PC817

PC817 is a 4 Pin optocoupler, consists of an Infrared Emitting Diode (IRED) & photo transistor, which enables it optically connected but electrically insulated. PC817 is also known as an optocoupler / optoisolator. It consists of Infrared Emitting Diode (IRED). This IRED is coupled to a photo transistor optically and not electrically. It is closed in a four (4) pin package. This package is usually available in two different forms. The first one is wide lead (Pb) spacing option and the second one is SMT gullwing lead form option.

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MQTT ESP8266 Home Automation Project 2021

“How to make MQTT ESP8266 NodeMCU Home Automation project to control relays from the switch and smartphone (Circuit + Code) through internet. In this IoT project, I have shown how to make an MQTT ESP8266 Home Automation project to control a …

12V Uninterruptible Power Supply

“A simple and fully automatic, 12V uninterruptible power supply system for small/medium power appliances. Motivation This is a simple and fully automatic, 12V uninterruptible power supply system for small/medium power appliances. This power supply specifically designs to drive …

Smart Home With Multiple NodeMCU ESP8266 Network With Blynk

“In this IoT project, I have shown how to make IoT-based Smart Home Automation using Multiple NodeMCU ESP8266 network to control all the home appliances from the pushbuttons & Blynk App. If the internet is not available, then you can control …

Smart altenative switch with ESP8266, ioBroker and MQTT

“We can make the lighting switches in our house smarter with this ESP8266 circuit, so if no WiFi it will continue to work as a normal switch. We can make the lighting switches in our house smarter with this ESP8266 …

Smart Home Automation Using Blynk & ESP32 IoT Projects | WiFi & Manual

“In this IoT project, I have shown how to make IoT based Smart Home Automation Using Blynk & ESP32 to control an 8-channel relay module from the manual switch & smartphone using the Blynk App. If the internet is not available, then …

ESP32 Smart Home System With Alexa App & Manual Switches

“In this IoT project, I have shown how to make IoT based Smart Home Automation Using Amazon Alexa & ESP32 to control 8 home appliances from the manual switch & Amazon Alexa App. If the internet is not available, then you can …

Raspberry Pi CPU Temperature Indicator

“Previously I had introduced simple raspberry pi (Hereinafter as RPI) operational status indicator circuit. This time, Ill explain some more useful indicator circuit for RPI running as headless (without monitor) manner. The circuit above shows CPU temperature into 4 different …

Raspberry Pi Shutdown Indicator

“It’s very simple circuit for showing operational status of raspberry pi (Hereinafter as RPI). Maybe it’s useful when you running RPI as headless (without monitor). Sometimes I’m concerned when is right time for completely power-off after shutdown …

Home Automation Using Arduino and WiFi Module ESP01 | Arduino ESP8266 Control Relay

“In this IoT project, I have shown how to make IoT based Home Automation using Arduino and WiFi module ESP01 to control relays from the manual switch, smartphone, IR remote. This smart relay also can sense the room temperature and …

UltraSonic Liquid Level Controller

“A Simple ultrasonic liquid level controller based on STM32 microcontroller Introduction As you probably know, Iran has dry weather, and there is a lack of water in my country. Sometimes, especially in the summer, it can be seen that the …