Electronic To-Do List using Hall Effect Sensors
Hall effect sensors are non-mechanical switches that respond to the presence of an electrical field. Certain hall effect sensors are unipolar, meaning they will turn on in the presence of a magnet and will turn off when the magnetic field is removed. These also often only respond to one pole of a magnetic field. In this project, Karen uses this helpful characteristic of hall effect sensors to build an electronic To-Do List with chores that turn red when exposed to one side of a magnet, and green when exposed to the other side.
Supplemental Content:
Bill of Material:
| Product Name | Manufacturer | Quantity | Buy KitBuy Kit |
|---|---|---|---|
| KINGBRIGHT LED, Green, Through Hole, T-3 (10mm), 20 mA, 2.2 V, 568 nm | KINGBRIGHT | 6 | Buy NowBuy Now |
| LED, Red, Through Hole, T-3 (10mm), 20 mA, 2 V, 625 nm | KINGBRIGHT | 6 | Buy NowBuy Now |
| BATTERY HOLDER 4 X AA, 6V, w/ switch, wire leads | OSEPP | 1 | Buy NowBuy Now |
| AA Batteries | Pro Elec | 4 | Buy NowBuy Now |
| Hall Effect Sensor, Switch, 25 mA, SIP, 3 Pins, 3.8 V, 24 V | Allegro | 12 | Buy NowBuy Now |
| Through Hole Resistor, 220 ohm, 400 mW, ± 1% | Vishay | 12 | Buy NowBuy Now |
| Magnets, Button, Rare Earth, 18mm x 3mm, Pack of 3, D01768D01768 | Duratool | 4 | Buy NowBuy Now |
Additional Parts:
| Product Name |
|---|
| Steel Electrical Outlet Box with steel punchouts |
| Cup Hooks |
| 1/4" plywood |
| 1/8" plywood |
| 3/4" velcro |
| Picture Frame |
| Hot Glue Gun |