Instructables

Step 5: Assemble electronics

Picture of Assemble electronics
These steps are optional if you use an already built Arduino microcontroller. However, since you are only using a small amount of its capabilities it makes more sense to make a barebones version of an Arduino that is much smaller and cheaper to reproduce. This section might be slightly difficult for someone with no electronics experience, but should be easy for anyone who has assembled a simple electronics kit. A "schematic" sketch for the electronics is attached. The schematic is highly derived from David A. Mellis's Atmega8 Standalone schematic. If there is interest I will make a dedicated Instructable for this step. The decoupled power circuit is from Tom Igoe's Physical Computing book.

I included picture of the PC board version (with sensor/buzzer not connected) as well as a prototyping version built on a breadboard for reference. The breadboard version also shows how to connect the Arduino board as a USB programmer for the microcontroller chip. Since I used a DIP socket for the chip, I can also remove the chip and put it in an Arduino board to program it, but it can be tricky to pull the chip out without bending all the pins -- thats why i included the female header pins for the tx/rx. Even though the board is very cramped, you can see that all of the pins of the controller have a solder pad available to connect to. Since they aren't necessary for this project I did not solder female headers to the unused pins but if they were, you would have the full capabilities of an Arduino Diecimilia except on-board USB in a very small package. The width of the board is approximately one half of the Diecimilia board and about the same length. (here is a similar setup.) It is optional to use a transistor to power the buzzer, the Arduino can provide enough current from the pin itself. However, using the transistor allows you to use other sound making devices other than a buzzer if you have one.
 
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hi ! i want to make such goggles for my final year project... i wanna know that if its components are easily available in indian market? please let me know.... thanks
suneth (author)  palak.nayyar5 years ago
I am sure most of the parts should be available or could be shipped to India. You could use a different ultrasonic sensor and any version of the Arduino microcontroller.

This site seems to have some Arduino clones in India: http://www.bhasha.co.cc/
danbar5 years ago
hey could u please tell me mail me the electric components cause I can't identify the number and models please my e mail is dm_9990@hotmail.com
suneth (author)  danbar5 years ago
which components are you having trouble finding?
danbar suneth5 years ago
i dont know the name in english cause im mexican but mmm the black rectangle and the other thing with 3 legs that is also black but have some metal on top could u please tell me thei name in english and the number please
suneth (author)  danbar5 years ago
the black rectangle: [http://www.sparkfun.com/commerce/product_info.php?products_id=8846 ATmega168 with Arduino Bootloader]

or you can use any of these arduino boardsany of these arduino boards

the one with three legs: 7805 voltage regulator

danbar suneth5 years ago
thanks