Motion detectors MAria lira

Imagine if it was casual to track your dog, your food and even a small bee...

Scencors now come with incredibly small microchips that can capture electromagnetic waves and a receiver will respond to the transmission.

It all started with Alexander Graham Bell. He and the medical team assembled a device to find where a bullet lodged President James A Garfield.

All detectors come with major similar components

  • Shaft- centerpiece attachment
  • Stabilizer-makes comfortable to use and move around
  • Control box - unit with batteries, microprocessor,controls and speakers
  • Antenna- search coil, head or loop

Reader control and application software is a network connected device ,either fixed or mobile with antenna that sends signal power and commands to tags.RFID includes tag chips or integrated circuits (IC) with the ability to capture different signals. The IC or chip is placed on anantenna that has been printed or vapor deposited (sandwiched) and programmed onto a layer of more durable structure. This assures the signal will reflect off at a higher, more precise intensity.

New innovations allow us to scene incredibly tiny vibration frequency such as a smartwatch accelerometer.

Wrist detectors come with camera image classifiers. By preprocessing color and feature extraction the integrated device can resize and manipulate the image to locate the object or detect movement.These are used for security but technological advances allow to track objects or your distance jog by portable watch/phone.

Using a similar concept we can detect metals around our home using home-made sources. You can find your dog by receiving a signal (the magnetic field )generated by the electrical signal and the receiver/metal (collar).

CFL lamp
  • cfl lamp (inner components)
  • AM/FM radio
  • Coil,wire
  • Insulating tape/ electrical

Following the circuit guide we will connect the wires at according locations and assemble the circuit board. First we will add the battery to the cfl lamp. Then we will adjust firmly to the resistors.

Using an AM radio, tape and calculator we will make our own homemade detector.We will turn the AM radio to a high end (not broadcast station) until we hear static. Then, we will position them together and tape firmly. Using a metal ( tool, spoon,copper) we will approach the detector at various locations and check the change of voltage.

The AM radio will be set at approximately 14.4mV to 17.7mV. Our location distance will be set north of the antennas pointing location (without other objects as obstacles and equal level upward) and setting will be room temperature.We will set 6 different distances and record our results on a Voltage vs Time graph. We will repeat the trail 4 times. Our results will indicate if distance increases or decreases


"Discover Detecting." Discover Detecting. N.p., n.d. Web. 30 Mar. 2017.

"How RFID Works." HowStuffWorks. N.p., 05 Nov. 2007. Web. 30 Mar. 2017.

"Voltage Detection and Indication by Electric Field Measurement." N.p.n.d. Web. 30 Mar. 2017.

"Antenna Circuit Design for RFID Applications." N.p., n.d. Web. 30 Mar.2017.

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