General Discussion

You can buy on LCSC also, I bought a bunch of components there together with PCB (at jlcpcb, same company), price is not as low as AliExpress (and some US components are even more expensive than legit sellers like Arrows) but they have a lot of things at "Chinese price" that you can get all at once. I found a few things like connectors, battery protection IC etc that are hard to find or expensive on Ali/Ebay.

Thanks. Unfortunately, none of those resources had the part identifiers for the parts that I have. So, lesson learned: I'll create my own ID catalog every time I buy a receive a new part. That way, if need be, I can identify it later.

@akya the number of times you can read a DHT11 in a given time period isn't limited. You can read as fast as you want. The limit widely mentioned (at various rates of around once every 2 seconds) has to do with the heating effect of turning on current to the temperature sensitive resistor to take a reading. Someone tested and noticed that reading at high speed caused a slightly elevated temperature reading. You can test for yourself and see at what read rate you notice an increase, or just limit to once every 2 seconds or less.

I'm using them, I got the ones from soshine and the stated capacity is just a little more than the one measured by the charger.

I'd check this out: https://forum.mysensors.org/topic/6528/mh-z19-co2-sensor/17

@รอเร-อ Then I suggest you please re-READ, and as I suggested, Google, as Abraham Lincoln once said, "Never believe absolutely everything you read on the Internet". The 5v is irrelevant other than the threshold voltage which registers as a HIGH to it's I2C control. The 3v3 as Master dictates the HIGH as a factor of it's VCC on the I2C bus. THAT is the issue. As Vcc is never absolutely accurate you may strike lucky on a 3v3, there again you might not, your choice... ;) EDIT - To avoid any confusion, what I am referring to here is conventional I2C system. The input HIGH for a 5v is say 0.7 of Vcc, so 3.5v is required on the 5v I2C line to register as a HIGH. Even if a 3.3v Arduino were to put full Vcc on the I2C line it is just below the threshold for the 5v device. That is where the factor I referred to comes in, and I read elsewhere it can be 0.6 but cannot recall which device that referred to. Hopefully that clarifies what I was referring to.

Thanks! I guess I'd love to see a big player create products that are open to tinkering.

Thank you for the idea. I try and I will do a report. But is there a way to start the sketch after a delay even if the gateway does not find the broker. I understand that this is not very interesting .... except for my library. With a node, it is possible to start the sketch after a delay with the parameter MY_TRANSPORT_WAIT_READY_MS. Thank you.

@mfalkvidd Unfortunately, the "Enable In-Topic Searching" feature is what generates the start of "in:topic-4803 soft_hmac_key" and nothing else. It does find the first occurrence but doesn't have a way to search after the first. I learned that I can just prefix "in:topic-####" to my search and then I don't have to make the forum grab the <ctrl> f key in my browser. @the person who edited the "Posts per Page" restriction of 20, a huge giant Thank You!! 100 posts per page is a great improvement over 20. I was about to request this but saw it was done when I went to get the exact wording. :-) This giant topic being 10 pages is bearable. (and probably doesn't use a ton of javascript which was blocking local caching so probably saves a ton of bandwidth for your servers...) P.S. my original problem is solved too, the forum is so useful!

@alexsh1 Much the same principal as my 5v/3v solution for the 5v ultrasonic, only here I used a latching relay leaving the 3v Arduino on sleep power consumption. An interesting device however, with a low standby and effectively a timer function, it has many possibilities. Where this original project has been skewed is unfortunate, the selected devices compel the dual voltage solution, whereas an alternative strategy removes the need for it completely. Although pulses and switches can be regarded as "old" technology, they can still be highly effective for battery powered applications where energy conservation is critical..

Nice! :) https://lowpowerlab.com/2018/07/07/new-products-m0-breakout-boards/

Hi @raulp, welcome to the MySensors community. I don't understand what you are trying to do, but the MySensors getting started guide is available from the rocket icon at the top of the forum (https://www.mysensors.org/about ) Developer contribution guidelines are available at https://www.mysensors.org/download/contributing Library documentation is available at https://www.mysensors.org/apidocs/index.html

@dbemowsk I used LP2950-5.0 in one node when feeding from 12v - about 3 months everything works quite stably.

Arduino IDE can only program chip, not read its program memory. But you can use AVRDUDE ( maybe with some GUI ) for reading program memory from your chip. And in your program sketch define some string to identify version. It can be read hex output of program memory then.

Trying it with the extra config command: --extra-cxxflags="-DMY_OTA_LOG_RECEIVER_FEATURE"

Great work @eric007, thanks for reporting back!

@eric007 I think I found by myself: using events to manage my installation.

Nevermind i fixed it! had something to do with my radio... Driving me nuts :-) #lovemysensors!! can close this topic when needed

@nca78 I start experiment this weekend and will give it a try. Thanks for the ideas to make a working solution, in this case the use of an existing IR controle.