IR Wireless Temperature Sensor With ATtiny85

Arduino is simple and very powerfull open source/hardware platform where only your imagination can stop you.A few days ago I read an instructable that inspire me to do my own.The instructable is about how you can send strings of data from one arduino to another.Everything is ok but I wanted to make it with Attiny85 .but unfortunately libraries are not supported with this microcontroller.So, I need to find a way how to generate 38khz and send modulated data and how to translate those data.I'm not enough pro :) to know how attiny85 to generate 38khz itself so I used old good one 555 timer.Everything is good but now I must to send data somehow.There are 3 possibilities:

1-By controling reset pin of the 555 timer

2-switching on/off power supply of 555 timer

3-switching on/off LEDs(timer is always on)

I used 3th variant.

Let's start!

Microcontrollers and timers:

1x555 timer

1xATtiny85(you can use any microntroller from Attiny family)

Resistors and trimers/pots:

1x10k

3x4.7k

1x22k

1x10k trimer/pot

Capacitors:

1x1nF

1x100nF

1x10uF/16v

Transistors:

Any pnp/npn transistors.In this project I used 1xBC547(npn) and 1xBC327(pnp)

Sensors:

LM35DZ couse it's easy to use

Regulators:

78l05(7805)

LEDs and transmitters:

Any IR leds.

You can use any ir receiver.Why??Because you can tune to the right frequence 555 timer with 10k trim/pot.

NOTE:

*To be exactly 38khz you must to tune trimer/pot around 7.979k or just mesure frequency with multimeter

*Supply voltage can be everything between 6.8v-30v
*Attiny85 is running at 16mhz internal oscillator

After you finished with circuit you must to upload some code..right? :D

In my project I used morse alphabet to send data.

There are two files, first one is little modified Morse library and the second file is main program.
I uploaded the code trought Arduino with tiny cores.
You can find it here:
http://code.google.com/p/arduino-tiny/downloads/detail?name=arduino-tiny-0100-0018.zip

It can be done a lot of optimizations.Because now you can only send numbers(in my case temperature).

Couple pictures how I integrated this circuit.

Basic characteristics:
-consumption:7-10mA
-range:3-6m

Next goals:

Single chip solution, less power consuption
Please comment and share your ideas for improving this device.
Thanks for reading!

btw: English is not my native language so sorry for mistakes and etc.