ZUMSpot Libre 'Hot Spot' (Supports DMR, D-Star, Fusion, P25) - Club Project ?

[Marrold]

Hello,

For those of you that don't know MMDVM (Multi Mode Digital Voice Modem) is a project that uses commodity microcontrollers and radios to operate digital voice repeaters and hotspots for DMR, D-Star, Fusion, and P25.

A group of amateurs have recently modified the firmware to support a modified RF7021SE RF Module and an STM32 dev board (Similar to an Arduino). This is the same RF Module thats in use in the DVMega and SharkRF OpenSpots, but as it's DIY its significantly cheaper. I think we could throw these together for £50ish.

A hotspot will allow you to connect to both major DMR Networks in the UK (Brandmeister and Phoenix), and the other modes can be connected to existing networks too (Although I'm not 100% clued up on these). Obviously you will need a radio that supports the mode to use the hotspot. Hotspots are ideal if you can't mount an external antenna, live in an area with little / no signal, or want to operate a handheld without being tied down by coax. 

I have a 'reference' PCB coming from Germany, but I still need to order the RF Modules (Ali Express) and TCXOs (mouser). If people are interested I can do a group order - if there's a few of us I think it would be nice if we subsidise one for the shack but that's open for discussion. 

RF Module £20  

STM32 Dev Board £5

Pi Zero W / Pi3 - £10-30

TCXO - £2.20 + VAT + Shipping 

PCB - Presumably not much

LEDs, Resistors - not much

Host Files: https://github.com/g4klx/MMDVMHost

Modem Firmware Files: https://github.com/juribeparada/MMDVM_HS

PCB Files: https://github.com/db4ple/MMDVM_HS_PCB_Single

TL;DR: £50ish Digital Mode Hot Spots, who's in?

Cheers

Matthew

2E0SIP

[Jan Szumiec]

Sign me up.

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[Mat Stace]

On Tuesday, June 6, 2017 at 4:29:38 PM UTC+1, Marrold wrote:

TL;DR: £50ish Digital Mode Hot Spots, who's in?

Me please

Cheers

Mat

2E0TPS

 

[JJ (g6vzm)]

Are we going to do a group order for the PCB?  If so I'm in.

JJ

[Samuel Keating-Fry]

I'd be interested. I might give me a good reason to actually get myself down to the space!

On 7 June 2017 at 10:53, JJ (g6vzm) <jj.so...@gmail.com> wrote:

Are we going to do a group order for the PCB?  If so I'm in.

JJ

--

[Marrold]

> Are we going to do a group order for the PCB?  If so I'm in.

The current 'open source' PCB is a simple single sided jobby, so the plan was to make them at the space. I think it could be improved, but I've not designed a PCB since school (Decades ago), so I'm planning on starting with the basic one and seeing if I get more ambitious further down the line, or a new design comes out. 

The main 'group buy' would be on the RF modules from Aliexpress and the temperature controlled oscillators from Mouser. I understand their shipping is expensive so it's sensible if we order them together.

I will leave this open for another couple of days and once we've got a final number we can figure out logistics.

Cheers

[Jan Szumiec]

We could just order 20 boards from China, I reckon they'd be here in ca 2 weeks.

On Wed, Jun 7, 2017 at 7:58 PM, Marrold <Mat...@marrold.co.uk> wrote:

> Are we going to do a group order for the PCB?  If so I'm in.

The current 'open source' PCB is a simple single sided jobby, so the plan was to make them at the space. I think it could be improved, but I've not designed a PCB since school (Decades ago), so I'm planning on starting with the basic one and seeing if I get more ambitious further down the line, or a new design comes out. 

The main 'group buy' would be on the RF modules from Aliexpress and the temperature controlled oscillators from Mouser. I understand their shipping is expensive so it's sensible if we order them together.

I will leave this open for another couple of days and once we've got a final number we can figure out logistics.

