Devo 12s 3in1 / 4in1 RF module neat installation.

djtrance
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06 Jun 2016 14:01 #50035 by djtrance

Replied by djtrance on topic 3in1 / 4in1 RF module

PB, this is a good new.
Maybe you could consider using a larger memory. I don't know the specification about this adapter, but maybe can be good if we have some pins exposed for a future aplication, like Voice alerts or other type. now voice alert is using the training port, and would be good if we can use only one module to talk with other new modules.

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PhracturedBlue
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06 Jun 2016 15:49 #50042 by PhracturedBlue

Replied by PhracturedBlue on topic 3in1 / 4in1 RF module

The big issue with a larger memory is that the sector size goes up as I recall. Otherwise it is probably not too hard to handle. We've already put in place a more generic spi_flash handler that can handle various different memories. Extending that part should nnot be too hard. The board does have, I think, 1 unused pin on the 3-to-8 decoder that could drive another SPI slave, but we're probably tasking the SPI subsystem pretty heavily using the same port for both flash and protocol, and I'm not sure how another high-bandwidth operation (like voice) would work with it. This board does not have a 2nd processor on it, and so will never have all the features of the UniversalTx I was designing. But it will be cheaper to manufacture, and should be suitable for all Devo radios

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victzh
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06 Jun 2016 16:20 #50044 by victzh

Replied by victzh on topic 3in1 / 4in1 RF module

@PhracturedBlue, thanks for kind words, but we're all grateful for your initiating and supporting of DeviationTX project in general, and AT9 and this board support in particular.

Of course when it's ready (iteration or two maybe - that was the first physical design we built and tested) we'll try to persuade the manufacturer in China to complement his 4-in-1 module with this board. And in any case I'll publish the design so anyone can make it themselves. And if the 4-in-1 board manufacturer will not make this board it can be done in small series and sold by us - I'm also reluctant to sell RF without FCC approval and it is quite costly for such a small series.

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cmpang
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06 Jun 2016 16:52 #50045 by cmpang

Replied by cmpang on topic 3in1 / 4in1 RF module

i have some talk with and bought several 3in1 and 4in1 modules from the China manufacturer.
if you so wish, i am more than willing to communicate with him regarding your proposal for him to make the board .,
to start easy, please write down a short description about the project so that i can translate and talk to him.

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rasqba
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06 Jun 2016 17:41 #50046 by rasqba

Replied by rasqba on topic 3in1 / 4in1 RF module

Do i understand correctly, that the probably best and most reliable option now is to replace the stock 3,3v ldo with MIC5219?

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victzh
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06 Jun 2016 18:10 #50047 by victzh

Replied by victzh on topic 3in1 / 4in1 RF module

@cmpang, thanks, but he speaks English in my experience. At least he answers to emails in English. It's just a bit early, the board needs couple tune-ups and I would not like it to leave bad taste in the mouth like 4-in-1 and 3-in-1 first iteration apparently did. I'll have the updated module as soon as it's available and will test it and then talk to him about production with 4-in-1 pre-mounted.

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cmpang
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06 Jun 2016 18:15 #50048 by cmpang

Replied by cmpang on topic 3in1 / 4in1 RF module

noted..

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goebish
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I Void Warranties

06 Jun 2016 18:20 - 06 Jun 2016 18:32 #50049 by goebish

Replied by goebish on topic 3in1 / 4in1 RF module

Hi, I've a 4-in-1 board, still in its bag (1st version), has anyone found a working solution for the LNA problem with nrf24 and a7105 ?
I'd like to use it but I need LNA for a7105 (for AFHDS-2A protocol).

Last edit: 06 Jun 2016 18:32 by goebish.

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YJ
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06 Jun 2016 18:21 #50050 by YJ

Replied by YJ on topic 3in1 / 4in1 RF module

I think I described it in post 49211 clearly.

You have to look at your actual transmitter to determine what to do with the regulator (plus a 1ohm resistor.)

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goebish
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06 Jun 2016 18:33 #50051 by goebish

Replied by goebish on topic 3in1 / 4in1 RF module

YJ, not sure you were replying to my question, but I'm not talking of vreg issue, but no LNA for nrf24 / a7105

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PhracturedBlue
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06 Jun 2016 19:02 #50053 by PhracturedBlue

Replied by PhracturedBlue on topic 3in1 / 4in1 RF module

goebish,
I believe the rev2 4:1 boards will fix the a7105 LNA. I believe removing the pullup on the TX pin will fix the LNA on the nrf24l01. to fix the lna for A7105 on the rev1 board will require cutting the trace to pin 2 of the mux (pin is tied to 3.3V) and attaching it to one of the GIO pins, and then writing some code to control it. I haevn't tried it, but it will require some delicate soldering.

