I’m interested in extending my smart irrigation project but have no idea how to integrate new sensors with bolt. Can I get any help regarding how to work with new sensors?
Check this thread Integrating sensors without need of other devices
Do let me know in case you need any other information.
Try to check what type of sensors you can find in budget + what sensors are going to be important and how they work. This is an interesting project, some day I would like to collaborate with you.