Cheers

On Wednesday, June 7, 2017 at 10:53:30 AM UTC+1, JJ (g6vzm) wrote:

Are we going to do a group order for the PCB?  If so I'm in.

JJ

--

[Marrold]

> We could just order 20 boards from China, I reckon they'd be here in ca 2 weeks.

Sounds sensible. If we're getting them manufactured I guess it's probably worth getting something slightly nicer, I'm trying to get hold of the files for this one as it has mounting holes and uses the space more efficently - 

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[Jan Szumiec]

Which STM32 module does that require? I've got a few Maple clones...

On Wed, Jun 7, 2017 at 10:44 PM, Marrold <Mat...@marrold.co.uk> wrote:

> We could just order 20 boards from China, I reckon they'd be here in ca 2 weeks.

Sounds sensible. If we're getting them manufactured I guess it's probably worth getting something slightly nicer, I'm trying to get hold of the files for this one as it has mounting holes and uses the space more efficently - 

On Wednesday, June 7, 2017 at 9:18:58 PM UTC+1, Jan Szumiec wrote:

We could just order 20 boards from China, I reckon they'd be here in ca 2 weeks.

On Wed, Jun 7, 2017 at 7:58 PM, Marrold <Mat...@marrold.co.uk> wrote:

> Are we going to do a group order for the PCB?  If so I'm in.

The current 'open source' PCB is a simple single sided jobby, so the plan was to make them at the space. I think it could be improved, but I've not designed a PCB since school (Decades ago), so I'm planning on starting with the basic one and seeing if I get more ambitious further down the line, or a new design comes out. 

The main 'group buy' would be on the RF modules from Aliexpress and the temperature controlled oscillators from Mouser. I understand their shipping is expensive so it's sensible if we order them together.

I will leave this open for another couple of days and once we've got a final number we can figure out logistics.

Cheers

On Wednesday, June 7, 2017 at 10:53:30 AM UTC+1, JJ (g6vzm) wrote:

Are we going to do a group order for the PCB?  If so I'm in.

JJ

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[Marrold]

Its these ones- http://www.ebay.co.uk/itm/STM32F103C8T6-Cortex-M3-Minimum-System-Development-Board-For-Arduino-NEW-TE435-/272234478549?hash=item3f62707bd5:g:Vh0AAOSwurZZEhJg

Im guessing anything with an identical chip / pinout will work

[Jan Szumiec]

We could tweak the board to include mounting holes, or anything else we might want to add and then send it to China.

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[Marrold]

Ok sounds like a plan. My board should arrive in the next couple of days, I will upload some photos and we can go about ordering the PCBs and components

On Tuesday, June 6, 2017 at 4:29:38 PM UTC+1, Marrold wrote:

[Marrold]

Hi All,

The board has arrived and it's smaller than I originally thought. There seems to be about 5 of us interested but it probably makes sense if some spare components to save ordering them again.

Jan, if you don't mind could you explore getting the boards made up? Happy to come into the space (or wherever) if you want to chat about it.

Is anyone else interested?

Pictures- 

On Tuesday, June 6, 2017 at 4:29:38 PM UTC+1, Marrold wrote:

[Jan Szumiec]

Is there a kicad source for these boards somewhere? What sort of changes are we looking for apart from mounting holes?

[Marrold]

KiCad files are here AFAIK - https://github.com/db4ple/MMDVM_HS_PCB_Single

Some mounting holes would be nice. I also think it's weird the status LEDs are on the 'underside' of the board, but for the sake of putting something together quickly its probably just worth sticking with the original

Cheers

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[Jan Szumiec]

I reckon that can be changed quite easily. Are these SMD LEDs, or THT?

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[Marrold]

LEDs and resistors are SMD.

Headers for i2c/serial (for external displays) are THT

[Jan Szumiec]

So there are two projects here: 'stm32duino' and 'stick' - I reckon we're aiming to adapt the first one. Looks like all that is required is to move the LEDs/resistors around and add mounting holes. I'll look into that tomorrow when I have access to a computer with a mouse, rather than a trackpad. :)

On Thu, Jun 15, 2017 at 3:58 PM, Marrold <Mat...@marrold.co.uk> wrote:

LEDs and resistors are SMD.

