Relay Module Schematic

Relay Modules A power relay module is an electrical switch that is operated by an electromagnet. The electromagnet is activated by a separate low-power signal from a micro controller. When activated, the electromagnet pulls to either open or close an electrical circuit.

How do I make a relay module?

We can magnetize the coil which will move the armature. Next we need to connect a diode across the

How does a 4 channel relay module work?

The 4 Channel Relay Module is a convenient board which can be used to control high voltage, high current load such as motor, solenoid valves, lamps and AC load. It is designed to interface with microcontroller such as Arduino, PIC and etc. The relays terminal (COM, NO and NC) is being brought out with screw terminal.

What is the difference between relay and relay module?

Firstly, we need to distinguish between relay and relay modules. A relay module is an array of one or more relays. While it is possible to purchase individual relays separate from the module, we recommend that you purchase them in a module format.

Why do we need relay module?

The relay module is an electrically operated switch that can be turned on or off deciding to let current flow through or not. They are designed to be controlled with low voltages like 3.3V like the ESP32, ESP8266, etc, or 5V like your Arduino.

What are the 4 parts of a relay?

A simple electromagnetic relay consists of a coil of wire wrapped around a soft iron core (a solenoid), an iron yoke which provides a low reluctance path for magnetic flux, a movable iron armature, and one or more sets of contacts (there are two contacts in the relay pictured).

How do you make a 12V relay module?

DIY Relay Module Making

1. Step 1: 12V Relay. Buying Link.
2. Step 2: PCB Board. I have used Dot PCB Board. ...
3. Step 3: Any PNP Transistor. Use any PNP Transistor Which Can Handle 20mA At least. ...
4. Step 4: PC817 Opto-Coupler. ...
5. Step 5: Resistor. ...
6. Step 6: PCB Mount Screw Terminal Block. ...
7. Step 7: Push Switch. ...
8. Step 8: Indicator LED.

What are the 3 terminals on a relay?

Terminal Descriptions

• -COIL- This the is the COIL terminal. These are the terminals where you apply voltage to in order to give power to the coils (which then will close the switch).
• -NO- This is Normally Open switch. ...
• -NC- This is the Normally Closed Switch. ...
• -COM- This is the common terminal of the relay.

What are the 5 pins on a relay?

5 Pin Relay 5 pin relays provide 2 pins (85 & 86) to control the coil and 3 pins (30, 87 & 87A) which switch power between two circuits. They have both normally open and normally closed connection pins. When the coil is activated, power will be switched from the normally closed pin to the normally open pin.

How do you wire a 4 channel relay module?

A 4-channel relay module has simpler wiring. ... Pinout

1. IN1 this pin receives the control signal from Arduino to control relay 1 on the module.
2. IN2 this pin receives the control signal from Arduino to control relay 2 on the module.
3. IN3 this pin receives the control signal from Arduino to control relay 3 on the module.

How do you wire a 4 channel relay?

The 4 channel relay module has three high voltage terminals (NC, C, and NO) which connect to the device you want to control. The other side has three low voltage pins (Ground, Vcc, and Signal) which connect to the Arduino. Inside the relay is a 120-240V switch that's connected to an electromagnet.

What is the output of relay module?

Output Relay Modules are used to interface computer logic levels to other voltage levels. They provide output from logic level control systems to external loads such as motors, valves, and solenoids. Solid-state modules deliver electrically clean, photo-isolated, noise-free interfaces.

How many types of relay modules are there?

Depending on the operating principle and structural features, relays are categorized into different types mainly: Electromechanical Relay. Solid State Relay. Reed Relay.

Can a relay work without a circuit breaker?

A Relay only provides signals to the circuit breaker in case of fault conditions while circuit breaker act as automatic circuit making or breaking device based on the information provided by relay signals. Relay only sense the error and inform the circuit breaker i.e. it won't break the contacts.

What are the pins in relay module?

Relay module consists of six pins such as normally open pin , normally closed, common , signal, Vcc and ground pins. Signal Pin : It is used to control the relay. This pin can be active low or active high. In case of active low, the relay will activate when we apply an active low signal to the signal pin.

How do you test a relay module?

How to test a relay

1. Keep the multimeter in the continuity check mode.
2. Check for continuity between the N/C contacts and pole.
3. Check for discontinuity between N/O contacts and the pole.
4. Now energise the relay using the rated voltage.
5. Now check for continuity between N/O contacts and pole.

How do you control a relay module?

Controlling a relay module with the Arduino is as simple as controlling an output – you just need to send HIGH or LOW signals using an Arduino digital pin. With the relay module you can control almost any AC electronics appliances (not just lamps).

Is relay module is a sensor?

The Relay Module is a dual, plug-in mechanical relay assembly for use in all Unison/Sensor3 Series Racks. Each Relay Module provides two electrically held relays, in the same form factor as standard dimmer modules.

What are the 2 basic types of relays?

Types of Relays - A Thomas Buying Guide

• Relays are electrically operated switches.
• Electromechanical relays have an electromagnetic coil and a mechanical movable contact. ...
• Solid-state relays are solid-state electronic components that do not have any moving components, which increases their long-term reliability.

What is A1 and A2 in relay?

A1 and A2 on a contactor typically refer to either end of the electromagnetic coil assembly. Most contactor manufacturers use A1 and A2 to designate the two terminals connecting electrical power to the contactor's magnetic coil.