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devDuino Sensor Node V2.2 (ATmega 328)

openhardware.io last edited by openhardware.io

https://www.openhardware.io/view/85/devDuino-Sensor-Node-V22-ATmega-328
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gregl Hero Member last edited by

ive used these with mysensors for several years now... they work great. Batteries last ages!
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urbangreen last edited by

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. ??
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@Dwalt Thank you very much, now I understand better why the measurement of the voltage on input A0 was never good ..
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@dzungpham0703 I buy them on Aliexpress: https://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20180706102504&SearchText=HTTM If you apply hot air it is easy to take off the white "double sided tape" and the plastic.
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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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thanks for you reply Fumée Bleue.
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When you post the sketch, please post the text, not a photo of the screen.
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@shabba Hi, unfortunately I don't have time and patience for doing BOM's on all of my projects but in this case it's not very hard as the external component count is greatly reduced by using the NRF51822 RF SOC which is a PTR5518 module from Aliexpress. Other than that there is the Microchip touch sense controller - MTCH105 and the usual smd resistors(0603) and caps. Other than that you're not forced to use and solder the onboard dc-dc converter so you don't have to worry about those components - you just need to solder the 3V_EN jumper to use the Livolo 3V output coming from the main relays/power supply board.
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The choice of MOSFET can be tricky. Seems that irlz44n was discontinued so you may need to find one adapted to the voltage and current you want to handle. In all the cases you need to get a logic MOSFET too, meaning that they are fully open usually around 1 to 3V. Also I'm sort of confused as it seems to me that L7812CV is a Voltage regulator, not a MOSFET. So if you are actually using that in the MOSFET spot it will definitively not work. Especially if you are handling high current or voltage I would recommend using one from a reputable source for your MOSFET, I recently switched from mouser / digikey / aliexpress to mostly use http://www.arrow.com as you get free regular shipping, event if you order a couple of components (no affiliation to them whatsoever).

devDuino Sensor Node V2.2 (ATmega 328)

Suggested Topics

💬 jModule
OpenHardware.io • mysensors contest2016 • • openhardware.io

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devDuino Sensor Node V2.2 (ATmega 328)

Suggested Topics

💬 jModule OpenHardware.io • mysensors contest2016 • • openhardware.io

💬 Wireless Touch Switch: Relay Model - (For Livolo crystals) OpenHardware.io • mysensors nrf24l01 relay switch light light switch livolo • • openhardware.io

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

💬 MySensors Linky OpenHardware.io • mysensors arduino mysensor arduino pro mini linky edf enedis • • openhardware.io

pressure sensor MPS20N0040D My Project • mysensors • • Sameh Bouhafs

💬 NRF51822 Livolo 2 channel 1 way EU switch(VL-C700X-1_Ver_C2) OpenHardware.io • mysensors livolo nrf51 • • openhardware.io

💬 nRF24L01 Adapter Board (AH) OpenHardware.io • mysensors • • openhardware.io

💬 MySGrowLED - MySensors control for Grow Lights or Greenhouse OpenHardware.io • mysensors nrf24l01 temperature atsha204a led i2c eeprom at25df512c fan grow light • • openhardware.io

25Online

11.7kUsers

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113.0kPosts

💬 jModule
OpenHardware.io • mysensors contest2016 • • openhardware.io

💬 Wireless Touch Switch: Relay Model - (For Livolo crystals)
OpenHardware.io • mysensors nrf24l01 relay switch light light switch livolo • • openhardware.io

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

💬 MySensors Linky
OpenHardware.io • mysensors arduino mysensor arduino pro mini linky edf enedis • • openhardware.io

pressure sensor MPS20N0040D
My Project • mysensors • • Sameh Bouhafs

💬 NRF51822 Livolo 2 channel 1 way EU switch(VL-C700X-1_Ver_C2)
OpenHardware.io • mysensors livolo nrf51 • • openhardware.io

💬 nRF24L01 Adapter Board (AH)
OpenHardware.io • mysensors • • openhardware.io

💬 MySGrowLED - MySensors control for Grow Lights or Greenhouse
OpenHardware.io • mysensors nrf24l01 temperature atsha204a led i2c eeprom at25df512c fan grow light • • openhardware.io

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