Hardware

From openhardware you can download the Gerber files and have them printed from your favorite pcb factory. As you may have noticed the pcbs supporting rfm69 do usually have a pro mini 3.3v socket. For nrf24 you still can't use lipo batteries without a ldo voltage regulator. Personally I'd prefer the rfm69 as you can choose the frequency you prefer while the nrf24 are stuck to the heavily crowded 2.4Ghz

@mfalkvidd Thank you. Then there should be no problem.

Actually yes, if you make an image from a SD card and you flash it back you get a system working at that previous state. I actually use dietpi that has a built in backup/restore feature that I already used few times and it even worked to restore to another RPI also running the same dietpi

@Yveaux ok thank you I will have a look at what is available in the arduino ports.

@Samuel235 I am looking at a CO sensor too, do you have any updates on the ones you are using? What is the exact model?

@maolintao did you have any working code for mysensors that works for the sx1278?

Probably custom took its time to clear them.

any updates on this?

@towme yes, the majority of MySensors users use the nrf24. It is cheap and many users prefer not having to install wires to all their sensors. But, maybe more importantly, nrf24 was the first communication supported by MySensors so the combined community has much more experience with it. All example sketches are supposed to work with any transport type (nrf24, rfm69, rs485, ...). The motion sensor example has a list where users can decide which one to use. But I see that the alternative of not enabling any of the transports might not be intuitive, so there the documentation could be improved. We should probably also update https://www.mysensors.org/about/components#the-radio to better explain non-radio alternatives. Big thanks for your feedback. It is feedback like this that continuously makes the documentation better.

You might consider one of these: https://lowpowerlab.com/shop/product/133 5V/1.5A Buck Regulator Murata OKI-78SR-5/1.5-W36-C instead of the L78M05. Felix at LowPowerLab has a discussion of testing he did on them for his doorbell design. Looks to be more efficient than the L78M05 in the same footprint.

The project is that I have a box with objects in it. Each object has a placeholder within the box. I want to place a sensor in the bottom of each placeholder and have it tell me if an object is within the placholder or not. With RFID i want to know what is missing without opening the box.

What about PINE64 ? Did anyone try it ? Actually I ordered it from kickstarter when it was launched in April 2016 ( I guess ) but I didn't have the enough time to run it.

Sensor DHT-11

I hope too. Good luck with that.

calibration of these "cheap" sensors is always the main problem of reliable measurements, they are mostly good at giving a trend more than the actual measurement

Good to know when I'm going to receive mine...

There's a library specifically designed to work with them: https://github.com/Sofcom/NRF24Lmodule-SE8R01 Also found another interesting library for working with other, different, "clones" of the nRF24L01: https://github.com/jnk0le/RFM7x-lib

Great thread.