My dad is suffering from sleepwalking. To prevent him from unintentional collision with other objects and falling in the night times, i need a an effective ckt which can do the following:
a) shall detect his motion (say, whenever he crosses the bed room door frame). The bed room surrondings is reasonably dark. The bedroom doorframe is 4 feet wide.
b) shall sound an alarm ( buzzer) for about 10 to 15 seconds (to alert me)and goes off automatically.
c) the circuit shall reset automatically for the next detection.
My thanks in advance, if someone could provide me a suitable circuit with LDR based or IR based or whatever it is.
regards,
yagtoby