Weight sensor node

[Sefi Ninio]

Hi!

Say I want to create a node that turns everything off when I fall asleep.
One option would be to use a heart rate / pulse sensor and when it goes below a certain amount, run the turn off action - but that will require me to wear the sensor.
Another (less accurate option) would be to know when I lay down on the bed, and after a certain predefined time - run the turn off action.

Another scenario is that I want to know when there's new mail in the mailbox.

For this - I need a weight sensor node that can sense the weight change of the mattress or that there's new mail on the sensor in the mailbox.

I can't, however, find such a sensor. All I can find is a pressure sensor which seems to be barometric + temperature sensor...

Anyone knows of a weight sensor I can use for this node?

Thanks!

[Yveaux]

@Sefi-Ninio Try searching for Force-Sensitive Resistor: https://learn.adafruit.com/force-sensitive-resistor-fsr

[Sefi Ninio]

@Yveaux Perfect, thanks!

[bjacobse]

Put this underneath your mattress. It's a pressure sensor, add Mysensors door/window sketch, add timer to your homecontroller and switch off after timer runs out

http://www.ebay.com/itm/MICRO-TECH-82715-MATTRESS-BED-SENSOR-PRESSURE-ALARM-MONITOR-PAD-BLUE-26-X4-NEW-/201617825462?hash=item2ef15bdeb6mL8g8rjR_2rTw0murBem5iA

[Sefi Ninio]

Will that work as a weight sensor?
Couldn't understand from the description nor could I find the data sheet...

http://www.ebay.com/itm/new-hx711-load-cell-weight-pressure-sensor-module-for-arduino-uno-mega2560/131778364781?hash=item1eae9a456d

[hek]

Think you have to use it in combination with a sensor block like this.

http://www.ebay.com/itm/10KG-Scale-Load-Cell-Weight-Weighing-Sensor-HX711-Weighing-Sensors-AD-Module-/281925026200?hash=item41a40a8198:g:rm8AAOSwnLdWsCQX

[Sefi Ninio]

Hi @hek ,

thanks for your answer. Unfortunately, this will not work for this application...

[dbemowsk]

@Sefi-Ninio I was checking out MySensors videos on youtube one day and I stumbled on this one.
Cheap Bed Occupancy Sensor using Arduino & MySensors
I think this concept is exactly what you are looking for. I have thought about building this one myself.

[Sefi Ninio]

This looks great! Thanks a lot @dbemowsk !