The Omron MY2N is a general-purpose electromagnetic relay with a Double Pole Double Throw (DPDT) configuration. It is designed to switch high currents and voltages while maintaining a compact and reliable form factor. This relay is widely used in automation, industrial control systems, and general-purpose switching applications. Its high durability and dependable performance make it a popular choice for engineers and hobbyists alike.
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This circuit uses a WeMos D1 R2 microcontroller to control a 5V 2-relay module, which in turn controls the power to an AC bulb and a cellphone charger. The microcontroller also interfaces with a line tracking sensor, which likely provides input to control the relay states. The AC bulb and cellphone charger are powered by an AC wire connection, with the relay acting as a switch for the bulb.
This circuit is designed to control an AC LED bulb using a 220V power source, with an infrared motion sensor and an MMWave radar sensor providing input signals. The two-channel relay is used to switch the LED bulb on and off based on the sensor inputs, while the ESP8266 microcontroller is likely programmed to process the sensor data and control the relay. A converter is included to interface between the sensors, microcontroller, and the relay, ensuring proper voltage levels.
This circuit is designed to monitor environmental conditions and control peripheral devices. It features light and temperature/humidity sensing, visual output on an OLED display, and actuation of a fan, water pumps, and a stepper motor. Power management and distribution are facilitated by splicing connectors, and the system is controlled by an Arduino UNO, which currently has placeholder code for customization.
This circuit controls two DC motors using a combination of relays, a toggle switch, and capacitive sensors. The XL4015 DC Buck Step-down module provides regulated power, while the capacitive sensors and toggle switch are used to control the relays, which in turn manage the operation of the motors.
Below are the key technical details of the Omron MY2N relay:
Parameter
Value
Coil Voltage
6V, 12V, 24V, 48V, 110V, 220V DC/AC
Contact Configuration
DPDT (Double Pole Double Throw)
Contact Rating
5A at 250VAC / 30VDC
Coil Resistance
Varies by coil voltage (e.g., 160Ω for 24V DC)
Operating Time
Approx. 20 ms
Release Time
Approx. 20 ms
Insulation Resistance
100 MΩ minimum at 500VDC
Dielectric Strength
2000VAC between coil and contacts
Mechanical Durability
50 million operations
Electrical Durability
500,000 operations (at rated load)
Ambient Operating Temperature
-55°C to 70°C
Dimensions
28 x 21.5 x 36 mm
Pin Configuration and Descriptions
The Omron MY2N relay has 8 pins, which are configured as follows:
Pin Number
Description
1
Coil Terminal 1
2
Coil Terminal 2
3
Common Terminal for Pole 1 (COM1)
4
Normally Open Contact for Pole 1 (NO1)
5
Normally Closed Contact for Pole 1 (NC1)
6
Common Terminal for Pole 2 (COM2)
7
Normally Open Contact for Pole 2 (NO2)
8
Normally Closed Contact for Pole 2 (NC2)
Usage Instructions
How to Use the Omron MY2N in a Circuit
Power the Coil: Connect the relay's coil terminals (pins 1 and 2) to a DC or AC voltage source that matches the relay's rated coil voltage. Ensure the power supply can provide sufficient current to energize the coil.
Connect the Load:
For Pole 1: Connect the load to the common terminal (pin 3) and either the normally open (pin 4) or normally closed (pin 5) contact, depending on the desired switching behavior.
For Pole 2: Similarly, connect the load to the common terminal (pin 6) and either the normally open (pin 7) or normally closed (pin 8) contact.
Switching Behavior: When the coil is energized, the normally open (NO) contacts close, and the normally closed (NC) contacts open. When the coil is de-energized, the contacts return to their default state.
Important Considerations
Flyback Diode: When using the relay with a DC coil, always connect a flyback diode across the coil terminals to protect the driving circuit from voltage spikes caused by the collapsing magnetic field.
Driving the Relay: Use a transistor or MOSFET to drive the relay if the control signal cannot provide sufficient current. A base resistor is required when using a BJT transistor.
Isolation: Ensure proper electrical isolation between the control circuit and the load circuit to prevent damage to sensitive components.
Contact Ratings: Do not exceed the relay's contact ratings to avoid overheating or damage.
Example: Connecting the Omron MY2N to an Arduino UNO
Below is an example of how to control the Omron MY2N relay using an Arduino UNO:
Circuit Diagram
Connect pin 1 of the relay coil to the collector of an NPN transistor (e.g., 2N2222).
Connect pin 2 of the relay coil to the Arduino's GND.
Place a flyback diode (e.g., 1N4007) across the coil terminals, with the cathode connected to pin 1.
Connect the emitter of the transistor to GND.
Connect the base of the transistor to an Arduino digital pin (e.g., pin 7) through a 1kΩ resistor.
Connect the load to the relay's common and normally open contacts.
Arduino Code
// Define the relay control pin
const int relayPin = 7;
void setup() {
pinMode(relayPin, OUTPUT); // Set the relay pin as an output
digitalWrite(relayPin, LOW); // Ensure the relay is off at startup
}
void loop() {
digitalWrite(relayPin, HIGH); // Turn the relay on
delay(1000); // Keep the relay on for 1 second
digitalWrite(relayPin, LOW); // Turn the relay off
delay(1000); // Keep the relay off for 1 second
}
Troubleshooting and FAQs
Common Issues
Relay Not Switching:
Cause: Insufficient voltage or current to the coil.
Solution: Verify the power supply voltage and current match the relay's specifications.
Chattering or Unstable Operation:
Cause: Noise or insufficient drive current.
Solution: Use a decoupling capacitor near the relay coil and ensure the driving circuit provides adequate current.
Contacts Not Conducting Properly:
Cause: Contacts may be worn or damaged.
Solution: Check the contact surfaces and replace the relay if necessary.
Arduino Not Controlling the Relay:
Cause: Incorrect wiring or missing flyback diode.
Solution: Double-check the wiring and ensure a flyback diode is installed.
FAQs
Q: Can the Omron MY2N relay handle AC loads?
A: Yes, the relay can handle AC loads up to 250VAC, provided the current does not exceed 5A.
Q: Is the relay suitable for high-frequency switching?
A: No, the Omron MY2N is not designed for high-frequency switching. It is best suited for low to moderate switching frequencies.
Q: Can I use the relay without a transistor driver?
A: Only if the control signal can provide sufficient current to energize the coil. Otherwise, a transistor or MOSFET driver is recommended.
Q: What is the purpose of the flyback diode?
A: The flyback diode protects the driving circuit from voltage spikes generated when the relay coil is de-energized.
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