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9

I would either go with RS485 or CAN because with long buses a lot of noise can be picked up. These are the most noise resistant as both of them use differential, twisted data lines. RS485 supports distances up to ~1,200 meters with a guaranteed speed of 100 Kb/s. Max 10 Mb/s with smaller distances. It is a multi point bus with up to 32 drivers and 32 ...


2

Assuming you can drive this via MIDI as @jcaron suggests to get it to do what you want, you are still going to have to write a lot of code here. Some key points Booking/Locking, you are going to need a way to divide up time on the device since only one student will be able to use it at once You will need to map all the interface options between the web page ...


1

Yes, you could find something that can trigger on the voltage. But you'll have to power that too. Consider this alternate solution (maybe easier). Get a vibration sensor, such as the Samsung SmartThings multipurpose sensor. Set it up to monitor for vibration. Just attach it physically to the doorbell enclosure. One thing I'm not sure of is whether there's ...


1

You can use a nodemcu with an external trigger circuit to develop your solution. Connect a relay or an electronic trigger circuit to generate trigger signal for the NODEMCU. So when the door bell rings, it sets a high trigger to the NodeMCU and this trigger can be used to send a signal to the MQTT topic. A mobile app can subscribe to this MQTT topic to show ...


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