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2.9 - Feel the Magnetism
The most common type of reed switch contains a pair of magnetizable, flexible, metal reeds whose end portions are separated by a small gap when the switch is open.
A magnetic field from an electromagnet or a permanent magnet will cause the reeds to attract each other, thus completing an electrical circuit. The spring force of the reeds causes them to separate, and open the circuit, when the magnetic field ceases.
A common example of a reed switch application is to detect the opening of a door or windows, for a security alarm.
Schematic
By default, GP14 is low; and will go high when the magnet is near the reed switch.
The purpose of the 10K resistor is to keep the GP14 at a steady low level when no magnet is near.
Wiring
Code
Note
You can open the file
2.9_feel_the_magnetism.ino
under the path ofeuler-kit/arduino/2.9_feel_the_magnetism
.Or copy this code into Arduino IDE.
Then select the Raspberry Pi Pico board and the correct port before clicking the Upload button.
When a magnet approaches, the circuit will be closed. Just like the button in the 2.5 - Reading Button Value chapter.