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

valley_nomad wrote: They haven't shipped my 3-in-1 module I ordered three days ago. Its status has been in "Processing" for days
I don't remember it was a pre-order item. Do you guys experience the same thing?

they are now showing as expected restock 24th april, I think they oversold their initial order so some people will have to wait for them to come in again

HappyHarry wrote:

valley_nomad wrote: They haven't shipped my 3-in-1 module I ordered three days ago. Its status has been in "Processing" for days
I don't remember it was a pre-order item. Do you guys experience the same thing?

they are now showing as expected restock 24th april, I think they oversold their initial order so some people will have to wait for them to come in again

Check my order and it shows shipped...now just sit tight and wait... yep they are out of stock for those that did not order early...now showing restock April 22

It should be possible to connect the 4 chip selects on the 4 in 1 board to the lowest 4 bits of a 8 to 3 line encoder (e.g. M74HC148) and connect the lowest two bits of the encoder outputs to pa select inputs for the module. This is untested but i can knock up a schematic if anyone is interested in trying and has a board.

HappyHarry wrote:

valley_nomad wrote: They haven't shipped my 3-in-1 module I ordered three days ago. Its status has been in "Processing" for days
I don't remember it was a pre-order item. Do you guys experience the same thing?

they are now showing as expected restock 24th april, I think they oversold their initial order so some people will have to wait for them to come in again

I put my order within 12 hours after it was available on April 4th or 5th. It looks like that they must had only a few in the first batch

according to bg's website my order was placed in apr 5th at 15:43 and although it showed as in stock when I placed my order my expected shipping date is the 20th, I don't know if it's because I ordered a few and they didn't have enough left or what, but it was definitely showing as in stock when I ordered, perhaps their stock tracking isn't real time?

Hello everyone,just wanted to know if it's possible to connect the 3in1 module to a devo 7e that has an upgraded cyrf 8s stock module,also is it worth it or just purchase the devo 10 and install the 3 in 1?Any feedback would be greatly appreciated.

Scopeuk wrote: It should be possible to connect the 4 chip selects on the 4 in 1 board to the lowest 4 bits of a 8 to 3 line encoder (e.g. M74HC148) and connect the lowest two bits of the encoder outputs to pa select inputs for the module. This is untested but i can knock up a schematic if anyone is interested in trying and has a board.

I'm interested about your project, but it seems not easy, what I can get from TX as input is only chip select signal, I was told chip select signal is a pulse , not high or low signal, encoder seems not able to handle this signal, that's why I still use a dip SW as antenna selection, if you have any better idea about this, I will try it, thanks a lot.

C0ckpitvue 777 wrote: Hello everyone,just wanted to know if it's possible to connect the 3in1 module to a devo 7e that has an upgraded cyrf 8s stock module,also is it worth it or just purchase the devo 10 and install the 3 in 1?Any feedback would be greatly appreciated.

IMHO, I will get a devo 10, there are more SW, more memory for code, no need to mod. power issue, easy installation for 3in1 module.

Thanks dc59,greatly appreciate the feedback.

Can anyone confirm if the chip selects are pulses or constantly asserted whilst the select module is being used?
If they are high whilst in use this can be done with a single logic chip, if they are pulses its down to a micro controler (attiny4313 comes to mind) and some semi trivial code to do the translation

Chip select is not pulse by the nature of SPI protocol, but it does not cover the whole activity period of the radio chip. It's deassertion marks the end of a command, RF chip can be active transmitting or receiving something afterwards.

Ok that rules out the trivial solution with a single logic chip.

Can someone (dc59?) ask the manufacturer for the schematics? Or have anyone seen them? It would be much easier to know how they deal with PA/LNA switch, CE signal for nRF24L01 etc.

No problem,I will ask for schematics later today.
The TaoBao told me chip select is pulse.....

Scopeuk wrote: It should be possible to connect the 4 chip selects on the 4 in 1 board to the lowest 4 bits of a 8 to 3 line encoder (e.g. M74HC148) and connect the lowest two bits of the encoder outputs to pa select inputs for the module. This is untested but i can knock up a schematic if anyone is interested in trying and has a board.

I also think it is possible and i will try it, if my module arrivied in germany.

From Banggood:
"tem 1: [1046304]CC2500 NRF24L01 A7105 Multi RF 3 IN 1 Wireless Module for DEVO Transmitter
Predicted Restocked Date: 2016-04-23 14:50:48"

Wow BG's restocking prediction has the time with resolution of one second

Thanking about changing to 4-in-1. What is its performance?

After reading through some posts here, I believe the signals for those 4 chip selecting pins must be level signal. So Scopeuk's proposal should work.

Update: victzh is right about the chip selecting signal. it is level signal. But it is actually for SPI communication. It disappears when there is no SPI activity. So controlling antenna switch automatically needs more than a simple 4-to-2 encoder

I don't know the details of the existing multi-module board, but doesn't it already have the chip select de-multiplexing handled via a ATTiny? Would it be possible to use it to de-multiplex the 2 line chip selects and use the 3 in 1 instead of the separate modules as a temporary solution? Just wire the 3 in 1 to one of the module headers and also hook it up to the de-multiplexed chip select lines of the 2 unused headers. This would also make the 3 in 1 software compatible with a fully populated multi-module board.

valley_nomad wrote:
....victzh is right about the chip selecting signal. it is level signal. But it is actually for SPI communication. It disappears when there is no SPI activity. So controlling antenna switch automatically needs more than a simple 4-to-2 encoder ...

One possible solution: In addition to using that encoder, add a 4-bit register ( e.g. 74LS95B ) between the encoder and 4 chip selecting pins of 4-in-1 module so that the status of these signals can be stored or locked with the trigger from the SPI clock. It should work because the clock stops before chip selecting signal disappears.... With 2 small logic chips the solution is still simple.

valley_nomad wrote:

valley_nomad wrote:
....victzh is right about the chip selecting signal. it is level signal. But it is actually for SPI communication. It disappears when there is no SPI activity. So controlling antenna switch automatically needs more than a simple 4-to-2 encoder ...

One possible solution: In addition to using that encoder, add a 4-bit register ( e.g. 74LS95B ) between the encoder and 4 chip selecting pins of 4-in-1 module so that the status of these signals can be stored or locked with the trigger from the SPI clock. It should work because the clock stops before chip selecting signal disappears.... With 2 small logic chips the solution is still simple.

If you are going to add yet another chip, then it would be smarter, smaller and cheaper to do it with attiny instead. Pick one of 14pin tinys and implement whatever switching logic you need. This should be straight forward code, no advanced techniques, no special peripherals. Plain gpio. Just do pin reads and port sets in tight loop inside main and you'll be golden.

I am waiting for my 4in1 to arrive and this is exactly the way I am going to use it

For the 4-1, why not use the MM pcb like BirdBarber suggested and add to the Attiny source, the chunk of code needed ?