Hello,

one of my big concerns with sensors is to have something good looking without my wife asking me what this ugly plastic box is. After failed searches for good looking and small enclosures, I decided to search for electronic items and only keep their boxes. I have tried with a tiny 333cm 2$ mp3 player and managed to fit a jmodule and sensors + cr2032 inside. But the plastic is still looking too cheap.
Then I discovered those great looking wireless chargers and bought 2 different models, they are pretty bad at charging but they look really good. Only problem: they are flat. No way to put a jmodule inside so I went for an EasyPCB and removed the plastic stripes on the headers to make the pcb as flat as possible. I choosed the smaller (but thicker) black one as in the other the PCB + NRF24 was already too thick (because of the crystal).
https://www.aliexpress.com/item/QI-Wireless-Charger-Charging-Pad-for-Samsung-Galaxy-S7-S6-edge-Note-5-Nokia-HTC-8X/32694769031.html
https://www.aliexpress.com/item/Factory-price-Qi-Wireless-Charger-Charging-Pad-for-LG-V10-Other-Qi-Phone-Mmar25/32639543557.html

To fit the pcb I had to remove the right part, and then cut the corners. Still, the antenna of the NRF 24 was too much so I had to cut it too I put a 10cm wire instead, soldered at the beginning of the cut pcb antenna and ... it works really well !
Unfortunately I couldn't fit a CR2032 after putting the PCB, so I decided to experiment with alkaline button cells, the more convenient solution was to take tiny ones (LR41/AG3) and put them between power connectors of the PCB.
I also added a bicolor led (green / red) aligned with the led window of the charger, it blinks at each sending loop, wether data is sent or not so I know it's still running. When battery level is high it blinks green, when it gets low it will blink red color so I know it's time to check if I have spare batteries. Also, voltage drop is smaller on red led so it's brighter, green led is dim even at full battery and would be invisible with low battery.

I use a SHT21 sensor and at the moment I send every minute (if values changed) the temperature, humidity, battery level (%) and battery voltage (to have history). With the led blinking that's a lot to bear for LR41 batteries (rated between 25-30 mAh) but it's done on purpose, to see how fast they get empty.

The PCB ended up pretty atrocious as I did many trials and errors with it (and kept long pins 11,12,13,RST to program the board and have to bend them to fit inside the box) but fortunately when I close the box everything is hidden and the sensor really looks good. With the led flashing it really feels like a commercial sensor you could buy in a shop. I put the sensor not too far from the usb plug hole, but there are also a opening all around the bottom of the enclosure, so I have no visible difference in measure temperature/humidity when I open or close the box.
Next step is a dedicated PCB to have a clean board and be able to fit bigger coin cell(s).

Wow I'm typing too much Here are the pictures...

Everyone is busy reading your NRF5 thread @NeverDie

Today I (finally) finished a full working version of that old Livolo 3 buttons switch. I removed the RGB led on the central button as it's not visible, but the basic switch functionality with buttons/relays and blue/red status leds runs fine.
It's running with MYSBootloader, it's really convenient to update without having to switch of the fuse and unmount everything.

A (quick) video, touch sensibility is perfect now, I'm really happy with it !
MySensored Livolo 3 buttons Switch - v3 – 00:11
— Nicolas Cambier

I have to agree with @skywatch and a few others here, MySensors is relatively easy to start with using the documentation, you wire your pro mini & radio for gateway and sensor and you're running your first sensor in no time.
But as soon as you want to make things a bit more advanced, you face a lot of challenges that the doc on the website and suggested components make harder to solve :

• PA/LNA radio that fail, need wrapping in foil to have decent performance etc etc I'm pretty sure this is the most frequent cause of failure for MySensors network.
• examples with DHT sensors that are not convenient for battery usage => use of step up converters that create a whole set of new problems and unreliability
• PIR example with SR501 that runs at 5V so you need to alter them to run at lower voltage (3.3V) that's still not so convenient and they become unstable (triggered by radio tx/rx)

I'll make a list of suggestions to improve the docs, it will probably include writing a few more examples also, and some tutorials for a few things that are easy in fact easy to do but can seem hard from the outside like flashing bootloader on a pro mini or OTA update.