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goebish
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I Void Warranties

06 Jun 2016 19:17 #50054 by goebish

Replied by goebish on topic 3in1 / 4in1 RF module

Ok thanks, oh well, it will stay in its bag then

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dc59
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07 Jun 2016 00:51 - 07 Jun 2016 00:55 #50071 by dc59

Replied by dc59 on topic 3in1 / 4in1 RF module

victzh wrote: @cmpang, thanks, but he speaks English in my experience. At least he answers to emails in English. It's just a bit early, the board needs couple tune-ups and I would not like it to leave bad taste in the mouth like 4-in-1 and 3-in-1 first iteration apparently did. I'll have the updated module as soon as it's available and will test it and then talk to him about production with 4-in-1 pre-mounted.

Look forward to your real "Plug and Play" module for DEVO TX.

my first 4in1 module stuck on overheat issue, it got me a headache and seems no way to solve it.

Last edit: 07 Jun 2016 00:55 by dc59.

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YJ
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07 Jun 2016 02:14 #50072 by YJ

Replied by YJ on topic 3in1 / 4in1 RF module

goebish wrote: YJ, not sure you were replying to my question, but I'm not talking of vreg issue, but no LNA for nrf24 / a7105

I'm sorry for the confusion I was trying to address another poster.

Good luck with the module.

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Deal57
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07 Jun 2016 12:43 #50084 by Deal57

Replied by Deal57 on topic 3in1 / 4in1 RF module

PB you mentioned you have another pin on the 3-to-8 decoder that could drive another SPI slave. We've been struggling to get the voice processor integrated with the Trainer port as it conflicts with other usage (PPM In/Out), and I'm wondering if we could instead use an SPI to UART slave (or other I/O) to provide the extra serial TX we need to signal the voice responses?

Deviation Devo7e 3way switch mod, A7105, NRF24L01
Devo6s 2x2 switch mod, trim mod, haptic, multimodule, A7105, NRF24L01, CC2500
Devo12e 4-in-1 with voice mod -- it speaks!!

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PhracturedBlue
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07 Jun 2016 13:28 - 07 Jun 2016 13:28 #50087 by PhracturedBlue

Replied by PhracturedBlue on topic 3in1 / 4in1 RF module

I don't think you want to use USART over the SPI2 port. The problem is that we are sharing this with high bandwidth timing critical features (flash memory and protocol) and UART code is likely to be too slow to be able to meet all requirements. Now if you can handle an 40MHz SPI signal (or depending on data size, even 2MHz) it is probably something that could be done. We'd need to get victzh to add an expansion port on the board, but we can probably work something out.

Last edit: 07 Jun 2016 13:28 by PhracturedBlue.

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wasp09
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07 Jun 2016 18:31 #50116 by wasp09

Replied by wasp09 on topic 3in1 / 4in1 RF module

goebish wrote: Ok thanks, oh well, it will stay in its bag then

Come on, you get to void its warranty.

If we are using extra ports to control PA/LNA switching on the N in 1, we can throw away the multiplexer. Just wire the ports directly to the PA/LNA chip and control the ports directly on every Set_TXRXMode().

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victzh
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07 Jun 2016 18:35 #50117 by victzh

Replied by victzh on topic 3in1 / 4in1 RF module

Not so easy. nRF24L01 has an auto acknowledgement mode in which it itself needs to switch PA/LNA - that's why multiplexer. It's wired wrongly, but it's a necessary part.

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wasp09
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07 Jun 2016 18:55 - 07 Jun 2016 18:59 #50118 by wasp09

Replied by wasp09 on topic 3in1 / 4in1 RF module

victzh wrote: Not so easy. nRF24L01 has an auto acknowledgement mode in which it itself needs to switch PA/LNA - that's why multiplexer. It's wired wrongly, but it's a necessary part.

I see, we need VDD-PA then. That's why I am still waiting for your 4 in 1.

Thanks.

Last edit: 07 Jun 2016 18:59 by wasp09.

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victzh
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07 Jun 2016 19:39 #50124 by victzh

Replied by victzh on topic 3in1 / 4in1 RF module

You need not only my board but also updated 4-in-1 module - it will have all lines wired properly.

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