How to make a water bottle LED flasher!

Step 4: Soldering the LEDs

For this step you will need the water bottle with the LEDs in it and the soldering iron. First start with the row that is the farthest away from the opening. Take all of the LEDs out except that row. Then solder wires onto the different leads of the LEDs. Use red for positive and black for negative. In case you don't know, the longer lead on the LED should get the positive electricity. After you have finished the first row do the next one, until all of the LEDs have two wires connected to them.