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💬 Jukebox design journal

openhardware.io last edited by openhardware.io

https://www.openhardware.io/view/378/Jukebox-design-journal
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Koresh Contest Winner last edited by Koresh

I got this board a lot time ago and finally have a little time to complete it. MCU and usb-ttl work correctly, all power suppliers are fine, board fits the enclosure. Let's move forward
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Koresh Contest Winner last edited by Koresh

Finally solved a lot of problems and checked a lot of mistakes. But now the first version of this device works almost properly :trollface:

I will make a small report in the description asap
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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.
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@magpern said in MyQTherm - replace IQTherm heating thermostat: I actually am thinking somewhat in the line of discontinuing mysensors network. It is to much, hacks and tricks, and I forget everything in between sessions. I gave up more than once, also over period of years. Recently I came back again and decided to focus on the heart of the issue, getting my radios working and once you get over that, it starts to get fun again. I can respect if you already moved on to something else. I even cheated on MySensors and installed some 433 mhz devices too , just to get something working. You have to keep your interest in HA alive in the meantime. But the reward is great when you get MySensors working. There are "easier" solutions like Tasmota, 433mhz, etc. but not as customizable as MySensors. MySensors is for when you outgrow those other solutions and need something more custom.
MySensors Mini Scene Controller
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Thats perfect.. definitely have to try this.. Thanks!!
💬 jModule2
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@Andrew-Currie Downloaded KiCad and used it to import jBoard2.brd and output .gbr files via Plots plus the .drl file. Checked using GerbView and uploaded to PCBWay. Hopefully this will now work...
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Hello, can you post BOM please, according to schematics tantalum schould be 100uF bat tantalum cap in picture is 4.7uF
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💬 4-channel switcher/dimmer
OpenHardware.io • mysensors contest2017 dimmer • • openhardware.io

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@HouseIOT Sorry to trouble you, i use a mysensors-wifi-gateway with protocol 2.1.1 , and my homeautomation is home-assistant. I can't use your dimmer in my system. After read the reference, there need to add V-percentage and V-status in the code, as a newbie , I can't do it myself. So I wondered，can you do me a favor? Thanks a lot.
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@neverdie that's quite some money...

💬 Jukebox design journal

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💬 Jukebox design journal

Suggested Topics

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

💬 MyQTherm - replace IQTherm heating thermostat OpenHardware.io • mysensors thermostat heating radiator iqtherm • • openhardware.io

MySensors Mini Scene Controller OpenHardware.io • mysensors arduino battery contest2016 • • openhardware.io

💬 jModule2 OpenHardware.io • mysensors contest2017 • • openhardware.io

💬 MySensors Easy Pro Mini OpenHardware.io • mysensors contest2017 atsha204a ota • • openhardware.io

💬 MySensors InCan double light switch OpenHardware.io • mysensors nrf24l01 relay switch light hlk-pm01 acdc in-wall • • openhardware.io

💬 4-channel switcher/dimmer OpenHardware.io • mysensors contest2017 dimmer • • openhardware.io

💬 RFM69 Raspberry PI Zero(W) Shield(HAT) OpenHardware.io • mysensors rfm69 raspberry pi • • openhardware.io

63Online

11.4kUsers

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

💬 MyQTherm - replace IQTherm heating thermostat
OpenHardware.io • mysensors thermostat heating radiator iqtherm • • openhardware.io

MySensors Mini Scene Controller
OpenHardware.io • mysensors arduino battery contest2016 • • openhardware.io

💬 jModule2
OpenHardware.io • mysensors contest2017 • • openhardware.io

💬 MySensors Easy Pro Mini
OpenHardware.io • mysensors contest2017 atsha204a ota • • openhardware.io

💬 MySensors InCan double light switch
OpenHardware.io • mysensors nrf24l01 relay switch light hlk-pm01 acdc in-wall • • openhardware.io

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