Congratulations on this project, excellent idea.

I sometimes used a FaceTime call between an iPad and my phone as a make shift baby monitor. Audio only, I don’t think video is really necessary. In fact, our Angelcare monitor at home was audio only.

Ours also had sleep apnea detection (a mat to put below the mattress), perhaps the accelerometers could be used to detect lack of movement.

Thats great! I got the idea from a similar setup actually, I set this app up so you can connect and disconnect any time though so you dont have to walk into the room to accept the call.