Arduino UNO SPE Shield adds Single Pair Ethernet (SPE) and RS485 to Arduino UNO and compatible boards, notably the Arduino UNO R4, via a Microchip LAN8651 SPE controller. Single Pair Ethernet relies ...

including Arduino Uno ($15), MFRC522 RFID module ($5), RTC module ($3), I2C LCD ($5), RFID cards ($2), and supporting components ($5). This is significantly cheaper than commercial solutions that cost ...

Arduino Real Time Alarm Clock DS3231 with TM1638 ... Uses RTC (Real Time Clock - DS3231) and NTP (Network Time Protocol) for maintaining time. OLED Display (128x64) for instant updates. A webserver ...

Place the SIM800L library folder into your \Documents\Arduino\libraries folder. You may need to create the libraries subfolder if its your first library. Restart the ...