With just an Arduino UNO R4 and a few lines of code, you can make that happen—no expensive GSM module required. To make Arduino send a text message to your phone without using a GSM module, you don’t ...

Connect the GND and VCC pin of this module to the GND and VCC of Arduino Uno. Let's connect the SPI pins ... Wireless Controlled Shutter Button for DSLR using Arduino and nRF24L01 Control your DSLR ...

This is a simple and practical implementation of an RFID-based attendance system using Arduino. It uses the MFRC522 RFID module to detect and read RFID cards. When a valid card is tapped, the system ...

One of the more interesting applications of this circuit would be to replace or to realize a smart sensor with Arduino. The 4…20 mA standard was introduced a few decades ago, to replace the existing 3 ...

frontend/ index.html # Main web page style.css # Stylesheet main.js # WebSocket logic backend/ websocket_server.py # WebSocket to MQTT bridge mqtt_serial_bridge.py # MQTT to Serial (Arduino) bridge ...

these AC-powered relays may be susceptible to many voltage sags that do not affect other elements of a control system. Therefore, they present an “Achilles heel” that may cause an entire machine, ...