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Astrohat - An open hardware RPi Hat for astronomy equipment

7 months 4 days ago 7 months 4 days ago by El Corazon.
El Corazon
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Astrohat - An open hardware RPi Hat for astronomy equipment #46367

jerry wrote: Anyone able to guess if the hat alone would fit onto a Odroid-N2 without modification?

https://www.hardkernel.com/blog-2/odroid-n2/https://www.hardkernel.com/blog-2/odroid-n2/


Depends on whether the ODroid has the same GPIO pin configuration. If it does, it might.

If push comes to shove, your ODroid will go up in flames and you will finally be able to buy an RPi4 in good conscience..... :)

Atlas Pro AZ-EQ, ASI1600MM-Pro, ASI120MM-S, ES102ED, WO-Z61, Nikon D3300, ASI-EFW, ZWO LRGB,Ha,O3,S2 filter set

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7 months 4 days ago
jerry
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Astrohat - An open hardware RPi Hat for astronomy equipment #46368
Well I actually have both already :)

I find I prefer the Odroid-N2, seems snappier. Much of that is likely due to the eMMC vs SD.

I'm a complete novice with electronics, so this looks similar, but maybe not sufficiently so.


El Corazon wrote:

jerry wrote: Anyone able to guess if the hat alone would fit onto a Odroid-N2 without modification?

https://www.hardkernel.com/blog-2/odroid-n2/https://www.hardkernel.com/blog-2/odroid-n2/


Depends on whether the ODroid has the same GPIO pin configuration. If it does, it might.

If push comes to shove, your ODroid will go up in flames and you will finally be able to buy an RPi4 in good conscience..... :)


120 MM Skywatcher Esprit on Celestron CGEM DX HC: GEM 5.29.7137 MC: 6.50 6.50,
ZWO ASI 224MC or QHY-5L-II-M for guiding,
Nikon Z7 8256 x 5504, 35.9 x 23.9mm 4.34 um pixel size.
1) StellarMate on RPI4
2) Kstars on Odroid-N2 on Ubuntu-mate 20.04 and
3) KStars on Astroberry on RPI3.
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7 months 3 days ago
El Corazon
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Astrohat - An open hardware RPi Hat for astronomy equipment #46369
I leave it to Pierros to decide whether that would work or not. My way of putting together PC components involves switching on the power and then watching closely whether I see smoke or sparks somewhere.
I had a slight wiring mishap a few years ago and as it happened, my wife came into the room as the motherboard was literally sending up smoke signals.
I still have not lived that one down, that is a favorite story of hers whenever the topic of any conversation drifts into computers and electronics.

As for the Odroid being snappier, I think you have put your finger on the money. It's the eMMC that makes all the difference. I am booting my Pi4 off an SSD and the difference between that and booting from an SD card is also pretty stunning.

Atlas Pro AZ-EQ, ASI1600MM-Pro, ASI120MM-S, ES102ED, WO-Z61, Nikon D3300, ASI-EFW, ZWO LRGB,Ha,O3,S2 filter set

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7 months 3 days ago
ppapadeas
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Astrohat - An open hardware RPi Hat for astronomy equipment #46371

El Corazon wrote: I would suggest including a ground and a +5V pin on the BOTTOM of the board, to allow for the direct connection of the tower cooling fan (without having to run the wires around the HAT board and connect them to the pins on top).


Noted! I am all for leaving extra ports for things that might be useful in the future ;) Although I think that the cooling tower is a bit of an overkill as others said (due to latest developments on firmware and target environments). I will be adding a port of 5V+ and GND with a simple JST-XH connector just in case though ;)

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7 months 3 days ago
ppapadeas
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Astrohat - An open hardware RPi Hat for astronomy equipment #46372

Robomort wrote: Active cooling is probably not required.
locking or latched DC connectors would be icing on the cake


Please send links to any suggested ones! Would love to get some input on viable replacements for 5.5x2.1 DC plugs (while possibly retaining backwards compat?)

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7 months 3 days ago
ppapadeas
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Astrohat - An open hardware RPi Hat for astronomy equipment #46373

jerry wrote: Well I actually have both already :)
I'm a complete novice with electronics, so this looks similar, but maybe not sufficiently so.


Electrically speaking they seem compatible. I wouldn't be worried about the signal levels and GND positions too much, but rather be extremely worried about the software side of things and how we can access this "Extra" functionality we are asking from pins.

I am really pushing the envelope with RPi4 alternative functions on pins and trying to squeeze out as much functionality as possible, such as i2C, 2x SPI, Serial TTL, many GPIOs and PWMs.. so yeah, it would have to involve some testing to verify compatibility, but it will not elect a new pope in the process of doing so ;)
The following user(s) said Thank You jerry

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7 months 3 days ago
kookoo_gr
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Astrohat - An open hardware RPi Hat for astronomy equipment #46375
My 2 cents, i would prefer if one or a few of the 12v output ports could be adjusted from 5 to 15V. I power my equipment from a deep cycle battery and in order for my mount not to have the blinking LED which means it doesn't have sufficient voltage, and it affects guiding, and for my camera to perform with no issues i power my equipment with 13,5V. I still haven't see this feature in any power box which means i have to power the power box with 13,5v and then distribute those 13,5v via the power box to my equipment for proper functionality.

