📄️ AT24C256 EEPROM
The infamous cheap AT24C256 I2C EEPROM board provides 32K bytes of storage for your projects:
📄️ DS18B20 Temperature
DS18B20 DS18B20
📄️ SI7021, HTU21, SHT21, HDC1080 Humidity & Temperature
SI7021, HTU21, SHT21 and HDC1080 are nearly identical I2C temperature (-10 to 85C) and humidity (0-80%) sensors.
📄️ TSL2561 LUX
TSL2561
📄️ W25Q64 FLASH
A cheap W25Q64 SPI flash board that adds 8 megabytes of storage to your project: