Salt water & Bubbles switch

After the first introduction to basic electronic circuits, the assignment was to create a simple switch for a LED circuit.

Starting the assignment, I began with creating a basic switch circuit with a push-button.

IMG_7293  IMG_7294




As this was done, I started to research about different conductive materials. I was drinking some water, when I remember that when (iodized) salt is added to water, the ions break apart and make the salt+water mixture conductive. I thereafter looked throw many videos and examples of how to build a basic circuit using saltwater.

Some examples:

After research, I concluded a basic circuit needed to light up an LED with the use of saltwater.


From this, I created the circuit by using a 9V battery, Arduino, wires, LED, 330 ohm resistor and a cup of salt water. It was important to keep in mind that the wires in the water did not touch.







As I was trying to come up with an idea for how to use this circuit in a simple but a bit more interactive way, I was drinking some orange juice form a little plastic bottle and with a straw. That is when I realized that I could create a circuit that lights up an LED when bubbles are blown into the salt water. The straw was plastic, which means no electricity is led to my body, hopefully.

I gathered all the necessary parts for the circuit.

IMG_7343 (1)

And I assembled the parts. I used extra pieces of copper wire to create the circuit – the red and black long wires. Both of the ends went into the saltwater. The other end of the red long wire, was connected to the positive (+) leg of the LED and the black wire connected the 5V power and the saltwater. I taped both of the wires to the plastic bottle, making sure that these are not touching the water.





Going on, I had to adjust the water level to make sure that the bubbles will reach the wires






Here is the final result.