Sensors & Buzzers
Light, magnetic and infrared sensors plus active and passive buzzers. The parts that let a project see what is around it and make a noise about it.
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Choosing a sensor
| Sensor | Senses | Output | Typical project |
|---|---|---|---|
| GL5528 LDR | Light level | Resistance (use a divider) | Night lights, enclosure lighting |
| 5800B LDR | Dim light levels | Resistance (use a divider) | Dusk to dawn switches |
| SS49E Hall sensor | Magnetic field strength | Analogue voltage | Filament runout, position, joysticks |
| E18-D80NK IR sensor | Objects 3 to 80cm away | Digital (NPN, active low) | Robots, part detection, counters |
Active or passive buzzer?
An active buzzer has its own oscillator and sounds as soon as DC is applied, so it suits simple alarms from 3V to 24V. A passive piezo needs a square wave, which means your microcontroller sets the pitch with the Arduino tone() function, so it can play melodies and different alert tones.
Buying electronic parts from OzFDM
Every part is sold individually, so you can pick up two resistors or two hundred without buying a kit full of values you will never use. Orders ship from our Bibra Lake store in Perth, and orders over $299 ship free Australia-wide (excluding PO Boxes).
Sensor FAQs
How do I read an LDR with an Arduino?
Connect the LDR from 5V to an analogue pin and a 10k resistor from that pin to ground. The reading rises as light increases. Use a 47k to 100k resistor with the 5800B for better range in dim light.
Does the E18-D80NK work with a 3.3V board?
The sensor needs 5V power, but its output is open collector, so add a 10k pull-up to 3.3V and it is safe on an ESP32 or Pico pin.
What is the difference between a Hall sensor and a Hall switch?
The SS49E is linear: its output voltage rises and falls with field strength, so you can measure distance or angle. A Hall switch only reports on or off when a magnet passes a threshold.