Table of Contents
Is it possible to control AC bulb with microcontroller and relay?
Yes, it is possible but it is very complex for beginners. Normally a 230 V induction motor (AC) runs in a single direction. If you want to change the direction then you have to change the configuration of the primary secondary coil and capacitor. For controlling this configuration you can use relays.
How do you drive a relay with a microcontroller?
A relay can be easily interfaced with microcontroller using a transistor as shown below. Transistor is wired as a switch which carries the current required for operation of the relay. When the pin RB7 of the PIC microcontroller goes high, the transistor BC547 turns On and current flows through the relay.
What is a relay Why is it needed in any microcontroller circuit?
Relays are devices which allow low power circuits to switch a relatively high Current/Voltage ON/OFF. For a relay to operate a suitable pull-in & holding current should be passed through its coil.
What is light activated relay?
This light sensitive circuit can operate a relay to switch on lamps or any AC loads when it senses darkness. It is ideal to use as switch less night lamps driver. LDR is used as the light sensor. Its resistance is low about 100 ohms in bright light but increases to 10 meg or more in dark. Relay then switch on the load.
What is AC control relay?
The AC compressor relay is responsible for supplying power to the AC compressor and clutch. The AC compressor relay is no different then other electrical relays – its electrical contacts will eventually wear or burn out, and the relay must be replaced.
What is the role of relay to connect AC appliances with microcontrollers?
Relay is a mechanical device to control high voltage, high current appliances ‘ON’ or ‘OFF’ from lower voltage levels. Relay provides isolation between two voltage levels and it is generally use to control AC appliances.
What is a relay circuit?
Relays are switches that open and close circuits electromechanically or electronically. Relays control one electrical circuit by opening and closing contacts in another circuit. In addition, relays are also widely used to switch starting coils, heating elements, pilot lights and audible alarms.
What is light operated switch?
Light Operated Switch is a very commonly used circuit to control outside lighting or used for driveways and garage entrances. It is very simple and inexpensive design, which uses timer IC555 (IC1) and Light Dependent Resistor or LDR as a sensor.
How does a light activated circuit work?
Light Activated Switch is a simple electrical project circuit by which we can switch on and off the electrical load appliances like lights, fans, coolers, air conditioners, street lights, etc., automatically based on the day-light intensity instead of manually operating the switches.