How to do

How to do
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Build a Basic Infrared Motion Alarm

infrared alarm


Are someone trying to steal your favorite pen, or gadget? Or you need a simple but effective sensor alarm?

The “PIR Sensor Arduino Alarm” is a great idea for both! And it’s easy to be handmade.

The component you need you can find at home. Software program is provided also.

You can build this handmade alarm into an enclosure box of your own design.

See the video to understand how to do that



How to make SQUISHY CIRCUITS – idea for Halloween

What you need:

  • flour – you need about 3 cups
  • salt (its beter to be iodizen) – you need about ¼ cup
  • sugar – about ½ cup
  • tap water – 1 cup
  • distiled water – about ½ cup
  • food coloring
  • cream of tartar – about 3 tablespoons
  • vegetable oil – about 4 tablespoons
  • saucepan – 3/4
  • sturdy spatulas – two
  • waxed paper
  • battery – one 9 volts
  • cups and spoons – dry and liquid measuring
  • medium ceramic or stainless-steel mixing bowl – one
  • wire leads with alligator clips on each end – two
  • 3-to-5-watt component LED bulbs in a variety of colors


What and how to do

At first you should create the Conductive Dough

Step 1. Combine the dry ingredients in the saucepan: 1 cup flour, ¼ cup salt, and 3 tablespoons cream of tartar. Add 1 tablespoon vegetable oil, food coloring of choice, and 1 cup tap water and stir with a spatula.

Step 2. Place the pan over low to medium heat and stir until the mixture is lumpy. Keep stirring, incorporating all of the ingredients, scraping the bottom of the pan so that they don’t stick to it.

Step 3. After the mixture forms a ball, set it aside to cool on waxed paper dusted with flour.

Step 4. Gradually add about ½ cup flour, kneading the dough until it is the consistency of Play-Doh.

The next important thing is to make the Insulating Dough

Step 1. Combine 1 cup flour, ½ cup sugar, and 3 tablespoons vegetable oil in a medium bowl and stir with a spatula.

Step 2. Add food coloring of choice to ½ cup distilled water.

Step 3. Stir 1 tablespoon of the liquid at a time into the flour—sugar mixture and combine. Gradually alternate adding the remaining water and kneading in about ¼ cup flour until the texture is like Play-Doh.

And the last thing is to create the Circuit and Add Power and Lights

Step 1. Roll two pieces of conductive dough and one piece of insulating dough into short cylinders like little hot dogs. Smush together the three pieces, with the insulating dough in the middle. Make sure that the pieces of conductive dough are not touching each other.

Step 2. Clip one end of each electrical lead to the positive and negative battery terminals, and connect the other ends to the pieces of conductive dough.

Step 2. Insert the shorter of the two prongs of an LED into the conductive dough attached to the negative terminal, and the longer prong into the positively charged dough. You have just completed the circuit, and the light should be glowing!


Source: Popular Mechanics