Headers for i2c/serial (for external displays) are THT

[Marrold]

Hello All,

Jan has kindly made some changes to the PCB design to accommodate some mounting holes which should make it easier to put it in an enclosure of some kind. The updated PCB is here- https://github.com/londonhackspace/MMDVM_HS_PCB_Single

We're at a point where we should probably order the bits-

Myself
Jan
JJ
Mat Stace

Sam

'The Shack'

Is anyone else interested? We need a final number to order the PCBs, RF modules from China, and the TCXOs / Resistors / LEDs from Mouser.

On Tuesday, June 6, 2017 at 4:29:38 PM UTC+1, Marrold wrote:

[David]

Hi there - I am interested, but how much woud it cousts, and would someone be interested in putting it together for me and then ship it to me in the US?

Thanks

--David

At 02:26 AM 6/19/2017, you wrote:

Hello All,

Jan has kindly made some changes to the PCB design to accommodate some mounting holes which should make it easier to put it in an enclosure of some kind. The updated PCB is here-Â https://github.com/londonhackspace/MMDVM_HS_PCB_Single

We're at a point where we should probably order the bits-

Myself
Jan
JJ
Mat Stace
Sam
'The Shack'

Is anyone else interested? We need a final number to order the PCBs, RF modules from China, and the TCXOs / Resistors / LEDs from Mouser.

On Tuesday, June 6, 2017 at 4:29:38 PM UTC+1, Marrold wrote:

Hello,

For those of you that don't know MMDVM (Multi Mode Digital Voice Modem) is a project that uses commodity microcontrollers and radios to operate digital voice repeaters and hotspots for DMR, D-Star, Fusion, and P25.

A group of amateurs have recently modified the firmware to support a modified RF7021SE RF Module and an STM32 dev board (Similar to an Arduino). This is the same RF Module thats in use in the DVMega and SharkRF OpenSpots, but as it's DIY its significantly cheaper. I think we could throw these together for £50ish.

A hotspot will allow you to connect to both major DMR Networks in the UK (Brandmeister and Phoenix), and the other modes can be connected to existing networks too (Although I'm not 100% clued up on these). Obviously you will need a radio that supports the mode to use the hotspot. Hotspots are ideal if you can't mount an external antenna, live in an area with little / no signal, or want to operate a handheld without being tied down by coax.Â

I have a 'reference' PCB coming from Germany, but I still need to order the RF Modules (Ali Express) and TCXOs (mouser). If people are interested I can do a group order - if there's a few of us I think it would be nice if we subsidise one for the shack but that's open for discussion.Â

RF Module £20 Â

STM32 Dev Board £5

Pi Zero W / Pi3 - £10-30

TCXO - £2.20 + VAT + ShippingÂ

PCB - Presumably not much

LEDs, Resistors - not much

Host Files:Â https://github.com/g4klx/MMDVMHost

Modem Firmware Files:Â https://github.com/juribeparada/MMDVM_HS

PCB Files: https://github.com/db4ple/MMDVM_HS_PCB_Single

TL;DR: £50ish Digital Mode Hot Spots, who's in?

Cheers

Matthew

2E0SIP

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[Marrold]

Hi David,

I've yet to finalise the costs but it will be around £50, assuming you use a Pi Zero or slightly more if you use a Raspberry Pi.

However, to be honest after shipping, import duty, support if it goes wrong etc you're probably best to get one direct from http://mmdvm.blogspot.com

Cheers

Matthew

[Marrold]

For those of you that you have missed it, Jan has kindly made some changes to the PCB to adjust the LEDs to a more sane layout and add some mounting holes.

The plan is to order all the bits for constructing the board (RF Module, Resistors, LEDs, Headers, Temperature Controlled Oscillator) this weekend. Fingers crossed everything arrives for next months club meeting although its not guaranteed.

