×
INDI Library v1.8.6 Released (21 Aug 2020)

August 2020 release of INDI Library v1.8.6 introduces new drivers while providing fixes and improvements to existing devices and core framework.

My shopping list for my notional Pi 4 SM gadget

8 months 4 weeks ago
fewayne
Expert Boarder
Expert Boarder
Posts: 84
More
Topic Author
My shopping list for my notional Pi 4 SM gadget #47504
I've got a Pi 3-based StellarMate gadget running my scope currently. Since Jasem and company seem to have gotten the early bugs ironed out of the Pi 4 version, I'm planning to upgrade. In particular, I'd love to have plate solving work reliably on the Pi side instead of having to use my Mac; along with the fuss/bother/limited Mac battery in the cold, downloading the images from the INDI server on the Pi to Ekos on the Mac takes almost a minute.

For general performance as well as never having to worry about disk space, I'm going to use a USB 3 SSD. External, so I don't have to add an interface board, as well as high-speed direct USB-3 transfer to other machines for processing. I'm using a DockerPi PowerBoard to give the Pi its 5V off my standard 12V barrel-connector wiring harness; that also lets me run 12V from the Pi case right to the ASI183MMPro's cooler (and to my someday autofocuser).

Pi 4b 4 GB, $55.00

DockerPi PowerBoard, $18.99
ADATA SD600Q 240GB USB 3.2 3D NAND External Solid State Drive - Newegg.com, $44.99
HighPi Raspberry Pi Case for Pi4, Black - PiShop.us, $9.95
TOTAL, $128.93



Whaddya think? Any suggestions?

(Cross-posted to Cloudy Nights)

Please Log in or Create an account to join the conversation.

9 months 2 hours ago
knro
Administrator
Administrator
Posts: 8398
Karma: 51
My shopping list for my notional Pi 4 SM gadget #47523
That looks goods to me except I never tried SSD booting with the Pi before.

Jasem Mutlaq
Support INDI & Ekos; Get StellarMate Astrophotography Gadget.
How to Submit Logs when you have problems?
Add your observatory info

Please Log in or Create an account to join the conversation.

8 months 4 weeks ago
fewayne
Expert Boarder
Expert Boarder
Posts: 84
More
Topic Author
My shopping list for my notional Pi 4 SM gadget #47530
Thanks Jasem! I'm not planning to boot off the SSD, I'll just use the MicroSD like everybody else. I'm just going to use it for storage, both for speed and so that I can transfer data merely by unplugging it and plugging it into the machine I use for processing.

Kevin on CN says that instead of the DockerPi board, he used a stepper-motor HAT, which also inputs 12V and runs the Pi off 5, but in addition of course it can run a stepper for autofocusing. So I'm probably going to do that instead, I built a myFocuserPro2 board but for some reason it won't drive the motor; having everything nicely integrated into the case with the Pi means fewer boxes and at least one fewer cable. May have to add a separate fan though.

Heh. I see a market opportunity for you here, Jasem -- the autofocus-capable StellarMate Advanced gadget.

Please Log in or Create an account to join the conversation.

8 months 4 weeks ago
Ihoujin
Platinum Boarder
Platinum Boarder
Posts: 921
Karma: 3
More
My shopping list for my notional Pi 4 SM gadget #47541
I'm afraid not. I have both versions of The Adafruit Motor HAT I believe you are talking about. It does not regulate the input power, so it can not supply 5V to the Pi. What it does is receive 5V power for the logic side via the GPIO pins, and the motor power has its own external supply supply point. Therefore you would have to add additional power regulation circuitry to a powersource that may be noisy due to running motors.
Also the stepper motor driving performance is limited due to the I2C bus frequency. That can partially be worked around by raising it in the boot/config.txt file, but that will be problematic if you need microstepping at reasonable speed, plus it is not compatible with the frequencies that real time clock modules can use.
So for that reason I recommend looking for a stepper driver board and INDI Driver that uses GPIO PWM signals rather than I2C. I would suggest trying the Pololu A4988.

INDI/KStars on Raspberry Pi 4, 4gb
Raspbian Buster with AstroPi3 script configuration
Skywatcher HEQ5 Pro Mount
Canon 600D Camera
Orion SSAG/ASI120mm @280mm Guide Scope
PHD2
Adafruit Motor Hat shield
Adafruit GPS Module
Generic Bluetooth Joystick.
Startech 7 port powered USB Hub.

Please Log in or Create an account to join the conversation.

