I build and write but never advertise. I will try that for the first time.
Build your own Monitoring and Alarm system. The Android app Monitoring reads hard wired contact statuses and then transmits user defined alarm messages. The messages are sent by Gmail to your phone or tablet. The app requires Android M or higher, an OTC cable, and an external MIDI, ASCII, or development board. Search for "Monitoring and Znidarsic" to view the app at Amazon and Google. Project books are also available at "Znidarsic Science Books" at Amazon. Let me know how your system worked out on the amazon blog.