Currently I have restarted to test my NModule "shields", I will improve and/or fix them and probably convert the most useful ones to MySX Connector.

Working on clearing up the backlog of unfinished NModule shields, today I finished to test the dual touch button shield, made a script to use it as on/off button or as dual button with short press = on and long press = off, as seen below as a dual scene controller.
Scene controller with NModule dual touch button – 00:23
— Nicolas Cambier

I made a box so it can be easily customized depending on what you use it for. Unfortunately internet is too bad at the moment in Vietnam to use Fusion 360 so I made it with 123D Design which is less convenient and it's not really high-end assembly

Not related to MySensors but I also assembled a first version of a battery powered led light, it's small and cheap and I will assemble a bunch to put around my home when there are some power cuts in evening/night. I'm using 3020 leds and they emit a lot of light for their small size, even with low current so I expect to get around 2 hours of battery life with the cheap aliexpress 16340 batteries, and way more than needed with the 18650 cells salvaged from my old laptop battery.
My first board with a li-ion charger and it is working well, now I'm waiting for the battery protection ics (cheap DW01 from AliExpress) to arrive as my batteries are not protected.

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

The nice thing about owning a 3D printer is that I don't have to buy enclosures any more. I just have to buy rolls of plastic. The sky is the limit when you have a 3D printer. I do like that enclosure though.

Can't agree more, made a quick box for the lights with "crystal" PLA. You need a lot of imagination to believe it's crystal, but it's nice for a light enclosure as it acts as diffuser.

Today, a 5uA always on display with a PCF8553 LCD driver and a GDC1038 LCD from GoodDisplay. Power consumption varies with voltage but mostly with what segments are on/off, but at 3.3V with segments on to display data on all parts of display (2*4 digit numbers and 3 letters) it's always below 6uA.

Not sure why the Youtube video won't integrate as it should, but here it is for a more animated version:
Arduino ultra low power LCD (5uA) – 00:21
— NicolasVietnam

Today I finished to fix failed soldering (too old solder paste made a mess ) on the "motherboard" of my air quality sensor.
It's based on ESP32, uses a charging IC with power path so it can run on batteries for around a day or stay plugged without destroying the battery, step down from USB/battery to get VCC, storage on I2C EEPROM, flash and/or µSD card (depending on use case), one SK6812 mini RGB led as indicator, a small 240*240 IPS LCD (backlight driven directly by ESP32 pin in high drive capability mode), a 3 way switch for basic user interface + footprint for PAJ7620 gesture recognition module, accelerometer and I2C IO expander to manage the 3 way switch and interrupts from sensor modules.
Sensor modules will be added on top, connected using an FPC connector. At the moment I made only one sensor PCB able to manage usual PM, CO2 and formaldehyde sensors. Only one sensor per sensor board where an attiny841 manages the UART sensor and convert it to I2C, it also manages the 5V step up to power the sensor.
On the main board I also added an NRF24 footprint so with the same PCB I will be able to make a gateway with integrated battery backup.

I'm pretty happy with the relatively well aligned components (no, I don't have OCD ) , too bad I had to unsolder, clean and re-solder each component as it now looks botched up. But at least everything (except a missing connection on µSD card, hence the blue wire) is working,

LCD test showing jpgs from SD card

@EddyG said:

Any news on the new board? I am really interested.

I'm testing a first version right now
It's running fine but there are some annoying defaults.
I'm making improvements to the PCB now and I will publish on openhardware.io in the coming weeks.

I'm using SMD NRF 24 with antenna outside for better reception. Radio capacitor is SMD also but big size (1206) so easy to solder.

This is what the assembled board will look like, it takes a bit more surface than jModule but as you can see it's really flat, around 7mm and less than 6mm if you remove the big reset button on the pro mini.

@Mr_sensor said in Easy/Newbie PCB for MySensors:

Can I have the pcb in the first shed also working as an extender, so the second pcb will be able to send out topics to the gateway as well? What to add to my code to achieve that?

