The AS3935 Franklin lightning sensor has the capability to detect electrical/lightning activity up to 40 km away, with distance estimation capability that tells the user as the lightning gets closer and closer. It can also sense two types of lightning: One is the cloud to ground and the second is the cloud to cloud. It is important to be able to detect both since typical storms may start with cloud to cloud lightning followed by cloud to ground type of strikes. Some of the existing lightning sensing equipment can only detect the cloud to ground type while the AS3935 Lightning Sensor can detect both.