nRF5 action!

[NeverDie]

@Uhrheber said in nRF5 Bluetooth action!:

Those 2.4GHz pseudo stocked dipole antennas have always been crap.
Even if they had 9dBi, they'd lose most of it because of the thin lossy cables.
Never combine a high gain antenna with a long cheap cable, it's a waste of money.

Has anyone found a source for good quality pre-made cables with the connectors already attached? Again, I'd prefer to buy a "known good" product from a known good source than to keep rolling the dice.

[NeverDie]

Here's something which seems odd: I removed the bridge resistor from the Ebyte nRF52832, so that there was no soldered connection left. Then I checked it with my continuity meter, and they show connected anyway! Not really believing it, I tried it on a second module also, with the same result.

So, this means that the trace which is intended to go to the antenna is already connected to ground. Should it be? It doesn't seem right to me, but then I'm no expert.

Anyone?

[NeverDie]

By the way, from reading the instructions which came with the 4w booster, the recommended power input into it is between 7dbm and 20dbm. Obviously, the nRF52832 is 4dbm maximum, so this probably explains why the product is not excellent in this configuration. Bottom line: I don't think it's the solution.

[Jokgi]

@NeverDie from what I see in the picture of this module, it is using a Meandering Inverted F antenna. Part of that antenna is connected to ground. So you will measure a DC ground from anywhere along the antenna to ground.0_1507315872619_Ember -inverted F_120-5052-000_Designing_with_a_PCB_Antenna.pdf

[NeverDie]

Finally found some nRF52832 modules with a PA that doesn't require a minimum order of 5 units:

https://www.aliexpress.com/item/Based-on-NRF52832-R-D-Ultra-Long-Distance-Bluetooth-Module-Reserved-31-IO-PTR9618PA/32821223671.html?spm=2114.search0204.3.1.dARLTR&ws_ab_test=searchweb0_0,searchweb201602_4_10152_10065_10151_10130_5560016_10068_10344_10342_10343_10340_10341_10307_10060_10155_10154_10056_10055_10054_5370016_10059_10534_10533_10532_100031_10099_10338_10339_10103_10102_10052_10053_10107_10050_10142_10051_10324_10325_10084_10083_10080_10082_10081_5590016_10178_10110_10111_10112_10113_10114_10312_10313_10314_10078_10079_5570016_10073,searchweb201603_17,ppcSwitch_4_ppcChannel&btsid=327cd6c3-d0f5-4af1-a407-531c02bb7fd8&algo_expid=9498c2a3-88e0-4a4c-83de-3b50838e602b-0&algo_pvid=9498c2a3-88e0-4a4c-83de-3b50838e602b

[Jokgi]

@NeverDie Is there a schematic available?

[NeverDie]

@Jokgi said in nRF5 Bluetooth action!:

@NeverDie Is there a schematic available?

Not that I've seen, but there is this, which has a bit more info: https://www.aliexpress.com/store/product/PTR9618PA-Nordic-nRF52832-Module-PA-module-BLE-4-0-Module-Free-shipping/130096_32758834433.html

Taken at face value, it seems to imply that the unit includes DCDC regulation, that it does not include an external low frequency oscillator, and that pin P0.24 is used to enable/disable the PA.

[Uhrheber]

@NeverDie The datasheet is here: http://www.freqchina.com/plus/view.php?aid=1083

(Click on the "Data" tab.)

[Uhrheber]

@NeverDie
I bought it used on ebay, for little money.
But generally you can assume that everything that comes with an N connector is meant for (semi-) professional use.

Conversely, avoid everything that comes with a reverse-SMA connector and/or a thin cable.
It's usually crap.

[NeverDie]

@Uhrheber said in nRF5 Bluetooth action!:

@NeverDie The datasheet is here: http://www.freqchina.com/plus/view.php?aid=1083

(Click on the "Data" tab.)

Thanks! Just in time too, as it looks as though pin P0.20 is reserved also.

I just now did a breakout board for it. If anyone is interested in it, I can post it.

[rmtucker]

Plugged my NRF51822 board into a cr2032 button battery and it is sending voltage/Rssi/Random Temperature every 1min.
Just to see how low it goes and how long.
I also changed my controller over to Grafana and influxdb/Node-red.
So far i am suitably impressed.

[NeverDie]

@rmtucker

What are you using as the "controller" then? Is it Node Red? The other two aren't listed on the Mysensors controller page.

[NeverDie]

@Uhrheber said in nRF5 Bluetooth action!:

Conversely, avoid everything that comes with a reverse-SMA connector and/or a thin cable.
It's usually crap.

I changed the connection from the nRF52832 to the 4w booster over to this:
https://www.amazon.com/gp/product/B06WGY8FJB/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1
and it was an improvement. I can't help but wonder now whether an even thicker cable would work even better? What's a good source for getting even better (and thicker) cabling solutions of this type?

[rmtucker]

@NeverDie
Yes Node-red is the controller which is saving data into influxdb and then displaying the data in grafana.
But i am also using the node-red dashboard for any actuator nodes etc as grafana is really just for viewing the data.

[Uhrheber]

@NeverDie It isn't possible to crimp a thicker wire to a U.FL connector.
Therefore you have to use a thin cable, but keep it as short as possible.
There are thin cables with lower loss, but they tend to be very expensive.

[Uhrheber]

@NeverDie For a development board, it could be interesting to drive LEDs with P0.20 and P0.24, because they'll show you exactly when the board sends or receives.

[Toyman]

What about "long-range" iBeacons like Skylab or RedBear ones? Do they have some kind of PA or their "long-range" is just a marketing gimmick?

[Omemanti]

Hi Guys,

Since this topic passed the 1000 posts, can someone tell me if the NRF5* , for mysensors, is worth diving into?

And could someone be so kind, to sum up some pro/cons?
Would be much appreciated since I wasn't able to follow since post 400.

[mfalkvidd]

@Omemanti this thread has very litte information related to MySensors, so you haven't missed much on that topic.

https://forum.mysensors.org/topic/6705/mysensors-nrf5-platform is better for MySensors-related stuff. But the summary is that you'll need to be prepared to do troubleshooting and maybe also some coding. Some things are known broken, and a lot of things are not well tested.

On the other hand, nrf5* is an interesting solution, and real-world testing would be very valuable for making the MySensors support better.

[NeverDie]

I think when the nRF52840 gets released and made widely available, most people will eventually want it. It's a game changer. Right now it's early adopters with the nRF52832 and nRF51822, but even those offer smaller size, better range, much faster computation, and better radio power consumption.