KeyeStudio EASY PLUG RJ11 Single Relay Module - Isolated Switching Output for Arduino Control Projects The KeyeStudio EASY PLUG RJ11 Single Relay Module is a controller-friendly switching module for turning external loads on and off from a microcontroller. A relay lets a low-power GPIO signal control a separate circuit, making it useful for automation demos, smart-home prototypes, fans, lamps, pumps, and STEM control experiments. The RJ11 EASY PLUG format is designed for tidy cabling in KeyeStudio-compatible learning systems. It can be used alongside Arduino-compatible controllers such as the ELAB Nano V3, control panels based on the UNO R3 Prototype Expansion Board, and sensing modules such as the HS-S05A Sound Microphone Sensor. Relays can switch higher voltages than logic circuits, so wiring must be handled carefully. Keep mains wiring isolated, use proper enclosures, and test first with low-voltage loads if you are building an educational project. Technical Specifications Parameter Value SKU KY-KS0127 Brand KeyeStudio Product Type EASY PLUG RJ11 single relay module Output Device Electromechanical relay Control Interface RJ11 EASY PLUG signal connector Contact Terminals Common, normally open, normally closed on typical relay modules Use Case GPIO-controlled load switching Host Platform Arduino and compatible KeyeStudio systems Isolation Relay contact isolation between control and load circuits Safety Note Use proper enclosure and ratings for higher-voltage loads Board Layout & Label Guide RJ11 Port - EASY PLUG connector for controller-side signal wiring. Relay - Mechanical switch that controls the external load circuit. COM - Common relay contact. NO - Normally open contact, closes when relay activates. NC - Normally closed contact, opens when relay activates. Indicator LED - Shows relay input or active state on many relay modules. Mounting Holes - Secure the module before connecting load wiring. Safety Gap - Keep load wiring separated from logic wiring. Application Scenarios 1. Arduino Relay Blink Switch the relay on and off every second for a low-voltage load test. const int relayPin = 7; void setup() { pinMode(relayPin, OUTPUT); } void loop() { digitalWrite(relayPin, HIGH); delay(1000); digitalWrite(relayPin, LOW); delay(1000); } 2. Sensor-Controlled Fan Turn on a relay when a sensor value exceeds a threshold. const int sensorPin = A0; const int relayPin = 7; void setup() { pinMode(relayPin, OUTPUT); } void loop() { int value = analogRead(sensorPin); digitalWrite(relayPin, value > 600 ? HIGH : LOW); delay(200); } 3. Timed Pump Output Run a pump relay for a short fixed duration. const int relayPin = 7; void setup() { pinMode(relayPin, OUTPUT); } void loop() { digitalWrite(relayPin, HIGH); delay(5000); digitalWrite(relayPin, LOW); delay(60000); } Packing List 1 x KeyeStudio EASY PLUG RJ11 Single Relay Module FAQ Q: What does this module do?A: It lets a microcontroller switch an external load through a relay. Q: What is RJ11 used for?A: The RJ11 connector is for EASY PLUG controller wiring. Q: What are NO and NC?A: NO closes when activated; NC opens when activated. Q: Can I switch mains voltage?A: Only if you understand the relay rating and use proper safety practices and enclosures. Q: Does it isolate the load?A: Relay contacts provide electrical separation between control and load circuits. Q: Why does the relay click?A: That is the mechanical contact switching. Q: Can I use PWM?A: No, relays are for slow on/off switching, not PWM speed control. Q: What should I test first?A: Use a low-voltage load to confirm logic polarity and wiring.
