This is a simple IOT example for the NodeMCU or ESP8266. You can control some LED diodes from NodeMCU through an user-friendly web server.
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WiFi SSID: ESP8266-IOT
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Gateway: 192.168.2.1
| NodeMCU | LED |
|---|---|
| D5 (GPIO14) | 1st anode |
| D6 (GPIO12) | 2nd anode |
| D7 (GPIO13) | 3rd anode |
| D8 (GPIO15) | 4th anode |
| GND | All cathodes |
Advice! You should add 330Ω resistors before every anode.