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Explore 14 ways reed switches are used in IoT and robotics, with SA-specific advice on sourcing, wiring, brands, and troubleshooting-brought to you by Communica.
Reed switches detect presence, position, speed, and serve as reliable triggers in IoT and robotics.
Find popular reed switch brands and kits in SA, with key selection tips for educational and industry use.
Easy integration, common connection diagrams, and troubleshooting specific to local operating environments.
Reed switches are simple yet highly effective magnetic sensors widely used as digital triggers in both IoT devices and robotic systems. Their non-contact operation, reliability, and resistance to environmental contaminants have cemented their role in applications such as position sensing, security, and control automation. For South African makers and engineers, reed switches offer a durable, cost-effective, and locally available solution perfectly suited to both prototyping and field projects.
A reed switch consists of two ferromagnetic blades sealed within a glass tube. When exposed to a magnetic field (from a permanent magnet or electromagnet), the blades either touch (normally open) or separate (normally closed), allowing the device to act as a basic digital on/off sensor. No power is required to operate the switch, and only a small current is needed to activate logic inputs, which makes them ideal for low-power and battery-based Internet of Things applications.
| Specification | Typical Value/Range | SA Context/Notes |
|---|---|---|
| Switch Type | NO (Normally Open), NC (Normally Closed), Changeover | NO most common in educational kits |
| Contact Rating | 10-100 W, 0.5-2A peak | Check against 220V/12V relay driver circuits |
| Sensitivity (AT) | 10-50 AT (Ampere-turns) | Impacts magnet distance needed |
| Response Time | ~0.5 ms | Sufficient for most mechanical triggers |
| Form Factor | Glass tube (various sizes), surface mount | Glass most common; check for rugged mounting |
Wiring a reed switch is typically straightforward. Below is a standard example for interfacing with a microcontroller (e.g., Arduino, Raspberry Pi, ESP32):
3.3V or 5V ----┃----o/ o---- GPIO Pin
|
10kΩ (pull-down resistor)
|
GND
The included pull-down resistor ensures the input pin reads LOW when the reed switch is open (no magnet present).
Suppose you're building a garage vehicle presence sensor in Cape Town using a standard glass type NO reed switch. If your relay coil draws 20mA at 12V, select a switch rated for at least 30V/0.5A. To activate at 2cm distance, a magnet rated to match the switch's 20AT sensitivity is required. Always test with the actual magnet and mounting for consistent operation.
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