What did you build today (Pictures) ?

[berkseo]

@NeverDie sgp40 sensor is used, I also test the bme680, but the results are worse there.

[berkseo]

@berkseo

[hlehoux]

My first RFM69 Battery sensor: an ultrasonic sonar to measure the level of my fuel tank (don't laugh, winters can be cold in Burgundy :-) )

Many thanks to @sundberg84 and @mfalkvidd for advice to the Newbie i am and to @Gerator for the RFM69 gateway

[mfalkvidd]

Nice work @hlehoux!

Electronics and fuel sounds like a scary combination to me 😨

[hlehoux]

@mfalkvidd You're right: For production i'm going to build isolation for the sensor not to be in contact

Anyway: The flash point of domestic fuel oil is 55 ° C, which means that fuel oil cannot ignite below this temperature. In addition, in its liquid form, fuel oil is non-flammable at room temperature.

[KooLru]

• Temperature and humidity sensor AHT-10
• NRF52823 module
• Power board CR2477
  Connected via MYSX connectors
  Firmware based on NodeManager library

[franz-unix]

Hi guys,

my last creation: the d-diot hub v.3.0

The hub A (wood) is a dual MySensors gateway (RFM69 and NRF24) based on two ESP8266 modules and a BLE gateway + RGB controller thanks to an ESP32 module and ESPHome firmware.

The hub B (grey and red) is an IR gateway and RC 433 Mhz gateway based on ESP32 modules with an ESPHome firmware. The hub B has also an integrated step-up and step-down voltage regulator based on Arduino Nano.

To allow the maximum flexibility in placement inside the house, each module can be build as a stand-alone piece of hardware or combined in a single device (see pictures).

The hub is meant to be used with Home Assistant, the case is 3d printable and as usual, if someone is interested, there is a dedicated wiki page with all the details and the build instructions.

[KooLru]

I2S/IIC to MYSX converter

Configurable via jumper matrix

[sundberg84]

@KooLru - very clever sollution for the lines.

[nagelc]

@berkseo
Hey. Our own berkseo is on Hackaday. Congrats!

https://hackaday.com/2021/03/11/nrf52-weather-station-gives-forecast-with-style/

[berkseo]

@nagelc
Wow, this is unexpected.

[nagelc]

I made a simple board to use as a CR2032 battery simulator. It is actually two identical pcb's back to back. I added pins for applying power and another set for measuring current. Now I need a better ammeter. The uA scale works well when sleeping, but the mA scale doesn't seem to pick up the awake current.

[electrik]

@nagelc Nice!
What is the PCB you are measuring on? I'm actually looking for a NRF5 board to use with a coin cell.

[nagelc]

@electrik

It's actually at this link posted earlier in the thread: What did you build today (Pictures) ?:
I mostly use it with BME280 modules for temperature and humidity, but I have tried some other I2C modules in it.
I'm still experimenting with the motion detector. That will probably get it's own board at some point. It doesn't really fit the enclosure I designed this board for.

[berkseo]

I think this open source project is finished. This is a small air quality sensor. Quite a useful thing turned out for our not simple time.

https://github.com/smartboxchannel/EFEKTA-EINK213-AIR-QUALITY-SENSOR-NRF52840-V2-ED3

[KevinT]

Finished my Garage Door Node.
It has open/close magnetic reed switch sensors, a DS18B20 temperature sensor, a PIR motion sensor and a bjt to trigger the door to open/close/stop.

20210612_201851[1].jpg

[KevinT]

[nagelc]

@KevinT Very cool.
How does it respond to the PIR. Does it stop the door if it sees motion?

[KevinT]

Thanks.
The motion sensor is used to turn on the lights in the garage via a Sonoff mini.
Also, I've had the garage door randomly open by itself (power glitches?) a few times over the years. So I'm adding an automation to close the door if no motion is present and it is after midnight.

[fsgraz]

A collection of the sensors and actuators I buit for my camper in the past year

the power supply system under the dinette seat

the battery management system (purchased) data are read via wifi by an ESP32, which reports the info to the GW via nRF24L01+.

a closed look at 2 sensors.
the one on the left reads voltage and current from the solar PV panel and to the battery management system

the one on the right reads voltage and current from/to the start and service batteriers
both sensors report instant power and energy.

Fresh water sensor reads the water level, flow and temperature.
has 4 optcoupled outputs to send the information to the 4 LEDs of the original control panel of the camper

gray water tank sensor reports water level with an ultrasound sensor. has an optocoupled output to the "full" LED of the original control panel

bettry supplied temperature and humidity sensor.
I use it in the fridge but also at home, where I have also one with BME280.

A fan controller to help the fridge to work better, controlling the condenser temperature using an optical thermometer sensor.
I have 3 other units, one in the power supply system, one in the closet and one on the roof.
They are all with a PID controller.