What did you build today (Pictures) ?

[berkseo]

The other day I received PCB of a long-awaited project. Yesterday and today, I soldered the device, designed and printed the case of the device. It works, wow!!!

[NeverDie]

I'm surprised no one here has built anything Covid19 related--even something as basic as a handwashing timer or something like that. I, for one, am tired of singing songs to time myself, and getting kids to handwash for the full recommended duration is, well, something I'd rather let automation enforce instead of me! ;-)

[berkseo]

@NeverDie From these things, which are in the photo above, can make an informant COVID-19. Show the trend, the number of infected people to date in your location, and so on.

[Yveaux]

A MySensor'ed temperature controller for my utility cabinet, which runs too hot due to all the electronics in there (cable modem, router, switch, etc.)
In its current version it is able to control a 12V 120mm PWM fan, and reads the temperature from 3 DS18B20 temp sensors (inlet, 'ambient' and router).
Later I might add a temperature controller to keep the ambient temperature stable at a a few degrees above inlet, by controlling the fan's dutycycle.

As all sensors in my utility cabinet are powered from 5V USB, I used a step-up converter to generate the 12V required by the fan.

After soldering everything together I wasn't happy with the orientation of the JST headers for the temp sensors, so a small PCB was added to mount them under 90 degrees:

All data and control is routed to Node-red, stored in InfluxDB and graphed in Grafana:

You can see the temperature of the router ('USG') go down with increasing fan rotational speed (lower chart, 'rpm.mean').
Temperature decrease is not as big as I hoped for, so I might need to install a fan with a bigger airflow.

[Danielo Rodríguez]

My new gateway with leds for state and the only node I have: A wireless arcade button controller

[mfalkvidd]

@Danielo-Rodríguez you might already be aware of this, but all that metal close to the nrf24 antenna will probably block some signal.

[Joerideman]

Well, it not really a build I plugged in wires, and copied code. Found a random usb charger and put it all in my workspace to be.

And I absolutely love this thing. Maximum of 3 hours work. I was having fun, so it could be more.

I considered that there could and should be a display on this thing, but not for now. I made this, because I have never experimented with temperature sensors and I just received a few. Now I can just see what happens with the temperature in there.
sensor is a AHT10 temperature and humidity.
http://www.aosong.com/m/en/products-40.html
I used this library: https://github.com/enjoyneering/AHT10
I repurposed Hek's DHT code, and swapped the readings with the AHT's

shed before

workspace after but still filling it.

[monte]

Today I've finally swapped my outdoor relay node with something descent.

This was my very first mysensors node that I've built when I was only starting to mess with arduino, probably around four years ago.

This board uses cheap 5v power supply and an amplified version of NRF24 module from Ebyte. It supposed to be poured with silicone ore resin, but I am yet to find suitable box, the size of this board appeared to be bigger then most of such cases designed for compound pouring. But I'm planning on making next version, with non-isolated power supply, which will help to achieve smaller size.

[berkseo]

My new project of a temperature and humidity sensor with an electronic ink display 1.02 Inch ( GDEW0102T4 ), very low power consumption, very small device.

https://youtu.be/2zTEHTAr7lk

[ncollins]

USB + ESP8266 adapter for W2812B LED strip.

Well, this is actually a Tasmota + Openhab build, but could easily be MySensors.

Also worth noting, this 5m 150 led strip draws too much current to reliably use with a USB wall adapter.

[mfalkvidd]

Very nice renderings.

W2812B uses about 50mA at full brightness, so you'd need a power supply that can deliver 7,500mA if you run the entire strip at maximum.

[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.