💬 Connecting the Radio

[napo7]

Hi !

It seems that the FRM69 library set the IRQ pin as optionnal. Can someone confirm that the IRQ pin is mandatory ?

[tekka]

@napo7 yes, it is mandatory since the driver is IRQ-dependent

[napo7]

Well, I had a look in RFM69 driver, and it seems that the interrupts handlers are never sets ?
Am I wrong ?

Edit : In facts, DIO0 is not used as an Interrupt source in RFM69 driver : it's a pin that informs the library that, either, a packet has been received, or , the frame we try to send has been sent.

So, the code doesn't use interrupts, but this pin is more a "Data available" pin.

[scalz]

@napo7
so, if data available or data sent, this can be an interrupt source for an mcu ;)
It's enabled in the init there https://github.com/mysensors/MySensors/blob/development/drivers/RFM69/RFM69.cpp#L123

[napo7]

Yes I noticed it !
Since it didn't mention IRQ pin, I didn't seen it at first !

What misleaded me, is that on LowPowerLab forums, some users says that you can absolutely discard this interrupt and poll the radio frequently to ask if a packet is available.

[adamp237]

I had this working perfectly on my Arduino Uno. I soldered it up to my Arduino Nano and it seems to work ok, but I'm not getting any data sent. The serial says it's connected OK but never sends any motion 1s or 0s. My MQTT server shows the following: Client mosqsub/3449-raspberryp received PUBLISH (d0, q0, r0, m0, 'mygateway1-out/255/255/3/0/3', ... (0 bytes))

Any idea what is going on? I've tested the motion sensor separately and that is sending a high value to pin 3 no worries.

[gohan]

@adamp237
Enable debug on the node and add some more serial prints in order to see better in detail where the code runs and where not

[siddmon]

where can I find the picture for connecting NRF to arduino uno?

[mfalkvidd]

@siddmon to my knowledge, Arduino Uno the same pins as on Arduino Nano, Arduino Pro Mini and all other atmega328-based Arduino boards.

[siddmon]

@mfalkvidd Thanks and yes, they have the same pins, I didn't see Uno in the table so I google it and got incorrect instructions.
Now that I used the same as nano my node seems work :)

[mfalkvidd]

@siddmon great! Thanks for reporting back.

[nitroburn]

Little mistake in the text, I don't think dupont cables are made of bread.
"the antenna need to be single core inside, only one wire, not multi-wire breaded like you can find in common dupont cable (not good for antenna.)"
should be
"The antenna need to be single core inside, only one wire, not multi-wire braided like you can find in common dupont cable (not good for antenna)"

[mfalkvidd]

@nitroburn thanks! I've updated the page.

[nitroburn]

@mfalkvidd No problem, did make me a little hungry though.

[mfalkvidd]

:bread: :bread:

[Grave]

Can anyone change the text for "Configuring MySensors for RFM69". When you want to use another pin for cs it´s not this code:

// #define RF69_SPI_CS 15 // If using a different CS pin for the SPI bus

but this

// #define My_RF69_SPI_CS 15 // If using a different CS pin for the SPI bus

[mfalkvidd]

@Grave thanks for pointing this out. From looking at the source code, it looks like it should be MY_RFM69_CS_PIN. I have updated the text. Could you check if I got it right?

[Grave]

Thanks, you are right.

[joseyapor]

which one is better RFM69 or NRF24L01+

[gohan]

The problem is that nrf24 have many crappy clones that have limited range and it is difficult to find the original ones. Rfm69 is slower but have better wall penetration and modules come in 3 frequencies.