RC522 Reader/Writter RFID Tag Keyfob VLF RFID Clamshell Card/Tag Low frequency (125Khz) RFID Reader Serial Out EM 18 MODULE RFID Reader Module 125Khz HC-12 is a long-distance wireless transmission HM 10 Bluetooth module HC-06 Bluetooth Module- Breakout Board Bluetooth Transreceiver HC-05 XBEES2c XBeePRO S2C XBP24CZ7WIT-004 module SHARP GP2Y0A02YK0F 20cm to 150cm IR Range Sensor SHARP GP2Y0A21YK0F 10cm to 80cm IR Range Sensor LM35 Temperature Sensor XH- W1209 DC 12V -50 to 110 Temperature Control Switch DS18B20 PROBE TYPE DS18B20 PCB TYPE DHT11 - ultra low cost digital temperature and humidity sensor DHT22 capacitive humidity sensing digital temperature and humidity module Water flow sensor ½” NEXT