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Power Shield for Astroberry

3 months 2 weeks ago
mlarsson
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Power Shield for Astroberry #61186
Hi!

To the best of my knowlegde, the Anderson Powerpole connectors are very common among astro people - replacing the "cigarette lighter" connectors. And I'm talking about these:

andersonconnect.com.au/store/index.php?m..._info&products_id=93

A lot of people for instance use a "Rig runner" on top of their mounts to distribute power to all the devices - based on these. For instance:

www.westmountainradio.com/product_info.php?products_id=rr_4006u

The device your are designing is effectively a far more advanced version of a RigRunner (sort of).

Magnus


Celestron C8, Skywatcher 100 ED Pro
Losmandy G11
Atik 383L+, ASI294

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3 months 2 weeks ago
jabian
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Power Shield for Astroberry #61198
They are very common in ham radio. There are racks for power distribution, very popular, some with fuses. Some models can stand very high currents.

Celestron AVX
Celestron SCT 8” Edge HD, Primaluce ESATTO
TS Optics Photoline 80mm f/6 FPL53 Triplet-Apo, Primaluce SESTO SENSO 2
Celestron OAG, Lodestar X2 guide
Pegasus PowerBox Advanced
Stellarmate Gadget
AstroPhotography Tool (APT)
Nikon D90

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3 months 2 weeks ago 3 months 2 weeks ago by Deesk06.
Deesk06
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Power Shield for Astroberry #61200
I like the original design OP has. Powerpole connectors are great but seems like it would take up more real estate on the hub itself. Those connections are somewhat wide. The 2.1mm connection seems better IMO with the reverse polarity protection

Mount: Skywatcher HEQ5 Pro | Main Scope: William Optics GT81 | Guide Scope: ZWO OAG | Imaging Camera: ZWO ASI183MM Pro | Guiding Camera: ASI120MM-Mini | Accessories: ZWO EAF, ZWO EFW 8 x 1.25", Pegasus Pocket Powerbox advance, RPi4

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3 months 2 weeks ago
picciux
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Power Shield for Astroberry #61232
Hi tikiss and all,
very good work, I'm interested in one maybe two machine-populated units.
Just some notes:
  1. ATM 4 GPIO left unused. If GPS reset is not used and 3Dfix led can be sacrificed, we could have 6 gpios to let the unit control focuser stepper motors using already available Radeck Astroberry Focuser indi driver. On the power shield side, only a JST like connector to link one of those mini stepper controller modules is needed.
  2. MCP3202 can be replaced with 3208, and populating 1 INA328 and OP-AMP per channel we'll have amps readings per-device instead of total. Maybe it's an overikill, don't know.
  3. the OneWire pin can be used to chain one or two DS18B20 temperature sensors to monitor stuff that has to be kept dew-free: since ambient temperature and relative humidity are already avavilable, we can calculate dew point temperature and automatically regulate heaters at minimum power needed to keep dew away. Obviously lacking (or not working) the sensor, the channel works in manual power mode. I've already done it with Arduino, code is simple and I can contribute it.

What do you think about it?

Matteo

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3 months 2 weeks ago
tikiss
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Power Shield for Astroberry #61460

mlarsson wrote: Hi!
And I'm talking about these:
andersonconnect.com.au/store/index.php?m..._info&products_id=93


I have also checked these, but I was mainly focused on which can be used on PCB side, the only disadvantage is the population on the board could be a little bit difficult compared to XT60 which is a solid block together with pins.
I will order a couple of samples to see how it looks.

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3 months 2 weeks ago
tikiss
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Power Shield for Astroberry #61461

jabian wrote: They are very common in ham radio. There are racks for power distribution, very popular, some with fuses. Some models can stand very high currents.

Yes, I have also found on Wikipedia that radio amateurs using it as well.