8 months 4 weeks ago
fewayne
Expert Boarder
Expert Boarder
Posts: 84
More
Topic Author
My shopping list for my notional Pi 4 SM gadget #47548
The stepper HAT in question is the Waveshare, BTW.

Please Log in or Create an account to join the conversation.

8 months 4 weeks ago 8 months 4 weeks ago by sywong2000.
sywong2000
Senior Boarder
Senior Boarder
Posts: 60
More
My shopping list for my notional Pi 4 SM gadget #47550
If the SSD is just for the storage why don't you consider a USB3 thumb drive? just suggesting ;)

Please Log in or Create an account to join the conversation.

8 months 4 weeks ago
Ihoujin
Platinum Boarder
Platinum Boarder
Posts: 921
Karma: 3
More
My shopping list for my notional Pi 4 SM gadget #47551
Waveshare board looks good, I'm surprised I never came by it while researching for my own DIY focuser.

INDI/KStars on Raspberry Pi 4, 4gb
Raspbian Buster with AstroPi3 script configuration
Skywatcher HEQ5 Pro Mount
Canon 600D Camera
Orion SSAG/ASI120mm @280mm Guide Scope
PHD2
Adafruit Motor Hat shield
Adafruit GPS Module
Generic Bluetooth Joystick.
Startech 7 port powered USB Hub.

Please Log in or Create an account to join the conversation.

8 months 4 weeks ago
fewayne
Expert Boarder
Expert Boarder
Posts: 84
More
Topic Author
My shopping list for my notional Pi 4 SM gadget #47567
You know, I had assumed that an SSD would be faster, but flash is pretty much flash, isn't it? So long as it's a USB 3 thumb drive plugged into a USB 3 port on the Pi I should be good to go. Thanks, that saved me a few bucks, some cubic centimeters, and some grams on the scope!

Please Log in or Create an account to join the conversation.

8 months 4 weeks ago
AstroNerd
Moderator
Moderator
Posts: 854
Karma: 1
More
My shopping list for my notional Pi 4 SM gadget #47574

fewayne wrote: You know, I had assumed that an SSD would be faster, but flash is pretty much flash, isn't it? So long as it's a USB 3 thumb drive plugged into a USB 3 port on the Pi I should be good to go. Thanks, that saved me a few bucks, some cubic centimeters, and some grams on the scope!


Well, strictly speaking, flash is not just flash, the SSD would be much faster, but for purposes of just saving the images, a USB thumb drive will be more than adequate.. :)
I tried running my RPI4 from an SSD and from a USB 3 thumb drive, and the SSD is far faster, than the thumb drive, but the thumb drive only a little faster than the SD card...

Stellarmate OS on Raspberry pi4b
Skywatcher EQ8 pro, on steel pier
Takahashi FSQ85 & Meade 8” SCT (de-forked)
Starlight Xpress SXVR H18, SXVR M25c, Lodestar x2 Guide Camera
Pegasus Ultimate Hub V2 for all USB & Power
Pegasus focus motors on both scopes

Please Log in or Create an account to join the conversation.

8 months 4 weeks ago
Ihoujin
Platinum Boarder
Platinum Boarder
Posts: 921
Karma: 3
More
My shopping list for my notional Pi 4 SM gadget #47576
If you are looking for speed and reliability, the form of memory and cache of an SSD will greatly out perform a memory stick.

INDI/KStars on Raspberry Pi 4, 4gb
Raspbian Buster with AstroPi3 script configuration
Skywatcher HEQ5 Pro Mount
Canon 600D Camera
Orion SSAG/ASI120mm @280mm Guide Scope
PHD2
Adafruit Motor Hat shield
Adafruit GPS Module
Generic Bluetooth Joystick.
Startech 7 port powered USB Hub.

Please Log in or Create an account to join the conversation.

8 months 4 weeks ago
hy
Gold Boarder
Gold Boarder
Posts: 325
Karma: 3
More
My shopping list for my notional Pi 4 SM gadget #47592
FWIW, I use a fast USB stick ( www.amazon.com/gp/product/B01MU8TZRV/ref...02_s00?ie=UTF8&psc=1 ) on my RPi4, of course on the usb3 port, and capture directly to the stick. In the morning, I walk the stick over to my Mac, plug it in there, and backup my images. This seems to be fast-enough (takes a second or two to write an ASI1600mm image). I've never tried an SSD (though I plan to), but this approach was a big improvement over writing to the SDCard, then copying from the SDCard to a usb , ...

Can I also walk the SSD over to the mac? That sneaker-net approach works great!

Please Log in or Create an account to join the conversation.

Time to create page: 0.377 seconds