EDIT: I no longer recommed this method. I use this instead, FSR - the best bed sensor I’ve been trying a few things for a bed occupancy sensor. An MS5611 pressure sensor ‘sealed’ in a waterproof flexible phone case or in a silicone tube did not work. The air leaked out of both rather quickly. I’…

No. You would need an ESP32. The ESP8266 only has one ADC.

Would an analogue multiplexer work instead? Seemingly let’s you plug multiple analogue inputs into a single output. How it seems to work I am unsure. I will look at an esp32 as well. I have a few 8266 D1 mini boards so worst case I could make two sensors and power both D1 minis off a single 5V.

[image] aaronpk: I’ve noticed pretty drastic changes in the values that tend to shift seasonally Yeah the drift is mostly due to the dimensional instability you get with timer in a non constant temperature and humidity. I’ve implemented the same thing: [Screenshot_2020-11-10 Overview - Home…

[image] SpikeyGG: [image] tom_l: There’s a better option here though: Bed occupancy sensor, using parts you have I am totally trying this right now. OMG. Hey, people of this thread who are struggling with the bed sensor drift problem. You should definitely look at this aluminum foil/pa…

I’ve heard that sensor drifts too though. After trying load cells and pressure mats in many different configurations I think I’ve finally found a fast sensor that does not drift and has a large detection difference between occupied and not. I will be testing for a few more days then probably closin…

Speaking of sensors I recently upgraded to a couple of these and getting significantly more reliable results. https://uk.rs-online.com/web/p/door-sensors-window-sensors/9184756

Yeah pressure mats are good - for a while. I’ve found that the ones I’ve been using ( S5184A 760 x 530mm Pressure Mat Normally Open - Altronics ) eventually wear out. They’re constructed using two printed electrode patterns on plastic sheets separated by a sheet of perforated open cell foam. Assumi…

Could you please tag me if you open a topic about it? Really interested in this and was disappointed by the other systems so far.

Sure. I’ll also put a link to the new topic here when I close this topic, so you should see it now that you are tracking the topic.

Interestingly I’ve gone from very similar FSR strips to the mats. The FSR’s so far have worked the longest but recently they’ve started to drift a lot. So far the mats are working much better with no drift at all, that being said I’ve had to fold them in order for them to be sensitive enough. It wi…

Bed occupancy DIY sensor

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tom_l December 12, 2021, 12:41am 155

@Burningstone new project is up.