Switches & Relays
Toggle switches, tactile push buttons, DIP switches and Songle PCB relays. Panel controls for project boxes and the relays that let a 5V signal switch a real load.
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Choosing a switch
| Switch | Action | Rating | Use it for |
|---|---|---|---|
| MTS-202 / MTS-203 toggle | On-On or On-Off-On, DPDT | 6A 125V AC | Panel power, mode select, motor direction |
| 6x6x5mm tactile button | Momentary, normally open | 50mA 12V DC | Reset and menu buttons, keypads |
| DIP switch 4, 6, 8 position | Slide, set and forget | 25mA 24V DC | Addresses, configuration, microstepping |
Relays
The Songle SRD is the blue relay found on most Arduino relay boards. The 5V version has four pins and a single normally open contact. The 12V version has five pins with both normally open and normally closed contacts. Both switch up to 10A, but the coil draws more than a microcontroller pin can supply, so drive it through a transistor with a flyback diode.
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).
Switch and relay FAQs
What is the difference between On-On and On-Off-On?
An On-On switch (MTS-202) connects one of two circuits in each position. On-Off-On (MTS-203) adds a centre position where neither circuit is connected, which is handy for forward, stop and reverse on a motor.
Can I drive a Songle relay straight from an Arduino pin?
No. The 5V coil draws about 72mA, well over a pin's safe limit. Use an NPN transistor such as a BC547 or 2N3904 with a 1k base resistor, and a 1N4148 or 1N4007 diode across the coil.
Can these relays switch mains power?
They are rated for 10A at 250V AC, but mains wiring must only be done by a licensed electrician.