Who hasn't experienced the problem of being in the garden or in the basement for a short while and then the mailman or parcel delivery person rings the doorbell. It would be helpful to receive an immediate message or email on your smartphone. But maybe you just want to integrate the doorbell into your smart home, so that a light flashes or a sound is emitted when the doorbell rings. Even if there is now even an official Homematic IP solution, we show today in a step by step tutorial, how to integrate your doorbell at the front door easily and inexpensively into the Smarthome and how to send emails with the Homematic CCU2. In another tutorial we will show you how to build a mobile Homematic door chime yourself.