You will need to supply your own host device / SD Card. Most people use a Raspberry Pi 3, but older versions and the Pi Zero will work.

Its worth noting that you're hoping to use a Pi Zero + Wifi, your milage may very. Realtime applications over 2.4Ghz can be poor in congested areas, although I've used it without any major issues.

I've also been told the Orange Pi's work well. I've ordered one of these to test it out - Orange Pi

Cheers!

On Tuesday, June 6, 2017 at 4:29:38 PM UTC+1, Marrold wrote:

[Jan Szumiec]

We've ordered 20 boards. Given we have that many, perhaps we could see who else is interested on Twitter?

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[Marrold]

Yeah I think thats not a bad idea, although we should probably wait until ones built and I've created a tutorial of some sort.

Cheers

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[Bill Burman]

I could be interested now - I've made the plunge and bought an MD380, flashed it with md380-tools, and played a bit with codeplugs. Seems pretty easy, although it seems GB7NS is the only thing I can hear in W14. A hotspot might be just what the doctor ordered...

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[Marrold]

Hi Bill,

We've ordered some spares so shouldnt be a problem -  I will keep you posted.

Cheers

[Marrold]

Greetings.

Hopefully we should have all the bits together in the next week or so.

As mentioned, you will need a 'host' device to drive it - most people go with a SoC like the Raspberry Pi, however more people are starting to use the Orange Pi Zeros as they're slightly cheaper. They're also the same width as the PCB Jan has made, which should make for a compact hotspot. 

If you're keen, they're available in the UK for £17.40 - Ebay
Or if you can wait for the slow boat from China, £10.69 - Ebay

Once we have all the bits, are people hoping to assemble them as a group, or take the bits and instructions and do it in their own time? Replacing the oscillators will require a hot air station, but I guess if someone wants to do it at home with a standard iron I can replace the oscillator in advance.

The costs are currently running at around the £40 mark-

Mouser Bits: £7.00
RF Module: £15.50
STM32: £3.00
PCB: £3 ish (I cant remember what Jan said...)

Soc: £10.69 (Assuming from China)

[Jan Szumiec]

BUILD-A-THON?

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[Samuel Keating-Fry]

I'm up for a build-a-thon! I could do with a bit of hot air practice...

I wasn't aware of the orange pi zero, looks great!

[Marrold]

Build-a-thon it is. There's usually plenty of knackered old PCBs kicking around the space to have a quick practice with hot air first.

I sent a handful of the boards to another amateur that already had the other bits and pieces ready and he's confirmed the boards are tested and working.

Here's G7RPG's handy work - G7RPG Zumspot https://imgur.com/gallery/i3reD

[Bill Darvill]

Hello all

Really don't know if you can help but hope so.

Have the RF7021SE & STM32 modified and working on breadboard but would like to fit to a proper PCB.

Can you kindly help out with this are you making up kits only?

Cheers

Bill    2E0FEI

.

[Marrold]

Hi Bill,

We may have a couple spare, it depends if we manage to fry any in the process. Are you able to wait a couple of weeks until we can confirm? 

Cheers

Matthew

2E0SIP

[Bill Darvill]

Brilliant Matthew, waiting is not a problem. Using Zumspot as is. Did have a board originally myself, but.... fried it myself, hence the breadboard :-)

[Marrold]

Another couple of updates, the bits have arrived from Mouser and I've confirmed 'Pi Star' will work on the Orange Pi (It works on the Raspberry Pi natively) 

For those of you that don't know, Pi Star is an image for use with MMDVM hotspots and gateways that provides a nice easy interface. If you're a tinkerer you may want to compile from source etc, but this is a good way to get started. 

I also forgot to mention you will need an SD Card (Class 10, 2GB or more) and if you're planning on using an Orange Pi Zero I'd suggest getting a heatsink (The Ras Pi ones fit) as they get hotter than the sun.

