Since you need several temperatures, you will want an I2C expansion card, then one
of the grove-DS18B20 temperature sensors (look for it on amazon), and you’ll then need several of those
sensors without the resistor Vktech-DS18b20-Waterproof-Temperature-Transmitter
I was just going to make a green-house monitoring/watering/venting system… I did a previous project
with an ebb-flow hydroponic garden, so I already have my RV water pump, solar panel, solar-charge-conroller, battery,
float-switches, and solenoid valves, and relay-board. A couple of motors and I’d be in business.