Review on π MakerFocus Raspberry Pi Expansion Board: 4-Channel Relay Module for Raspberry Pi 4B/3B+/3B/2B - No Programming or Programmable Options by John Ruelas
NC (normally closed) and NO (normally open) names swapped
All 4 relays have 3 connection points: NC (normally closed) COM (common) NO (normally open) Test with multimeter for der Continuity test shows the NC and NO marks are *REVERSED*. The pin labeled "NC" is actually normally open. to understand for a while why your stuff isn't working; in the worst case, you can damage sensitive equipment or suffer injury/electric shock.
- Pleasant
- Difficult to remember but it was
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