In simple words there is no physical connection between the coils contacts and the other relay contacts. The coil contacts are completely isolated from the Common contact, Normally Closed contact, and Normally Open contact. NC is the Normally Closed contact and NO is the Normally Open contact. On the right side we can see two contacts NC and NO. Among the three contacts on the left side, the middle one is the common contact, while the other two contacts are the coil contacts. This relay has a total of 5 pins or contacts, 3 contacts on one side and 2 contacts on the other side. The pins configuration of these types of relays are exactly the same, even if you are using a 5v Relay. This relay can also be used to control DC loads up to 28VDC with load current up to 10Amps. This voltage remains completely isolated from the voltage connected with the Common and normally closed or normally open contacts of the relay.Īt 250VAC it can handle AC load current up to 7Amps, 10A AC loads at 125VAC, and 12A AC loads at 120VAC. 12VDC means, that this relay can be controlled using 12Volts, this is the voltage used to energize the relay coil. Normally, I use these types of relays for controlling AC loads, for making H-Bridges, etc. This is the 12V SPDT “Single Pole and Double throw” type relay. You will also find the same relay in readymade relay modules. This type of the relay is the most commonly used one. For the best understanding I will make one Relay driver circuit which can be used to control all these relays. To control these relays automatically using an Arduino board or ESP8266, or ESP32, or any other controller board, you will need to make a Relay driver circuit. When you connect the voltage with the relay coil pins you will hear the click sound. The type of relays I am using can be operated using 12Vdc and 24Vdc. All you need is to connect the desired voltage with the relay coil contacts, which can be 5V to 48 Volts, and this is normally printed on the Relay. It really doesn’t matter which type of the electromechanical relay you are using, the working principle is exactly the same. These are four different types of Relays different in shapes, sizes, and pins configuration. Let’s start with the Electromechanical relays. You can make a good Relay control circuit only if you know about the basic working principle of the Relay. Anyway, we will cover both types of relays “Electromechanical and Solid-state”. You can make automation systems using Relays, you can make solar trackers, you can make Robots, and so on. I would appreciate your support in this way! What is a Relay?Ī relay is a switch (electro-mechanical or Solid State) used to control AC and DC loads or used as the input device for monitoring faults etc. I may make a commission if you buy the components through these links. Without any further delay, let’s get started!!! Because after reading this article you will be able to design and make any type of relay control circuit. So, if you are into learning the real engineering things, then this article is for you. In the end I will share links to these different projects. The main purpose of this article is to help you learn the designing calculations, so that you can design and make your own relay modules and then use it with Arduino Boards, ESP32, ESP8266, you can use it in the remote relay switch, radio frequency controlled circuit, wireless relay, Bluetooth Relay, you can use it as the Ethernet relay, Nodemcu relay, low voltage relay, remote relay, PLC relay, temperature relay, phase control relay, lighting relay, engine control relay, smart relay, RF relay switch, and so on. Don’t worry we will also cover the readymade relay module, as this is the ultimate Relay Control article. If you do so you will have no control over the designing, because that’s a readymade relay module. If your Aim is only to control a Relay, then you can simply purchase a readymade relay module connect it with the Arduino, write one or two lines of code and that’s it. Relays are my favorite and I have been using different types of relays for years. Relay Types “Electromechanical Relays”:Īrduino Relay Control Circuit Designing and Code- In this article, you will learn how to design and make your own Relay Control driver circuit which can be used with Arduino Uno, Arduino Nano, Arduino Mega, Arduino Pro Mini, ESP8266 D1 Mini, Nodemcu ESP8266, ESP32, and all the other types of controller boards and electronics circuits.
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