thank you Picbuster for you info.

What if I use 2 CR2032 in parallel? If i use them in a serial I would have to get a 5v voltage regulator correct?