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💬 NRF24 to RFM69 adapter

openhardware.io last edited by openhardware.io

https://www.openhardware.io/view/601/NRF24-to-RFM69-adapter
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Yveaux Mod last edited by Yveaux

The nRF24 has 5V tolearnt IOs, the RFM69 hasn't.
Too bad it doesn't have any level converters built in to make it completely compatible to nRF24.
Apart from that, nice work!
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sineverba Hardware Contributor last edited by

Oh, you are right. I will edit the description. My "prerequisites" - overall for battery powered sensors node - is to have the node at 3v3 (or less). This is the reason because I never thought to level converter
Thank you for nice work
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alowhum Plugin Developer last edited by

Very nice work!
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sineverba Hardware Contributor last edited by @alowhum

@alowhum thank you
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Hardware • rfm69 micro trinket • • Michael_K

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Welcome to the club! Regarding radio's: The RFM69's with a C in the type have a smaller form factor (which is pin compatible with the predecessor RFM12B). The the 'W' and "HW' versions are larger in size and have more programmable pins (which MySensors does not use) but have exactly the same functionality within MyS. All the footprints on the boards available in OpenHardware.io are for the 'W' and 'HW' versions so I'd go with one of these. The 'W' uses way less power than the 'HW' which would be good the for the battery life of your nodes. Sensors powered by the grid can be 'HW', but usually, in the house a 'W' delivers enough TX power to get the message across. It might be a good idea to make your gateway with a 'HW'. Hope this gets you a bit further. Good luck and show us your results!
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💬 Carte Fil Pilote MySensors NRF24L01
OpenHardware.io • nrf24l01 chauffage fil pilote • • openhardware.io

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Any news on this project? Thanks!
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OpenHardware.io • mysensors motion temperature & humidity sensor • • openhardware.io

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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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OpenHardware.io • mysensors rfm69hw teleinfo • • openhardware.io

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I'm very interested by your setup. It has been a shame to have some low voltage power in order to measure power consumption I hope you can display something soon. Regards, Qq.
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💬 RFM69 Livolo 2 channels 1 way EU switch(VL-C700X-1_Ver_C2)
OpenHardware.io • mysensors livolo • • openhardware.io

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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.
[SOLVED] No communication between node and gateway - NRF24
Troubleshooting • nrf24l01+ arduino pro mini radio • • davy39

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Thank you both for your answers. With so many parameters to play with, it was not easy to understand what was wrong.. But I think I finally got a way do get my hardware working Here are my findings : I thought I got RFM73 version of NRF24-like radios. They look like like here and here. After checking and connecting all VCC and GND together, switch radios and arduinos... I got them suddenly working with Mysensors development librairies, then back to silence without apparent reason... Indeed like @mark_venn suggested, I went back to stable librairies and try so set a static ID. Worked well... until it went back to silence again ! Then, following @mfalkvidd advice, I realised that flashing the eeprom_clear sketch solved my all my problems ! My summary : Ensure that your 3.3V power supply is strong enough. Ensure that your arduino, radios and sensors are sharing the same GND and VCC. Use development librairies from github Flash eeprom_clear before flashing your mysensor sketches Then gatewaySerial and relayActuator should be able to communicate "out of box", mean you'll monitor some lines like this on the gateway serial : 0;255;3;0;9;read: 0-0-0 s=255,c=3,t=15,pt=0,l=2,sg=0: Thanks again for your help, now I can start to play

💬 NRF24 to RFM69 adapter

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💬 NRF24 to RFM69 adapter

Suggested Topics

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54Online

10.9kUsers

11.0kTopics

112.3kPosts

So many arduino and radio choices!
Hardware • rfm69 micro trinket • • Michael_K

ATMega328p board w/ NRF24l01+ and Bluetooth module sockets
OpenHardware.io • mysensors board • • openhardware.io

💬 Carte Fil Pilote MySensors NRF24L01
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💬 OH Mini-Multi-use Sensor Platform
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54
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