4 relyčių modulis (4 relay module) HL-52S Generic (JD-Vcc jumper)

4 channel relay module is „Low Logical Level Triggerable“ (Low Trigger) with the „JD-Vcc jumper“ to suit different configurations of relay power and control signal levels.

Using the 3V3 Raspberry Pi (or 3V3 Arduino) as an example, The Songle relay switch power is from external 5V power source, Vcc is connect to Rpi’s 3V3 logic power, and IN is connected to an Rpi GPIO pin in output mode.

If signal at IN is Low (0V, Ground), then current flows (sinks) from Vcc to IN, optical coupler EL817C is activated, Songle switch is activated (energized), contact COM is connected to NO (Normal open).

If signal is High (~3V) then current sinking is too small to activate the optocoupler, therefore Songle switch is deenergized, and relay switched off.

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