Hi! Can you please help me troubleshoot my Arduino Uno circuit? It interfaces with my alarm system and sends via WiFi the alarm messages to an MQTT broker. I use the relay to detect when the alarm fires by detecting the signal the alarm panel sends to the siren. The alarm has 12v logic so I use 10kohms voltage dividers to drop the voltage going to digital inputs 2 and 4. Everything worked fine for a few days but then the Arduino got fried. I haven’t been able to pinpoint the problem.
Any help would be greatly appreciated. Thanks