I have a small problem and hope to finally find an answer in this forum. In fact:
I want it to work in the end so I have a Nodemcu esp8266 and connected to a rfid reader and a relai. The nodemcu is then connected to my local server and as soon as I hold a chip (rfid chip, card, other) to the rfid reader, it should query via php script on my MySQL database, if the value "Allow" at the appropriate chip id is set to 1 or 0 (the value Allow stands for whether or not the relay can be turned on). And depending on whether the value is 1 or 0, the relai goes on or off (1 = on, 0 = off). I want to fix it then so that the relai stays on for a certain time and then goes out by itself again. The value with the 1 and the 0 over which I just wrote should not describe the value of the relay but how often you can still make the Relai on. So for example:
0 = Relai does not work
1 = relay goes on (value = -1)
2 = relay goes on (value = -1)
In any case, I know myself well with php and MySQL, but not so with the arduino ide and the nodemcu and therefore appeal to all good technicians in this forum that can help me kindly. Also, my knowledge does not go that far because I'm only 13 years old. I am thankful for every help.
Thank you in advance