nRF5 action!

[Mike_Lemo]

@Toyman said in nRF5 Bluetooth action!:

@Mike_Lemo

http://www.arduino.org/learning/reference/ble

This is their "homework" in anticipation of Primo launch. It does support nrf52

@scalz said in nRF5 Bluetooth action!:

@Mike_Lemo @Toyman
BLEPeripheral lib from sandeep is working fine with nrf52832, as i'm using it ;)

Regarding the sch above, it looks like a classic circuit (in LDO mode, not surprising as DCDC mode is optional). I'm not using same values but this should work..

If you say so that's great I've downloaded that BLEPeripheral library opened one of the test and led examples and there are a few things I don't understand why would I have to define those IRQ pins and include SPI library to use the BLE on board?

If order to send data back and forth between peripheral and central you have to use this function:?

to read: switchCharacteristic.value();
to write:characteristic.setValue(value, length);

do you maybe have a little simple example to establish a connecting between central and peripheral with sending random data and peripheral and a smartphone?

[mtiutiu]

@NeverDie

For DC-DC converter you need to add some external inductor(s) and some capacitor to the DCC pin if I remember correctly. This can be observed here:

And more than that it needs to be enabled from the SDK also.

I didn't read the official datasheet and the recommendations from it yet...so I don't know all the implications.

From what I've read so far this needs to be added before anything else(I think a good place is the before hook from MySensors):

void before() {
  NRF_POWER->DCDCEN = 1;
}

And maybe this will shed some light too: https://devzone.nordicsemi.com/question/69091/a-question-about-nrf52832s-dcdc-and-ldo/

[scalz]

@mtiutiu there is a little confusion :) this is the reference sch for nrf51. It is a bit different for nrf52.

@Mike_Lemo no you dont need to set these pins which could be removed from the init function.
Yes these functions are used for ble comm.
I think sharing my unfinished code is useless (arduino & phone) if you have troubles with arduino examples. I have no time for an howto actually and little bit out of mysensors scope imho .

The arduino examples are working fine.
There are already written howtos at sparkfun, adafruit, blogs etc
If you need more infos, maybe you can get more help on arduino forum too..
And for general understanding of ble and its mechanisms (providers, services, characteristics..), you can take a look at bluetooth sig.
Finally for custom phone app, you have to code with your preferred techno or use nordics app for simple debug

[mtiutiu]

@scalz

My bad. I corrected the initial post. Hope is all well now.

I'm going to try this one too when I have time wt51822-s4at

This is the cheapest of all that I found so far and yes it's not a nrf52832 but a nrf51822 - for my purpose this one is very good too. It doesn't have all the pins exposed - only 7 of them but again it should fit my general usage. I'm curious about its performance though. I'll see that when I get my hands on it. This is the official datasheet(or so it seems): https://4tronix.co.uk/picobot2/WT51822-S4AT.pdf

[NeverDie]

@NeverDie said in nRF5 Bluetooth action!:

They sent me two files, but I have no idea what they are, or how to open them. Maybe someone here recognizes them or can open them?
0_1500890784640_E73-2G4M04S-PCBLIB.PCBLIB
0_1500890793687_E73-2G4M04S-PCB-V1.0.PCBDOCPreview

Opening the first file in notepad, I notice that it says, "PCB 6.0 Binary Library File ". I had asked Ebyte for either the module schematic or a reference design using their part, so I'm guessing this is it, in some sort of PCB CAD file.

[mtiutiu]

@NeverDie

I think they use Altium Designer and that those are files generated with it.

[Toyman]

@mtiutiu if so, the free viewer is available at their site

[Nca78]

@mtiutiu I have ordered a few of those modules too, the big question is antenna performance as it seems rather small.
It's incredibly cheap and has enough pins to drive most of the MySensors nodes, too bad it's missing the 32K crystal for low power Bluetooth :(

[mtiutiu]

@Nca78

I think that if we use a serial gw based on nrf24l01 pa lna variant should help cover a regular house. At least this is my intent but until then I need to prepare some test environment. And if using nrf5 repeater nodes also should help with coverage - this doesn't work for battery powered nodes I know. But I think there should be some nrf5 nodes that are powered permanently - like actuators for example.

[mtiutiu]

@NeverDie

Can you upload those files somewhere so that I can download them? I can't do that from the links you pasted here in this forum.

I also found this altium -> kicad online converter but I don't know how well it works.

[NeverDie]

@mtiutiu said in nRF5 Bluetooth action!:

Can you upload those files somewhere so that I can download them? I can't do that from the links you pasted here in this forum.

https://spaces.hightail.com/space/WMbime1pXn

[mtiutiu]

@NeverDie

Doesn't work for me so maybe it would be best to obtain a pdf or something readable for all of us from the manufacturer.

[NeverDie]

Is no one else able to download the files either?

[NeverDie]

@Nca78 said in nRF5 Bluetooth action!:

@NeverDie how many GND pins did you connect ?
It might be a stupid suggestion but maybe all GND pins are not connected together ?

Good question. I connected to just one GND pin. However, I just now checked with a DMM, and all the exposed GND pins on the module have continuity to one another. So, based on that, I'm assuming any additional outside connections would be redundant anyway?

[mfalkvidd]

@NeverDie said in nRF5 Bluetooth action!:

Is no one else able to download the files either?

From the forum, no. From hightail, yes.
I don't know which program to open them in though.

[NeverDie]

@mfalkvidd said in nRF5 Bluetooth action!:

I don't know which program to open them in though

The current theory (see above) is that maybe it's Altium Designer, which has a free viewer.

[NeverDie]

@NeverDie said in nRF5 Bluetooth action!:

One thing I notice on the Ebyte module is that no RESET pin is exposed. Isn't that a bit odd?

Correction: According to the Nordic datasheet, PO.21, which is exposed on the Ebyte modle, can also serve as the reset pin. I was thrown off because Sparkfun labeled it RESET on their board's silkscreen, not "PO.21".

[NeverDie]

@Nca78 said in nRF5 Bluetooth action!:

I have ordered a few of those modules too,

Do let us know if either of you are able to program it. After this Ebyte experience, I won't be taking it for granted anymore.

[mfalkvidd]

@NeverDie not sure if it applies to this case, but at 18:04 in https://youtu.be/JXQLI-nXqmQ it is mentioned that the chip's identifier needs to be included in some list when the softdevice is compiled (or something along those lines, I am not yet familiar with the vocabulary).

[NeverDie]

@mfalkvidd said in nRF5 Bluetooth action!:

@NeverDie not sure if it applies to this case, but at 18:04 in https://youtu.be/JXQLI-nXqmQ it is mentioned that the chip's identifier needs to be included in some list when the softdevice is compiled (or something along those lines, I am not yet familiar with the vocabulary).

My understanding (which may be wrong) is that in this context a "softdevice" is a veiled reference to the bluetooth stack and/or related bluetooth code, which at present the mysensors code isn't using. In any case, when I programmed both the adafruit and the sparkfun using the mysensors code, I didn't include a chip identifier in a list, nor any soft devices, and it worked anyway.