xfce

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oplink(100mW/1W)+hc05/06
« 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


bottom


and real PCB


Now I am testing them, after all test OK, if someone like, i will make a batch :)
« Last Edit: August 19, 2017, 09:33:35 am by xfce »

f5soh

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Re: oplink(100mW/1W)+hc05/06
« Reply #1 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.



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 ?
« Last Edit: August 19, 2017, 11:47:05 am by f5soh »

Mateusz

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Re: oplink(100mW/1W)+hc05/06
« Reply #2 on: August 19, 2017, 11:56:04 am »
That is really cool idea, also some suggestions

  • Inverter for FrSky telemetry ? I think F303 which is pin-compatible with F103 has inverter in MCU, but not sure how easy to run Oplink firmware on F3 ?
  • Does it fit into standard Taranis module JR case ?


« Last Edit: August 19, 2017, 12:03:05 pm by Mateusz »

Re: oplink(100mW/1W)+hc05/06
« Reply #3 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?

f5soh

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Re: oplink(100mW/1W)+hc05/06
« Reply #4 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.



Quote
Will RF from HC05 antenna cause problems in main board?
Likely not, power levels are really low (~3mW max)

Brian

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Re: oplink(100mW/1W)+hc05/06
« Reply #5 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.

xfce

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Re: oplink(100mW/1W)+hc05/06
« Reply #6 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.


test video


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







« Last Edit: August 21, 2017, 04:49:50 am by xfce »

Brian

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Re: oplink(100mW/1W)+hc05/06
« Reply #7 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.

xfce

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Re: oplink(100mW/1W)+hc05/06
« Reply #8 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


topcase


update: It's done :)


« Last Edit: September 04, 2017, 02:48:42 am by xfce »