Cheers

[Marrold]

Another update, the Wifi doesn't work on Pi Star with the Orange Pi, although the Orange Pi wifi performance is meant to be pretty poor anyway.

The recommended option is a cheap USB wifi adapter. 

[Jan Szumiec]

Is a Pi Zero W sufficient to run this software?

[Marrold]

Yup. Tested and confirmed working.

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[Samuel Keating-Fry]

Hi Matthew,

Any tips for getting pi-star working with the orange pi? I'm not having much luck booting the Pi-Star_RPi_V3.4.1_20-Jul-2017.img image.

I've managed to get armbian working, so I'm reasonably sure the hardware is functioning correctly.

Thanks,

Sam M0SKF

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[Samuel Keating-Fry]

Ok, ignore me. I hadn't realised NanoPi used the same SoC. Now up & running with the NanoPi image.

S

[Marrold]

Sounds like you've cracked it.

Yes, the NanoPi image seems to work fine. I'll be sending an OrangePi Zero to MW0MWZ once it arrives as he's offered to optimise the image if he can.

Another minor update whilst I'm here, the modules seem to be taking forever to arrive from China. I will keep you posted.

Cheers

[Marrold]

Hi All,

It's with sadness that I write to inform you the ADF7021 RF modules made it as far as the UK and then got returned to sender for reasons unknown.

I am in touch with the seller and will hopefully get a new batch expedited ASAP.

Apologies for the delay!

Marrold

[Jan Szumiec]

Customs?

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[Marrold]

It's possible I guess although it will be the first time it's happened. If it is the case a letter from customs would of been nice...

[Hawrylyshen, Alan]

Non compliance with local spectrum regulations? (Lack of markings?) Also an (unlikely) option. I'm very curious to hear what they root cause ends up being.

Alan

M0WTH

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a l a n a t p o l y p h a s e d o t c a

[Jan Szumiec]

I don't think customs would be able to evaluate whether a particular product is not in line with regulations. What'd you put down as the value of the package?

[Hawrylyshen, Alan]

Jan; I agree. However they can see if the package says : RF or Radio and does not have conformance markings...

This is a less likely scenario.

Alan

[Marrold]

Ali Express handled the shipping. So I assume they were somewhat liberal with the truth, probably 'Misc Electronics: $5'

[Marrold]

Hi All,

The modules arrived today just over a week after they were re-shipped. It's amazing how quickly things can arrive from China after the initial shipment has failed...

I will throw one together as a reference, sort out some documentation and sort out the parts hopefully this week and then we can schedule in a build-a-thon.

Cheers!

[Alan Hawrylyshen]

Cool! Glad to see it sorted. Was there any reason given?
A

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[Marrold]

The original shipment got returned to sender, and the seller was unsure why (Or didn't want to tell me why).

The customs declaration was accurate on this batch, perhaps it wasn't on the first attempt.

Cheers

[Samuel Keating-Fry]

Fantastic! Are people about this weekend?

On 14 August 2017 at 21:05, Marrold <Mat...@marrold.co.uk> wrote:
> The original shipment got returned to sender, and the seller was unsure why
> (Or didn't want to tell me why).
>
> The customs declaration was accurate on this batch, perhaps it wasn't on the
> first attempt.
>
> Cheers
>
> On Monday, August 14, 2017 at 8:56:33 PM UTC+1, Alan Hawrylyshen wrote:
>>
>> Cool! Glad to see it sorted. Was there any reason given?
>> A
>> On Mon, 14 Aug 2017 at 20:54, Marrold <Mat...@marrold.co.uk> wrote:
>>>
>>> Hi All,
>>>
>>> The modules arrived today just over a week after they were re-shipped.
>>> It's amazing how quickly things can arrive from China after the initial
>>> shipment has failed...
>>>
>>>
>>> I will throw one together as a reference, sort out some documentation and
>>> sort out the parts hopefully this week and then we can schedule in a
>>> build-a-thon.
>>>
>>>
>>> Cheers!
>>>
>>>
>>>
>>>

[Marrold]

I'm not around this weekend unfortunately. How does Saturday the 26th look for people?

