I have a project for school and could use some advice on where to start -
I must build or develop device that will operate for exactly 14 sec after being started. At the end of 14 sec, the device must either turn on a small light bulb or ring a bell. After the initial run, I will have to change the time interval by plus or minus 3 seconds.
What's allowed:
homemade electrical devices
stored potential energy in form of springs, rubber bands
gravitational potential energy
batteries for lighting bulb or ringing bell
windup toys not initially designed for specific time intervals
pendulums of our own design
What's not allowed:
commercial electronic timing devices
commercial clocks
any 110volt operated devices
any device that will not sit on top of tables
no chemical reactions
any device that has no circuitry used to light bulb/ring bell
I have no problem creating a circuit to light a light bulb, but wondering on how to achieve time delay without timing device. Thoughts???
Thank you!
I must build or develop device that will operate for exactly 14 sec after being started. At the end of 14 sec, the device must either turn on a small light bulb or ring a bell. After the initial run, I will have to change the time interval by plus or minus 3 seconds.
What's allowed:
homemade electrical devices
stored potential energy in form of springs, rubber bands
gravitational potential energy
batteries for lighting bulb or ringing bell
windup toys not initially designed for specific time intervals
pendulums of our own design
What's not allowed:
commercial electronic timing devices
commercial clocks
any 110volt operated devices
any device that will not sit on top of tables
no chemical reactions
any device that has no circuitry used to light bulb/ring bell
I have no problem creating a circuit to light a light bulb, but wondering on how to achieve time delay without timing device. Thoughts???
Thank you!