Hello. Thanks in advance for your reply.
I'm looking for the smallest and hopefully cheapest board that has wifi (it could be a base board with an addon as long as its not too expensive) and it needs to be able to to close a circuit/send voltage. (I dont know the exact voltage, yet)
I want it to interface with another legacy system which I why I need it to be able to send voltage/close a circuit. (This is how it will communicate, albeit simple and one-way) to the host system.