# where to connect pressure sensor to the bed?

Discussion in 'Sensors and Actuators' started by charmcaster.engg, Mar 21, 2014.

1. ### charmcaster.engg

79
1
Mar 20, 2014
where to connect pressure sensor(in the form of load cell to sense the weight of a person for detection of sleeping activity) to the bed?

2. ### donkey

1,286
56
Feb 26, 2011
ok this is one of those questions that will need a lot more explaining.
how big is the sensor? did it come with instructions? does it show a picture of best position? have you tried their website?
this sounds like a premade item. we can have a guess or 3 but seriously the best bet is to contact the person who made it and they will tell you best place.

3. ### jpanhalt

426
4
Nov 12, 2013
Do you want to determine whether the person or persons are sleeping or just in bed doing other activities?

John

4. ### charmcaster.engg

79
1
Mar 20, 2014
The load cell of 20kg or 100kg

The load cell of 20kg or 100kg is to be connected to the bed to sense the weight to determine sleeping activity only. There is only one person in his home. If he/she is sleeping for more time(sensor is inactive) he/she will not be well. At what position the sensor to be connected to the bed?

5. ### charmcaster.engg

79
1
Mar 20, 2014
person living alone,only sleeping activity

There is only one person(elderly) in his/her home. Only sleeping activity is to be determine so that if the person sleeps for more time(can be determine if sensor is inactive for long time) he/she is not well.

6. ### shumifan50

548
56
Jan 16, 2014
Depending on the size of the bed, the person in the bed could be in one of many different positions, so positioning it on the mattress could miss the presence of somebody. The only place that has to register all weight changes on the bed are the legs. So the best place for the pressure sensor would be between the leg and the floor. The previous is if a pressure sensor is to be used.
The alternative is to use a simple pull switch, as used over openings in burglar alarm systems. Several of these can be positioned across the length of the bed and connected in series, so if weight is applied anywhere along the length of the bed, one of the switches will be triggered. These switches can also be adjusted for sensitivity. To avoid causing discomfort the actual pull cord can be replaced with ribbon. If the base under the mattress is one of those interconnected spring versions, then the pull switch could be connected to a strategic position on the base, or a microswitch could be used to detect pressure on the base.

79
1
Mar 20, 2014
Thank you!

Thank you!