[SOLVED] NRF24L01+ stops working

[TisselTasse]

I just realized that I should ensure that it's a 3v3 and not a 5v pro mini I have, I got it from China and I'm not really sure what I got. Will check this evening with my multimeter on the Vcc pin if 3v3 or 5v.

[mfalkvidd]

Yes, that's exactly what I was asking :)
You probably mean a ftdi adapter, like this? http://s.click.aliexpress.com/e/FeMfuNJIY
Does the adapter deliver 3.3V or 5V? (You can measure with a voltmeter)
You connect the power through the ftdi header on the Pro Mini, right? (The 6 pin connector at the short side of the Pro Mini)

Some ftdi adapters have the possibility to switch between 3.3 and 5V using a jumper.

The Pro Mini needs 3.3V from Vcc (which is available on the ftdi header) or 5-12V on the RAW pin.

[mfalkvidd]

If you have a magnifying glass, a good camera och really good eyes, you can read the text on the voltage regulator to determine if it is a 3.3V or 5V. The voltage regulator is here: http://forum.arduino.cc/index.php?action=dlattach;topic=194995.0;attach=57293

Or, as you suggested, measure the voltage between Vcc and GND when powering the Arduino through RAW and GND.

[TisselTasse]

Ok so I have additional stuff to check, I'm using the USB to serial adapter from Kjell & CO. It only 4 pins...

But I understand the problem. Will also check what the USB to serial is connected to if it's the RAW or the Vcc

[mfalkvidd]

Do you mean this? http://www.kjell.com/se/sortiment/el-verktyg/elektronik/arduino/tillbehor/usb-till-seriell-adapter-for-arduino-p87898
In that case it supplies 5V so you need to connect it to Raw, GND, Rxd and Txd on the Pro Mini.

[TisselTasse]

Yes it's that one! I almost sure that I have it connected to the wrong place then... It's connected to the four legs in in the center of the short side of the board.

[mfalkvidd]

Yeah, that should be the source of the problem. The Arduino and the radio are getting 5V and they don't like that. Use the RAW pin instead and you should be fine.

You might want to buy a ftdi adapter from the link above. They are quite cheap, and work well. You need to press the reset button on the Arduino every time you upload a sketch, right? With the 6-pin ftdi adapter you don't need to do that anymore. That, and the ability to switch between 3.3 and 5V is really nice.

[mfalkvidd]

Oh, and welcome to the MySensors forum :-) Great to have more fellow Swedes here :)

[TisselTasse]

Thanks a lot for your support and the warm welcome! I'll report back when I have verified at home and I will also considering buying a new 'progaming' cable

[TisselTasse]

For the first time it has been working for more that 5 hours...
It seems as I feed 5V on the Vcc pin on my mini pro.

Thanks a lot for all help!

[Daanoz]

The same issue here!

I got a 'nice' FTDI adapter with 5v <-> 3.3v switch.... After experiencing the same, i noticed that the switch on the adapter is bogus and it always outputs 5v... :astonished: