Attiny serial monitor using arduino walkthrough

Allllllllllright dudes and dudets. Here is whats up, we're going to make attiny and arduino bestest of friends.

If you have ever worked with capacitive switches you know how much it makes you want to smash your face into a wall...Now imagine you have no way to monitor output, well that is what I was running into. Problem is you can never know what the output is with stock settings of an attiny. So my solution comes from the good boys/gals of MIT. However, It's not super clear on their walkthroughs so I thought I would provide a more in depth explanation.

Step 1: W-w-w-wire it up

Lets set up a little basic “hello world” type example. Wire your arduino like the following:

1. Make sure you connect a 220Ω resistor between pin 3 and Tx(transmit) input of arduino. Resistors aren't directional so it doesn't matter which way you insert it.

2. Now put a 10uF capacitor between ground and reset with negative going to ground and positive to reset

If you do not do this, you could damage your board/attiny or make the universe implode. (refer to pictures above). SO SERIOUSLY, IF YOU MAKE THE UNIVERSE IMPLODE I WILL FIND YOU IN A PARALLEL DIMENSION AND PUSH YOU IN TO A DEEP PUDDLE OF WATER, AND YOU WILL HAVE TO WALK HOME WITH WET SOCKS.

Comments

[manu08]

Hi, nice tut btw. Still I have some questions. Why are you setting attiny like that as oppose to http://hlt.media.mit.edu/wp-content/uploads/2011/06/Screen-shot-2011-06-06-at-1.46.39-PM.png. Do you send your sketches just by one wire?

[hilukasz]

Manu, this is for reading/sending serial via MISO and MOSI pins, not programming. What that diagram shows is how to program the attiny45/85, they are two very different things. As far as I know you cannot program via TX/RX pins

[Dantex]

I have arduino mega2650 wich doesn't support working as ISP programmer

bu i have bought USBtinyISP wich is suported in arduino IDE

but I dont know how to programm attiny85v via USBtinyISP!
some help?

[hilukasz]

that's not true at all. mega2650 should support ISP mode, just have to make sure you have reset jumper in since the IC is not removable.

[N.fletch]

I'm in a quiet office and the wet socks bit made me burst out laughing...

[hilukasz]

:)

[tigerbomb8]

On the UNO there should be a 10 uF cap between reset and and ground.

[Veda88]

I don't know what was before in the instructable, but I always use a 120 ohm resistor between reset and 5v for my duemilanove. Works great.
Source: http://playground.arduino.cc/Main/DisablingAutoResetOnSerialConnection

[hilukasz]

ah, you're totally right. I was using a few sources for this. But MIT one also says 10 uF, so I will go with that. thanks for the catch.