Hello,
you must program it to be a repeater. Of course it will need to have radio on all the time, so it cannot be battery-powered.
https://www.mysensors.org/download/sensor_api_20#create-repeating-nodes

@tbowmo said in Coronavirus (way, way, off topic):

I don't know if any of you have seen this before:

https://gisanddata.maps.arcgis.com/apps/opsdashboard/index.html#/bda7594740fd40299423467b48e9ecf6

Yes it's famous, I used to watch it daily when there was mainly a big red dot over China, and a few tiny dots elsewhere. Now they had to reduce the size of dots, and it's red everywhere
I find the table here https://www.worldometers.info/coronavirus/ easier to see the trends, as the main info to know the progress of the epidemic in a place is the number of new cases / total cases and you can see it right away without clicking on each country.

@Sebex said in Next generation dust sensor for MySensors:

@NeverDie could you share your Honeywell code, I have trouble getting it to work. An example will help me a lot t learn from!

I made a library for that, I'm updating it to autodetect some various PM, CO2, Formaldehyde UART sensors but I'll find the old version for Honeywell only tomorrow if you want. If I forget, harass me by MP

@Jon-Raymond said in Anyone cleaning the flux off using an ultrasonic cleaner?:

@NeverDie Here in Canada we can buy 99% ISA from our local pharmacy for a couple bucks a bottle so that's why I normally go that route. Question, have you tried the actually flux cleaner like this before?

Haha off-topic but the French translations on this can look like they've been outsourced in China. Smells like Google Translate !

@giangired said in Coronavirus (way, way, off topic):

but our doctors start to say that the last days people around 50 years old are now increasing in the intensive care units

And yesterday a 16 y.o. girl died in France...

Edit: no pre-existing condition known and no saturation of hospital/missing equipment involved...
http://www.leparisien.fr/essonne-91/morsang-sur-orge-91390/julie-16-ans-decedee-du-coronavirus-personne-n-est-invincible-se-desole-sa-soeur-27-03-2020-8288850.php

@NeverDie this is some kind of NRF24L01 to UART converter.
It has no integrated radio, you have to plug an nrf24l01 in the connector.

@NeverDie said in Coronavirus (way, way, off topic):

the United States has tested approximately 313,000 people for the coronavirus

A lot of tests return negative while people are still in incubation period, but also after symptoms, they seems to be far from 100% reliable. Yesterday they stated that a case currently treated at hospital was tested negative 3 times already, but she is still not considered "cured" in the official statistics.
My building is still in quarantine, we were supposed to be released from quarantine if all direct contacts tested negative. They tested them all, twice, all negative, but they still maintain the quarantine until the end of the 14 days, and tested all the building yesterday.
I think it shows how much they trust the tests...

If you look at the study from Pr Raoult in France who claims chloroquine is an incredible cure, you can see the same patient can be positive one day, negative the next, and positive again on third day. And that's probably the best hospital in France, with the best equipment and very experienced doctors.

@zboblamont said in Coronavirus (way, way, off topic):

Not sure what US media is like, but in the UK it is expert and eminent virologists such as Pierce Morgan, Nigel Farage and Boris Johnson's father they select to interview....

I believe this is some kind of worldwide trend

@NeverDie for point 2) it's not comparable to someone coughing, nebulizer makes really tiny droplet that can stay in suspension, when you cough/spit the droplets are much bigger and don't stay airborne for long. But still, I think wearing tissue or even paper masks can limit the spread by blocking the saliva droplets.

For 3) it happened in Vietnam, a flight attendant was tested negative 4 times before testing positive. Some people have a long incubation period and it seems during part of this incubation period the test fails to detect the virus

For the FDA unfortunately at some point they have to give recommendations to people, as raw scientific data "It might, it might not" is not enough for people&companies to take a decision. So they have to opt for the most probable situation, and take into account the price and feasibility of things too I guess. If transmission rate is possible but likely extremely low with food, it's not worth spending huge amounts of money to avoid the few cases that it will cause.

@skywatch you're missing the point of the mask. Here it's not worn to protect you, but to protect others if you are infected. So you don't need to have an efficient/medical one, a cloth mask is enough to block saliva spray if you cough or just when you speak. I everyone is wearing a mask, you don't need glasses because no one can project the virus in your face.

@NeverDie most people starting to put food aside in February here, because with China next door people were afraid it would spread. It's the case for us we had plenty of food in stock and my wife was outside when the quarantine was enabled so she boughts fruits and other fresh food.
But we can also get deliveries at the entrance of the building and guards will give us so we are not in direct contact with delivery people.