What is a relay, its composition and classification description

The relay is an electronic control device, usually used in automatic control circuits, it is actually a kind of “automatic switch” that uses a small current to control a large current. Therefore, it plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit. There are many types of relays, such as […]

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How to Make a Smart Home Automation System Using ESP8266 and Relays

This article will introduce you to a home automation system that can easily control lights, fans, and other household appliances through voice commands using NodeMCU and Relay modules. In this IoT project, I made Alexa smart home automation system using NodeMCU ESP8266 and relay module. You can easily control lights, fans and other home appliances […]

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Speed ​​relay structure_speed relay braking circuit diagram

How Speed ​​Relays Work The speed relay relies on the speed as the signal to cooperate with the contactor to realize the reverse braking of the motor, also known as the reverse braking relay. The shaft of the speed relay is connected with the shaft of the motor. There is a cylindrical permanent magnet on […]

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Circuit diagram of electronic door lock safety key system

This is the circuit diagram of the electronic door lock security key system. This means that the safety system circuit is a combination of the keys themselves (not mechanical). The output can be connected to drive the relay to open the door (usually with a motor). This is a very simple electronic door lock circuit, […]

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Three types of magnetic hold relay drive circuits

relayprotectCircuit Direct action protectionCircuitAs shown in Figure a. The overcurrent release (tripping coil) yr in the manual operation mechanism of the circuit breaker is used as the direct acting overcurrentrelay, connected into two phases onerelayType or two-phase tworelayFormula. 2022-03-31 09:19:22two hundred and eighty-six , reducerelayCoil power consumptionCircuitchart relayThe power consumption of the coil can be […]

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Automatic control mode of refrigeration system

With the development of science and technology, the technical means of automatic control of refrigeration system, from relay control to single chip microcomputer control, PLC control, industrial control computer control, are constantly upgrading and improving. Let’s learn about these different control modes. Relay control: It adopts the way of hard wiring, and realizes the combined […]

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How to use esp8266 and relay to make smart home automation system

This article will introduce you to a home automation system, which can easily control lights, fans and other household appliances through voice commands using nodemcu and relay modules. In this Internet of things project, I used nodemcu esp8266 and relay module to make Alexa smart home automation system. You can easily control lights, fans and […]

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Analysis of the difference between PLC and DCS

PLC and DCS are the two core products of on-site industrial automation control. Up to now, they have mutual integration and intersection in selection and use, and each has its own advantages. PLC and DCS tend to have the following characteristics in terms of functions: 1. Data acquisition: various field signals convert various physical quantities, […]

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Discussion on the principle and action of AMR sensor

AMR magnetoresistive element The resistance of the magnetoresistive element changes in a magnetic field perpendicular to the current direction. After the AMR sensor is configured in the mode shown in the figure, the components with variable resistance (R1, R4) and the components without variable resistance (R2, R3) can be combined. Action of AMR sensor After […]

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