You have a raspberry pi connected to all the sensors and a code running to trigger if the sensors are triggered. Each sensor and keypad would run to a different input on the pi. They should al be able to be powered with a single cell lipo. Is that what you are asking?
Answer:
Explanation:
The following code is written in Java. I created both versions of the program that was described in the question. The outputs can be seen in the attached images below. Both versions are attached as txt files below as well.
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Uni code is short for universal code , it was created so that all countries could communicate together without the need for special encoding for each country
Answer: No, because all you need is WiFi for both devices and a messaging app to do it for free like iMessage.
Explanation: Please correct me if I am wrong! :)