Magnetic Door Window Contact Reed Switch Arduino

A magnet and reed switch mounted on a bicycle can help calculate the speed of the bicycle based on the rpm of the wheels.

Magnetic door window contact reed switch arduino.

To interface reed switch with arduino we need to build a voltage divider circuit as shown in the figure below. The other half is a magnet. Connect the negative pin the shorter pin of the led to pin gnd ground of the arduino. Based on the presence or absence of a magnetic field the reed switch contacts will be either close or open.

Since the switch is non polar you can plug in the wires any way. The switch that we are going to use has two parts. Only 3 left in stock order soon. The following image shows a simple reed switch with its internal connections.

Normally the reed is open no connection between the two wires. 7939wg wh ademco surface mount contacts white 4 4 out of 5 stars 183. Connect the positive pin the longer lead of the led to pin 13 of the arduino. The switch itself that usually comes opened and the magnet.

Reed switches can also be useful for other applications. When the magnet is less than. A magnetic contact switch is basically a reed switch encased in a plastic shell so that you can easily apply them in a door a window or a drawer to detect if the door is open or closed. In this tutorial we will use one magnetic contact door sw sensor and a buzzer for making a noise when a door is opened.

Today we will make a simple device that will light up a led when a window is opened and if it is opened for 15 minutes it turns on a buzzer to remind you to close it. We are using a normally open reed switch in this project. Vo is 5v when the switch is open and 0v when the switch is closed. How to use a magnetic door switch sensor with arduino.

This shows you how to connect and window door security sensor to an arduino. Magnetic door sensor reed switch. It also show how to add a third state wire cut using two resistors. Switch is closed in the presence of magnetic field and it is open in the absence of magnetic field.

Depending on the construction of the reed switch the contacts inside the switch can be either normally open or normally closed. 3 sets mc 38 mount wired door window sensor magnetic reed switch recessed alarm security.