Materials List:
Designing a Thermostat
https://www.teachengineering.org/activities/view/cub_housing_lesson02_activity1
Each group needs:
- 1 breadboard (EXP 350 recommended, from online vendors; or RadioShack; or find used breadboards)
- 1(or more) LM35 temperature sensor chip (online from www.digikey.com; get extras in case students accidentally break one by setting up the circuit incorrectly.)
- 1 LM324AN operational amplifier integrated circuit (at RadioShack)
- 1 9-volt battery with battery connectors (or have a few for the class to share)
- 1 9-volt battery holder (optional, or have a few for the class to share)
- Ice
- Ziploc bag
- Thermostat Worksheet
- Breadboard and Circuit Diagram Basics Handout
For the entire class to share:
- 1 jumper wire kit (preferred since it is easier and reduces set-up time, at RadioShack), or each group needs 2 pieces of 1-inch wire, 2 pieces of 3-inch wire, and 5 pieces of 2-inch wire and electrical tape
- Small wire strippers (only needed if you are using insulated wire and not the jumper wire kit, to remove insulation at wire ends)
- Multiple ΒΌ watt resistors of various sizes from 500 Ohm up to 10K Ohm (100-piece kit and 500 piece kit at RadioShack)
- A few multimeters to make various measurements (such as Kelvin 50LE http://www.kelvin.com/ part # 990177)
Materials note: The breadboards, wires, wire strippers, resistors and multimeters can be re-used.