Add schematic for Uno (5v) with level shifters + RFM about rfm69-mqtt-client HOT 8 CLOSED

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RFM69 is also likely to be damaged when IO ports are hooked up to 5 volts.
I have never used a setup with level shifters, so I cannot provide a schematic for a 'working' setup.
It might be easier to convert your UNO to 3.3 Volts.
Have a look at: https://learn.adafruit.com/arduino-tips-tricks-and-techniques/3-3v-conversion

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https://forum.arduino.cc/index.php?topic=373128.0
I'm pretty sure it's possible with level shifters or converters.

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Yeah, I'm sure too.
In the gateway three devices (Uno, ethernet and RFM69) are connected to the same SPI signals. There is a need to 'float' the bus if no communication is taking place. This means extra restrictions on the way level shifters are used. Believe me, using a 3.3 Volt uno is a far better way to go.

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You might want to have a look at:
http://homeautomation.proboards.com/thread/114/logic-level-converters-rfm69hw
where a working config is dicussed.

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for Node I use an 8MHz 3v3 Pro Mini, but as for the gateway i want to use my arduino ethernetshield, I am kinda stuck on using a Uno and was going to use a levelshifter BOB or a CD4050. But as I like to keep my wiring simple, it might be a better idea to get a W5100 module and a 3v3 pro mini.
Having said that, maybe an esp8266 Gateway might be a better idea..... hmmm got some thinking to do

Update: decided for the W5100 module+ RFM69+ 3V3 Pro Mini
having come across several people who didn't get the RFM69 to work in combo w Ethernetshield, using leveladapter, while individual modules worked

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Hi Consolacion,

My feedback from the forum is that many find implementing the ESP8266 node a simpler way to start. There is no RFM69 needed, so no interfacing voltage problems. Also, the ESP8266 node incorporates an MQTT client and therefor needs no gateway. In this way a lot of complexity is avoided.

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Tnx yes indeed. Initially I came upon many people experiencing problems with it, but I just now built another gateway with an Wemos D1 and that gave no problems.
By the way, I haven't been buying Elektor for a long time, but I may coz of yr article

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