ESP8266 Wireless Toilet Usage Indicator (Smart Home)

Recently, we have recruited a number of new workmates, so there have something embarrassing happened, sometimes when I went to the toilet and found that both of the two toilets are occupied, once I complain to kevin about it, then he said: If there is a kind of indicator LED like an airplane toilet lights, so we could know whether the toilet be used. Good idea! I praised him: hey! Boy! You are really a genius! OK, now we have prepared everything, let think about that if you want to achieve remote control, what we need to do? The first role is the most popular platform board -ESP8266, as it happens, we have get some ESP8266 IOT Board just recently, it can achieve wireless control easily, and the most important thing is it cheap enough.”