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💬 mySensors Hit Train

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https://www.openhardware.io/view/747/mySensors-Hit-Train
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devDuino Sensor Node V2.2 (ATmega 328)
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New to electronics and progamming.... hence excuse rather dumb nature of my query .. recently purchase the Devduino V2.2 OTA version and am trying to figure out if the device comes pre loaded with the arduino bootloader. ??
💬 HVAC Recuperator control
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Hello all, I studied a little bit more this part of the circuit and it's a standard self oscillating flyback converter or a ringing choke converter as others call it. Indeed it provides the most compact solution for space constrained designs. But all of this comes at a cost: it's difficult to obtain a stable circuit and it has to be tuned by trial and error - at least this is what the literature says. I'm not a switching power supplies expert here(even though I want to learn more about SMPS's in general but my time is limited for now) but I've come to a conclusion: it's difficult to tune this or to change the existing circuit to accommodate the mysensors circuits power requirements. I tried various combinations using sleep schemes and to change the flyback converter components as other mentioned in the mysensors forum and indeed I can power up my custom design that is presented in this thread BUT it's NOT STABLE. From time to time the switching transistor(mje13003) burns out and this is because I removed the resistor placed at the input of this power supply - near the bridge rectifier and replaced it with a wire(this is not the same resistor as @Lukaspp replaced from the base of the transistor which is the startup resistor for the flyback converter). Now the only purpose that I imagine for this resistor is to suppress the transients - but it has a big value(100Kohm) which limits the current to a non-usable value for our purpose. I know that there are other solutions to overcome the transients but they are either bulky or too slow for this(correct me if I'm wrong here). More than that let's not forget that we have 2 power supplies here and when the lights go on the first supply(flyback) input gets shorted by the relays contact(I have the relays variant btw not the one with triac) so I'm thinking that other transients appear here as the primary inductor doesn't like that as far as I know - so I assume the above mentioned resistor of 100Kohm comes into play here too. Another role for it would be to limit the inrush currents. I played with that value too but it needs to be very low to have something stable and I got a value around 200ohms but that doesn't help as it's too low and after some time the resistor burned up and saved my transistor :simple_smile: . Now with all the tricks in the world and tuning the flyback converter to give more current this won't help as again let's not forget we have a SERIES circuit here so without external intervention we can't achieve that(only if we break somehow the laws of physics or maybe my thinking is limited :simple_smile: ). In this case the external capacitor placed across the light bulb comes into play to supply enough current to the standby circuit which is our flyback converter over here. I played with that one too and from 0,47uF I got to 4.7uF to have a decent result - but this one gets bulky and more expensive from obvious reasons. And let's not forget that the light bulb itself has some impact overall because this is the actual LOAD that we want to control and there are various light bulbs over there with various requirements. More than that they have their power supply embedded which in most of the cases is a(you guessed maybe): a self oscillating FLYBACK CONVERTER or similar. So this one too has inrush currents, transients which are sensed down the line to our dear Livolo switch and affects my custom board stability again :simple_smile: - isn't life beautiful? :simple_smile: So far these are the results of my trials and none of them proved to be stable so I kinda gave up on this and will try to use a normal powering scheme somehow(as Sonoff switches with a battery powered touch switch on the wall). Not the best solution of all but this is what you get when the infrastructure wasn't thought for this scenarios from the beginning. The Livolo guys thought of all of this I assume so that's why they stayed only with a simple circuit - a PIC mcu which maybe sleeps most of the time and a simple radio receiver which draws around 5mA or even less - so yeah that's why this works and it's stable in its original form.
💬 Wirsbo/uponor thermostat
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I am non technical but I have 8 wirsbo stats in my house. One of them is faulty and the unit is now obsolete. Is it possible to purchase one of these pcbs and use it to replace the one in the faulty stat ? Thanks Richard
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@Nca78 Do you tested this board, if yes, did it work? And which CS capacitors did you use?
💬 OH Mini-Multi-use Sensor Platform
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I am still using several temp/hum sensor and they are running great I also have just added code and pictures for my newly build light sensor (using an LDR).
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My Project • mysensors • • yoshi824

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@yoshi824 Most of us have been where you are now! I suggest that you try to see the patterns in the code that you have working and try to make the SHT30 work from what you learn. If it does not work as you want then post here the full code you have and what it is/isn't doing and you should get some help.
Battery based atmega328p sensor (no SMD)
OpenHardware.io • mysensors nrf24l01 battery atmega328 • • openhardware.io

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When you read the data sheet correctly you can see, that the distance between the pins is different for a AA and AAA battery holder. That`s why I was asking if somebody can recommend a holder that fits.

💬 mySensors Hit Train

Suggested Topics

devDuino Sensor Node V2.2 (ATmega 328)
OpenHardware.io • mysensors devduino temperature sensor mcp9700 • • openhardware.io

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SHT30 on arduino
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💬 mySensors Hit Train

Suggested Topics

devDuino Sensor Node V2.2 (ATmega 328) OpenHardware.io • mysensors devduino temperature sensor mcp9700 • • openhardware.io

💬 HVAC Recuperator control OpenHardware.io • mysensors hvac recuperator • • openhardware.io

💬 RFM69 Livolo 2 channels 1 way EU switch(VL-C700X-1_Ver_C2) OpenHardware.io • mysensors livolo • • openhardware.io

💬 Wirsbo/uponor thermostat OpenHardware.io • mysensors temperature thermostat floor heating uponor wirsbo • • openhardware.io

💬 Battery powered glass touch switch OpenHardware.io • mysensors contest2017 switch waf remote • • openhardware.io

💬 OH Mini-Multi-use Sensor Platform OpenHardware.io • mysensors motion temperature & humidity sensor • • openhardware.io

SHT30 on arduino My Project • mysensors • • yoshi824

Battery based atmega328p sensor (no SMD) OpenHardware.io • mysensors nrf24l01 battery atmega328 • • openhardware.io

106Online

10.6kUsers

10.8kTopics

111.0kPosts

devDuino Sensor Node V2.2 (ATmega 328)
OpenHardware.io • mysensors devduino temperature sensor mcp9700 • • openhardware.io

💬 HVAC Recuperator control
OpenHardware.io • mysensors hvac recuperator • • openhardware.io

💬 RFM69 Livolo 2 channels 1 way EU switch(VL-C700X-1_Ver_C2)
OpenHardware.io • mysensors livolo • • openhardware.io

💬 Wirsbo/uponor thermostat
OpenHardware.io • mysensors temperature thermostat floor heating uponor wirsbo • • openhardware.io

💬 Battery powered glass touch switch
OpenHardware.io • mysensors contest2017 switch waf remote • • openhardware.io

💬 OH Mini-Multi-use Sensor Platform
OpenHardware.io • mysensors motion temperature & humidity sensor • • openhardware.io

SHT30 on arduino
My Project • mysensors • • yoshi824

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OpenHardware.io • mysensors nrf24l01 battery atmega328 • • openhardware.io

106
Online

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Topics

111.0k
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