lastchancename:
I've done something similar in the past with visible light phototransistors.
Variations in ambient light or reflections from the victim kept retriggering the sensor until the person left, fell asleep or died.
This sound really interesting! I will PM you about more information. Thanks.
Grumpy_Mike:
I suspect that the bright people of this forum would find your project distasteful.
I think those people should not be so quick to jump the gun there. The application of this project is in ergonomics, its for a master thesis, all participants are volunteers and we follow appropriate ethical practices.
LarryD:
... Using a SR04 and coding things to have at least one measurement near by (example 3 feet) within a period of time should work. ...
I will try this, I have limited time and resources for experimenting in the actual environment though. Thanks
6v6gt:
Have a look here for a similar request and some imaginative solutions:
At desk sensor? - Project Guidance - Arduino Forum
Yeah I read that but I didnt find any useful information.
How about this sensor: MLX90614 its i2c and it seems to be a similar sensor to whats being used in the Ben Heck TV Show. Does anyone have any hands on experience here?