LibrePilot Forum

Development => Hardware => Topic started by: xfce on August 19, 2017, 09:29:07 am

Title: oplink(100mW/1W)+hc05/06
Post by: xfce on August 19, 2017, 09:29:07 am
I am designing oplink+bt , oplink is compatible with RFM22(100mW max) and RFM23(1W max).

3D PCB as below

top
(https://vgy.me/mtJ9rp.jpg)

bottom
(https://vgy.me/MX8HVw.jpg)

and real PCB
(https://vgy.me/gIgd3r.jpg)

Now I am testing them, after all test OK, if someone like, i will make a batch :)
Title: Re: oplink(100mW/1W)+hc05/06
Post by: f5soh on August 19, 2017, 11:42:27 am
Hi,

Some remarks about pcb traces around the holes/screws, especially if they are for Vcc this is not really fine.
BT module will have the antenna in one border without ground in PCB.

(https://forum.librepilot.org/index.php?action=dlattach;topic=3746.0;attach=6551)

Adding a connector around the right edge will be fine for a JR module, using a straight SMA connector.
Please also consider adding big pads for soldering Vcc input wires directly.

Is the 5V regulator still ok with RFM23BP (1W) / 550mA @ 3S ?
Title: Re: oplink(100mW/1W)+hc05/06
Post by: Mateusz on August 19, 2017, 11:56:04 am
That is really cool idea, also some suggestions



Title: Re: oplink(100mW/1W)+hc05/06
Post by: TheOtherCliff on August 19, 2017, 04:58:42 pm
Will the HC05 antenna have reduced range, because it is close to ground plane, etc in main board?

Will RF from HC05 antenna cause problems in main board?
Title: Re: oplink(100mW/1W)+hc05/06
Post by: f5soh on August 19, 2017, 07:50:12 pm
Will the HC05 antenna have reduced range, because it is close to ground plane, etc in main board?

From some priced bluetooth module, here is guidelines.
This just make sense for optimal antenna radiation, as already reported.
(https://forum.librepilot.org/index.php?action=dlattach;topic=3746.0;attach=6553)
(https://forum.librepilot.org/index.php?action=dlattach;topic=3746.0;attach=6555)

Quote
Will RF from HC05 antenna cause problems in main board?
Likely not, power levels are really low (~3mW max)
Title: Re: oplink(100mW/1W)+hc05/06
Post by: Brian on August 20, 2017, 05:59:39 pm
I like the board with the same comments as others have made. I would also suggest using an F3 MCU, since it can do inverted UART, etc.

I'm currently designing a nano-oplink with the intent of using it as a receiver on nano-quad builds. It's just slightly bigger than the rfm22b module, and I plan to put an F3 on it.
Title: Re: oplink(100mW/1W)+hc05/06
Post by: xfce on August 21, 2017, 04:29:30 am
Thanks all
I have tested , all functions are OK :D
BT can work about 10 meters, I think it's OK.


And LP2GO is wonderful.
(https://vgy.me/QZu9ft.jpg)

test video
https://www.youtube.com/watch?v=nK7509WN4nk (https://www.youtube.com/watch?v=nK7509WN4nk)

1)The trace are VCC, and I will remove them next version,as the first version is a two layers PCB, maybe changed to 4 layers;

2)USB socket will moved away from BT module's antenna;

3)about JR module connector,  does it just use 2.54pitch? or I think the oplink's Flexi port is OK

4)it is a standard SMA footprint, so 90° or 180° SMA broth are OK;

5)next version can add Vcc PAD;

6)I can use F303, but could you please develop the firmware;

7)for the JR case, you can give me the PCB outline, i can try to redesign the PCB just fit the JR case,
or i can give the PCBA's 3D module in .stl file , could anyone  help me to design a 3D printed case







Title: Re: oplink(100mW/1W)+hc05/06
Post by: Brian on August 21, 2017, 05:39:51 am
Attached is a design that I started a while back. I believe the dimensions are correct, but it was never built. It was built for a standard case that I found available, but I don't remember the part number off hand. If I find it I'll post it.
Title: Re: oplink(100mW/1W)+hc05/06
Post by: xfce on September 02, 2017, 08:17:19 am
I have just use FreeCAD design a case, FreeCAD is simple and wonderful.
will print later :)

bottomcase
(https://vgy.me/c5f77U.png)

topcase
(https://vgy.me/bfXT3p.png)

update: It's done :)
(https://vgy.me/IZnjR1.jpg)