This is the component we are missing: Hall effect sensor.
Our research question is “How does magnetism change with distance?”
The topic in important because it reveals the relation between magnetism and distance, and it’s an interesting topic to study.
We did research on where to get the components and how the final effect of this experiment will look like. We haven’t collect any datas yet, in fact we are missing a crucial component that would cost a lot on Amazon, it’s the only way to get it. We did assembled every thing on a breadboard and made sure everything is functioning.
We plan to do multiple test and get the average statistic. Here is the list of components we are using:
- Breadboard
- 9 V battery
- 9 V battery snap connector
- LM7805 voltage regulator
- A1302 Hall effect sensor
- Jumper wires (assorted)
- Alligator clip leads (2)
- Multimeter
- Magnets (2)
The procedure:
*Set up the experiment area using the materials stated previously to build the gaussmeter circuit,
Make sure that the multimeter displays 2.50 Volts when no magnets are nearby, move the magnet towards the hall effect sensor to test magnetic field (when a magnet is brought nearby the voltage should fluctuate, if the mutimeter shoots up to 5 volts use a smaller magnet,
Prepare a data table to record distance and voltage,
make sure the sensor is not near any magnets. Record the voltage displayed on the multimeter in your lab notebook and label it as “V0“.
Now, starting with the magnet touching the face of the sensor (a distance of zero), record the voltage displayed on the multimeter.
Slide the magnet directly away from the sensor (make sure you move it straight backwards, not to the side). Record the new distance and voltage in your data table.
Repeat step 6 until the voltage stops changing.
Repeat steps 5–7 at least two more times, for a total of at least three trials.
Calculate an average voltage for each distance.
Now, convert voltage to magnetic field strength. You can do this using information from the sensor’s datasheet, which says that the sensor has a sensitivity of 1.3 mV/G (note that the sensitivity is given in millivolts (mV) and you took your readings in volts (V), so you will need to convert from V to mV). You can convert voltage to field strength using the following equation:
Equation 1:
B=V0−V1.3
- B is the magnetic field strength in gauss (G).
- V0 is the voltage when there is no magnet nearby in millivolts (mV).
- V is the voltage recorded at a certain distance in millivolts (mV).
- 1.3 is the sensor’s sensitivity in millivolts per gauss (mV/G).
Make a graph of magnetic field strength versus distance.
We connected with Mrs. Casey.