They would be even more cool if they had flashing red eyes like you sometimes see in movies.
This project shows how I did just that.
Step 1: Collect Your Tools and Parts
No programming needed.
Fairly simple circuit.
One day project for the whole family.
Electronics parts list:
1- CMOS 555
1- 100K resistor ( Brown Black Yellow Gold )
1- 1.5M resistor ( Brown Green Green Gold )
1- 0.1uf capacitor ( Usually marked 104 )
2- Red LED
1- 3 Volt battery ( Photo battery )
1- Proto board
Bat Parts List:
1- 9 X 12 X ¼ Black Foam Sheet per bat.
Neon Sharpie Markers.
Single hole Paper punch
Needle nose pliers
Dremel or saw
Step 2: The Electronics
The parts for this project are pretty straight forward.
If you don’t already have most of these parts around you can get them all at radio shack.
Step 3: Schematic
If the schematic gives you a hard time check out the other pictures of the circuit to get a feel for how I put it together and go from there.
Step 4: Lets Get This Circuit Built
Install the Cmos 555 chip and solder it in place
Solder the other side to the leg of the 1.5 M resistor that goes to pin 7.
I just set it on the board and marked it up with a pencil.
It is a good idea to tin (coat in solder) the wire so it will not corrode as easily.
The wires will not be soldered in just yet.
Tin a small piece of wire and solder it between pin 6 and all of the leads coming through by pin 2.
Install them with the negative toward the top (away from the battery) of the board.
I found it was easiest if I put the leads through the board where I wanted them and bent the leads to the side. Then I removed one of the leds so I didn’t have to fight two at one time.
Then install and solder the other led.
Mine went through the board a little and I used the battery to determine how long they needed to be.
Trim and solder them.
Solder a tinned wire from pin 1 down past the capacitor to the negative battery clip.
Don't forget to solder the capacitor in here too.
Keep this wire as much under the battery area as possible so we can add some wires to keep the battery in place.
Step 20: Electronics Complete
Install your battery.
If everything is done properly the leds will begin to flash.
If things are not working properly check to make sure everything has been soldered and your jumpers are all where they should be.
Now install a few wires to help hold the battery in place and add a small loop near the top to hang it from.
With a fresh battery this circuit should blink for a few weeks or more.
I have one of these that has been blinking for over two weeks and it is still going strong.
Step 21: Batty Ideas
This is where your own personal creativity really comes in to play.
Figure out a design for a bat that you really like.
If you have kids like I do have them help.
Here are a few examples.
Step 22: Make a Bat Pattern
Make sure the body of the bat is going to be large enough to hide the electronics board before you cut it out.
I found it was easier to get a symmetrical bat if I folded the paper in half.
Draw half of the bat then trace the other side and cut it out.
Step 23: Trace It and Cut It
Step 24: INSTALLING THE FLASHING EYES
Once you have the bat cut out lay the board on the bat where you want the eyes to be.
Carefully but firmly press down behind the area of the leds.
This will make two indentations that should remain in the foam board long enough for you to line up the hole punch and presto you have holes for the eyes.
Step 25: Finishing Touches
I decided the bats would look really cool if they were colored to glow under black light.
I found some really interesting neon sharpie markers that said they would glow under black light.
After we had all of the bats cut out but before installing the flashing eyes everyone colored their bat.
The markers are a little expensive but worth it for the added effect.
Once you have all of your bats set up, install the led eyes and watch out so you don’t get too scared.
Have a fun and safe Halloween.