What did you build today (Pictures) ?

[ncollins]

@mfalkvidd Yeah, I realize I can only use a portion of the strip, or keep it very dim. I actually bought this with the hopes of flashing with Tuya Convert, but turns out they switched to non ESP modules. So, I figured I would make my own.

[ncollins]

A bed occupancy sensor. 4 50kg load cells, an HX711, and a Wemos D1 to make a wifi scale that rests on a bed slat under the boxspring.

Given the placement and weight distribution it doesn't turn the bed into a huge bath scale, but definitely accurate enough to use the deltas to estimate if there is someone in the bed. I can also tell when our 12lb (5.5kg) dog is on the bed.

I have rules in openhab to turn the overhead fan on and off. Also disables some TTS notifications if somebody is in bed.

[markjgabb]

thanks to assistance of some of the people here i now have up and running a front gate controller for my double front gates (Solar powered)

now have a node that monitors the batteries, knows if the gate is open or closed and has a relay for activating the gate

[ncollins]

Compact, simple NRF52 motion sensor
Ebyte E104-BT5032A NRF52832 module
MH-SR602 Motion Sensor
LiFePO4 AA Battery

[tssk]

MYS PoE MQTT Gateway with 868Mhz LoRa radio in IP55 85mm x 85mm box

• arduino pro mini 3.3V clone
• SX1276 with spring antenna
• W5500 lite
• 5V 802.3at power over ethernet splitter (gutted)
• SPELSBERG IP55 box

[berkseo]

My new arduino project wireless weather mini station with electronic ink display 2.9 inches (GDEH029A1), very low power consumption,compact size, housing with magnets. The device can use si7020 / 21, sht20 / 21, HTU20/21D or BME280 sensors. Use the MINEW MS50SFA RF module with nRF5210, nRF52811, nRF52832 chips, or the EBYTE E73 module with nRF52840 and nRF52833 chips. Soon to be available on openhardware.io

Video: DIY Mini Weather station with an electronic ink display 2.9 Inch ( GDEH029A1 )

[tssk]

Prototype of room sensor for stardard electric box

• arduino pro mini 3.3V
• sx1276 radio
• bme680
• 2x1.5V AA battery holder
• battery measuring circuit according to https://www.mysensors.org/build/battery
• ABB Tango cover (drilled)

Cover is not fully closed to allow air circulation. But I would preffer some method to drill holes/grill into it - any tips to get decent looking result?

[NeverDie]

@tssk said in What did you build today (Pictures) ?:

any tips to get decent looking result?

1. Drill at low RPM so you don't melt the plastic.
2. If you're going to drill a bunch of holes to make a kind of grill, then preferably use a CNC (even a cheap one!) to drill them so that they don't look hodgepodge.

[sundberg84]

@tssk - really like your design! Well done.

[mfalkvidd]

@sundberg84 thanks for creating this thread btw. You got the 1st and 1001st post :)

[sundberg84]

Today im testing and outdoor node in a new PCB, but I had mixed csk and ce on the radio (it's a dual radio PCB).

[NeverDie]

@ncollins Just wondering: why 4 load cells per sensor instead of only one?

[ncollins]

@NeverDie

• At 50kg per cell, 4 would allow me to actually turn the bed into a huge scale if I decided to go down that route
• I don't believe these are intended to support a significant load for extended periods of time, they can permanently deflect. Given they always have the weight of a king size mattress + boxspring, I wanted to distribute that as much as possible

[sundberg84]

Current issue: outdoor nodes random stops/disappears - maybe during the time when its high humidity, so trying to try some different approaches i read - this multisensor is getting painted with clear nail polish. Also this PCB is a new board im testing, that Im hoping to be the base for my "final" home automation nodes. Still in dev. but great possibilities!

[NeverDie]

@sundberg84 Gaskets that are held under tight compression seem to work well at holding out moisture. I've seen a number of commercial products that rely on that and only that for in-ground radio sensors.

[NeverDie]

Here's an example from the new Flume (version 2) water meter monitor:

It gets strapped to your water meter, typically in the ground. All it has is one gasket to seal out everything. This particular box just snaps closed. No screws! Quite a difference from Version 1, which also used a gasket, but had 12 screws holding it snug.

[tssk]

@sundberg84 Really like the shape and look of the PCB! I hope I can achieve similar result for my room sensor.

[berkseo]

And another of my completed projects is a mini weather station running on nRF52832 and nRF52840, you can install bme280 or si7021, htu21d. Powered by a single cr2450 battery. As always soon to be on openhardware.io

Video: https://youtu.be/HNjYtKyh8zo

[NeverDie]

@berkseo By calling it a mini weather station now you'll need to add an anemometer and rain gauge... :-)

[berkseo]

@NeverDie Sorry, I didn't know there were rules like that now :), then it would just be a temperature, humidity and pressure gauge with weather forecasting, okay?