The total cost for building this RFID attendance system using Arduino is approximately $25-35, including Arduino Uno ($15), MFRC522 RFID module ($5), RTC module ($3), I2C LCD ($5), RFID cards ($2), ...

You can create a release to package software, along with release notes and links to binary files, for other people to use. Learn more about releases in our docs.

An Arduino Uno (CH340G clone) reads temperature and humidity from a DHT11 sensor and computes 10+ environmental metrics (heat index, dew point, enthalpy, humidex, vapor pressures, etc.), outputting ...