Up next in How to Do Fun Tech & Science Projects (52 videos)
School science fair coming up? Don't worry: We've got step-by-step instructions to dozens of science projects in this Howcast video series, including how to build an erupting volcano, how to make glow-in-the-dark art, how to make a weather barometer, how to make disappearing ink, how to make 3-D glasses, and how to make a marshmallow gun.
You Will Need
- Battery Operated Alarm Clock
- Motorized Water Gun
- 16 Gauge Wire
- Wire Stripper
- Voltage Relay Switch
- Breadboard Circuit
- Soldering Equipment
Open the clock
Open the alarm clock and snip the 2 wires that lead from its circuit board to the speaker.
Strip the two ends of wire leading from the board, and splice two longer pieces of wire to the ends.
Solder these splices to secure the connection.
Snip watergun wires
Take apart the water gun and snip the two wires leading to the trigger switch.
Strip the ends of these wires, splice longer wires to each end, and secure the connections with solder.
Pop the relay switch into the breadboard circuit and connect each pair of wires to opposite sides of the relay.
Now set the alarm, position the water gun so it’s pointing at your face, and drop off into a nice peaceful sleep.