ELECTRONICS
AT89S52 4-Relay Board with Optotriac Drivers
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CASE ANALYSIS
Scenario
Design a relay control board using AT89S52 microcontroller and optotriac drivers to switch AC loads.
Key decisions
- Use of solid-state relays (SSR) based on MOC3021 for galvanic isolation
- Inclusion of crystal oscillator and reset circuit for reliable MCU operation
- Choice of 220V AC mains and separate DC supply for the microcontroller
When to reuse this
When creating an isolated AC load switching circuit controlled by an 8051-family microcontroller.
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circuit-at89s52-4-relay-board-with-optotriac-drivers-for-ac-loads