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3 months 2 weeks ago
tikiss
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Power Shield for Astroberry #61462

Deesk06 wrote: I like the original design OP has. Powerpole connectors are great but seems like it would take up more real estate on the hub itself. Those connections are somewhat wide. The 2.1mm connection seems better IMO with the reverse polarity protection

If I understood the others, they were recommending the PowerPole instead of the XT60 input power connector. I agree with you the normal DC jack (2.1mm or 2.5mm) is better (more common) to use for the outputs.
As far as I understood the PowerPole has also a kind of polarity.

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3 months 2 weeks ago 3 months 2 weeks ago by mlarsson.
mlarsson
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Power Shield for Astroberry #61463
Hi!

I don't have much experience in connecting them to a PCB but there are this type of connectors at least (think there are others as well):

i.ebayimg.com/images/g/ItUAAOSw55FcVvQ9/s-l1600.jpg

Best,

Magnus


Celestron C8, Skywatcher 100 ED Pro
Losmandy G11
Atik 383L+, ASI294

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3 months 2 weeks ago 3 months 2 weeks ago by tikiss.
tikiss
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Power Shield for Astroberry #61464

picciux wrote: ATM 4 GPIO left unused. If GPS reset is not used and 3Dfix led can be sacrificed, we could have 6 gpios to let the unit control focuser stepper motors using already available Radeck Astroberry Focuser indi driver. On the power shield side, only a JST like connector to link one of those mini stepper controller modules is needed.

Yes, I am thinking about how to implement it, I do not really want to have the housing bigger, and currently, the front and back plates are full of connectors, based on my testing during the last week, it seems that I have to remove the onboard BME280, because the RPi temperature is influencing it quite much, so if I do so I would have space for another connector.
Do you think a JST 2,54mm pitch connector would be okay for that? I think an RJ11/12 is more common, or?

MCP3202 can be replaced with 3208 and populating 1 INA328 and OP-AMP per channel we'll have amps readings per-device instead of total. Maybe it's an overkill, don't know.

When I have started that design I have also thought about single-channel current measurement, and I am open to modifying it, with a smart MOSFET so I can also remove the fuses because the smart MOSFETs are overcurrent protected. This could help the place a stepper driver on the board.

the OneWire pin can be used to chain one or two DS18B20 temperature sensors to monitor stuff that has to be kept dew-free: since ambient temperature and relative humidity are already available, we can calculate dew point temperature and automatically regulate heaters at minimum power needed to keep dew away. Obviously lacking (or not working) the sensor, the channel works in manual power mode. I've already done it with Arduino, code is simple and I can contribute it.

As I mentioned previously the onboard BME280 cannot be isolated 100% from the RPi, so I am planning to remove it, and maybe add two 3,5mm jack connectors, one for I2C sensors, like BME280, and one for one-wire sensors. Let's see how all these fits on the board.

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3 months 2 weeks ago
tikiss
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Power Shield for Astroberry #61465
Hi Magnus,

mlarsson wrote: i.ebayimg.com/images/g/ItUAAOSw55FcVvQ9/s-l1600.jpg

Exactly, that is what I have also found in the catalog.
I will order a couple of, to study them.


Tibor

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3 months 2 weeks ago
jiberjaber
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Power Shield for Astroberry #61467
When I built my dew heater control box quite a few years ago I used DS18B20 on each strap to allow me to feed back and control the PWM to teh strap itself. This needed something different to the phono style connectors so I used 4 pin DIN connectors at the time.

I am really interested in this project - I think I would use off-board connectors to allow the above implementation plus that would allow for better weather proofed solution (though not watertight, but if I can avoid condensation getting in to the enclosure that would be good.

Looking forward to see how it progresses... and where I can help if possible.

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3 months 2 weeks ago
gilesco
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Power Shield for Astroberry #61479
I would worry if it tries to emulate the PPB Advance to a tee.

The moonlite focuser interface, for example, is something that I was hopeful to not have - no use for me, can be done via the Pi.

I guess the price point would be the key, whether this is better than a PPB Advance, tied with an Argon One M.2 case... or can take on the PPB Advance, with Pi4 integrated, with a type of Argon One M.2 thepihut.com/products/argon-one-m-2-raspberry-pi-4-case

Let's see where it goes...

__
I blog my progress: www.coochey.net

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