I could always do a week day evening depending on how many people can make it - if there's too many people sharing the irons / hot air it will take most of the evening.

Cheers

[Bill Darvill]

Hi Matthew

Any news on the spares situation yet please?

Regards

Bill

2E0FEI

[Marrold]

Hi all,

When are we doing this? My availability-

• Any weekday evening for the foreseeable future. 
  
• 16/17th September (Sat / Sun)
  
• 24th September (Sun)
  

If it becomes a huge pain to schedule something in, I can knock up some kits and instructions and distribute them if required. 

P.S I've replied to Bill off-list

Cheers!

[Samuel Keating-Fry]

Hi,

Yes, I suspect it may get a bit complicated!

I'm available 24th, but not 16/17th

Thanks,

Sam M0SKF

[Marrold]

Anyone free this weekend? 

[Bill Burman]

I could probably do Saturday...

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[Marrold]

Ok so I have enough components for 7 complete hotspots and 7 people expressed an interest-

JJ

Jan

Mat Stace

Sam

Myself

The Shack

Bill

I've not heard from some of you in a while, if you're still interested but arent able to to make it in the foreseeable, please let me know.

Cheers

[Marrold]

Bill - Doesn't look like other people are free this weekend so I think we will have to postpone.

The next radio meeting (1st weekend of the month) is looking likely

[JJ (g6vzm)]

This Saturday is the only one I'll be in the UK until our next meet so a bit busy, but still interested.  Let me know details if you need money.

JJ

[Marrold]

I'll bring the bits in on Saturday for people to purchase / put together.

If you're bringing your own Raspberry / Orange Pi please could you download the appropriate image and stick it on an SD Card in advance? You can grab them from http://www.pistar.uk/downloads/

Total cost is £33 which also includes a contribution for a hotspot to live in the shack. I'd prefer reimbursement via Bank Transfer, Paypal or monzo.me.


ADF7021 RF Module - £15.76
14.7456MHz TCXO - £2.48

STM32 'Blue Pill' MCU - £3.00

1x PCB - £3.00ish (?)
4x Blue LEDs - £0.66
1x Red LED - £0.27
1x Green LED - £0.27
1x Orange LED - £0.27

1x 7+7 Header - £1.20
2x 20 Pin Headers - £0.30

11x Right Angle Headers - £0.15

Sundries - £1.00 (Solder paste, Resistors etc)

Cheers

Matthew

[Marrold]

Does anyone have a D-Star, Fusion or P25 handheld we can test with for curiosities sake? 

[Samuel Keating-Fry]

Hi,

Alex and I are in the shack.

M0SKF

[Marrold]

I got my ZUMSpot Libre out to do some testing today and had some USB issues, which were more than likely caused by a wrong resistor value on the Blue Pill Board which is a known issue - https://wiki.stm32duino.com/index.php?title=Blue_Pill#Hardware_installation

I was aware of this issue before but it seemed to work without any issues so I didn't bother replacing the resistor on any of the boards.

If you have one of the ZUMSpot Libre kits and you're having USB issues, I suggest swapping out the resistor. 

If you don't have the tools / skills / components I'm happy to do it FoC, just get in touch and I'll arrange to get it done.

Cheers

Matthew

2E0SIP

[Sam Keating-Fry]

Interesting. What were the symptoms?
I've had mine running without issue for a while now.

Sam M0SKF

>> TL;DR: £50ish Digital Mode Hot Spots, who's in?
>>
>> Cheers
>>
>> Matthew
>> 2E0SIP
>>

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[Marrold]

It would appear in dmesg then disconnect and the serial interface would never show up on /dev

Mine always used to work which is why I never bothered with changing the resistor... until now

Maybe its the heat / the wind has changed direction / this new Pi is more fussy 

[Bill Burman]

Is this something that worked until you went portable? I've seen USB issues that only happened with laptops running on batteries, laptops can be a bit stingy with power levels.