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Chapter 16

Relays and power switching

5 min read8 sections
In this chapter · 8 sections
  1. Which switch to use
  2. Relay modules
  3. Solid-state relays (SSRs)
  4. Switching DC loads with a MOSFET
  5. Switching with a BJT
  6. The flyback diode
  7. Common actuators you will switch
  8. Mains safety rules

3 or 5 V, but your loads may need amps at 12 V or 230 V. Switching devices bridge that gap: transistors and MOSFETs for DC loads, relays and SSRs for AC appliances.

A GPIO pin supplies only a few milliamps at 3.3 or 5 V, but your loads may need amps at 12 V or 230 V. Switching devices bridge that gap: transistors and MOSFETs for DC loads, relays and SSRs for AC appliances.

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