A pair of Semaphores linked via WiFi/Internet can be used to signal each other. Pressing the button on one will cause the LED to blink and send a message to the other unit to blink its LEDs. Either one can turn off the LED with another button press.
A static (reserved) IP address is required along with a TCP port forward . If the Internet is used, a Dynamic DNS may be required.
Top: Push Button Switch
Bottom: Attached De-bounce Capacitor
June 2021