HEQ5 Pro Rowan Belt Mod, GSO RC8'', SW ED80, Atik 383L+, Atik EFW2, Atik OAG, SX Lodestar, ZWO ASI 120MC

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7 months 3 days ago
El Corazon
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Astrohat - An open hardware RPi Hat for astronomy equipment #46378

ppapadeas wrote:

El Corazon wrote: I would suggest including a ground and a +5V pin on the BOTTOM of the board, to allow for the direct connection of the tower cooling fan (without having to run the wires around the HAT board and connect them to the pins on top).


Noted! I am all for leaving extra ports for things that might be useful in the future ;) Although I think that the cooling tower is a bit of an overkill as others said (due to latest developments on firmware and target environments). I will be adding a port of 5V+ and GND with a simple JST-XH connector just in case though ;)


With respect to target environment: the nights in Texas can be pretty toasty in summer - upwards of 30 degrees C.

Even with that cooling tower, the Pi4 will get pretty hot around here. It shut down on me a few times due to overheating even this late in summer before I had the tower.
As for the firmware making the Pi4 more efficient: will that work on the Pi running Ubuntu?

Atlas Pro AZ-EQ, ASI1600MM-Pro, ASI120MM-S, ES102ED, WO-Z61, Nikon D3300, ASI-EFW, ZWO LRGB,Ha,O3,S2 filter set

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7 months 3 days ago
knro
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Astrohat - An open hardware RPi Hat for astronomy equipment #46379

El Corazon wrote:

ppapadeas wrote:

El Corazon wrote: I would suggest including a ground and a +5V pin on the BOTTOM of the board, to allow for the direct connection of the tower cooling fan (without having to run the wires around the HAT board and connect them to the pins on top).


Noted! I am all for leaving extra ports for things that might be useful in the future ;) Although I think that the cooling tower is a bit of an overkill as others said (due to latest developments on firmware and target environments). I will be adding a port of 5V+ and GND with a simple JST-XH connector just in case though ;)


With respect to target environment: the nights in Texas can be pretty toasty in summer - upwards of 30 degrees C.

Even with that cooling tower, the Pi4 will get pretty hot around here. It shut down on me a few times due to overheating even this late in summer before I had the tower.
As for the firmware making the Pi4 more efficient: will that work on the Pi running Ubuntu?


That's an excellent point. Here it can reach 45C in the summer at night, so active cooling for RPI4 is absolutely necessary.

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7 months 3 days ago
ppapadeas
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Astrohat - An open hardware RPi Hat for astronomy equipment #46380

kookoo_gr wrote: My 2 cents, i would prefer if one or a few of the 12v output ports could be adjusted from 5 to 15V. I power my equipment from a deep cycle battery and in order for my mount not to have the blinking LED which means it doesn't have sufficient voltage, and it affects guiding, and for my camera to perform with no issues i power my equipment with 13,5V. I still haven't see this feature in any power box which means i have to power the power box with 13,5v and then distribute those 13,5v via the power box to my equipment for proper functionality.


Some clarifications. The design as it is right now will supply to the channels whatever is supplied as VIN. Another 2 channels (Dew heaters) are PWM adjusted and 1 channel is LDO adjusted to 6-(VIN-something small). VIN in theory can be up to 16V, although I should probably protect the circuit at around 14.8-15V. Having an adjustable output that can go beyond the VIN would require a buck-boost circuitry that complicates the design at this point. If this is deemed critical, I would be happy to take a pass though.

This is a diagram to make it easier for people to see the main features:


As for active cooling I hope that the 5V port would be OK for a fan, but we really need to think about the fan placement. Having the boards at hand will help with that :)
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7 months 3 days ago
Robomort
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Astrohat - An open hardware RPi Hat for astronomy equipment #46384
Explaining computers did a quick test last week.
.
I would say however the second device where the heatsinks sandwich the board is a bit of a designers wet dream since the lower half is the most expansive but is not really thermally connected to the board only at the screw lugs to the top.
I prefer the Kodi branded unit since it performed better and totally enclosed the board.
Neither of course are suitable for a two layer stack but give insight into what works best. Use that knowledge to find other similar but taller solutions which no doubt will be available now or in the near future.
Personally I am using the Rock Pi 4 running a DIY Stellarmate install. They have a solution to house their board and an second layer and SSD. Rock Pi 4 sensibly placed the SOC on the bottom of their board making heatsinking much easier.

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7 months 3 days ago 7 months 3 days ago by Robomort.
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Astrohat - An open hardware RPi Hat for astronomy equipment #46386
never mind I looked closer at the features and you have my request covered

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