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by rubenhak
Mon Aug 24, 2020 12:53 am
Forum: HATs and other add-ons
Topic: Charger for Raspberry PI 4B
Replies: 22
Views: 1324

Re: Charger for Raspberry PI 4B

First of all you need to check how long you want to use this camera and measure the used current of you application. Then you can select the correct battery and the extra required hardware. For example if your Rpi used 2A (some random number) and you camara and LCD use 1.4A, then you cannot use tho...
by rubenhak
Sat Aug 22, 2020 9:48 pm
Forum: HATs and other add-ons
Topic: Charger for Raspberry PI 4B
Replies: 22
Views: 1324

Re: Charger for Raspberry PI 4B

As an alternative approach I'm thinking about getting a 3A power bank. The problem is that the ones that output 3A are pretty big and support 2 port outputs, which is an overkill. Would it be possible to open it up and replace the battery to smaller one? Something like this: https://www.aliexpress.c...
by rubenhak
Sat Aug 22, 2020 9:45 pm
Forum: HATs and other add-ons
Topic: Charger for Raspberry PI 4B
Replies: 22
Views: 1324

Re: Charger for Raspberry PI 4B

Imperf3kt wrote:
Tue Aug 18, 2020 9:29 pm
That boost regulator is pretty good, but note that is has a minimum voltage difference of 1.5v (output must be 1.5v higher than input at minimum)
Where did you find that requirement. Can't see that anywhere in the description.
by rubenhak
Tue Aug 18, 2020 10:49 pm
Forum: HATs and other add-ons
Topic: Charger for Raspberry PI 4B
Replies: 22
Views: 1324

Re: Charger for Raspberry PI 4B

oh, this so much more complex than i though. Am I the only one that tries to run RPi 4 from battery? :D ok, then i would pair charger: https://www.amazon.com/Makerfocus-Charging-Lithium-Battery-Protection/dp/B071RG4YWM with protection circuit: https://www.amazon.com/Anmbest-Cargador-bater%C3%ADa-bat...
by rubenhak
Tue Aug 18, 2020 5:08 am
Forum: HATs and other add-ons
Topic: Charger for Raspberry PI 4B
Replies: 22
Views: 1324

Re: Charger for Raspberry PI 4B

found another one: https://www.amazon.com/ARCELI-Converter-Voltage-Adjustable-Step-up/dp/B07BVWV74J Found this circuit for charging and protection: https://www.amazon.com/Anmbest-Cargador-bater%C3%ADa-bater%C3%ADas-unidades/dp/B07KSPYMJ2 So the charge/discharge should be wired to charge port as well...
by rubenhak
Mon Aug 17, 2020 8:56 am
Forum: HATs and other add-ons
Topic: Charger for Raspberry PI 4B
Replies: 22
Views: 1324

Re: Charger for Raspberry PI 4B

Before starting to think about charging, test whether your tiny lipo is capable for the job. As imperfect stated, no rating is 1C or less. In 0.5C case it can only provide 2*0.5=1A, definitely too low for Pi4B. Even with 1C it can deliver only 2A, which is guaranteed to show undervoltage symbol on ...
by rubenhak
Mon Aug 17, 2020 3:28 am
Forum: HATs and other add-ons
Topic: Charger for Raspberry PI 4B
Replies: 22
Views: 1324

Re: Charger for Raspberry PI 4B

Imperf3kt wrote:
Mon Aug 17, 2020 2:11 am
Never assume a lipo is more than 1C unless stated. It's not uncommon for a small lipo to be 0.5C
Understood. Lets say i get an appropriate battery, what's the best way to do charing and boosting?
by rubenhak
Mon Aug 17, 2020 1:38 am
Forum: HATs and other add-ons
Topic: Charger for Raspberry PI 4B
Replies: 22
Views: 1324

Re: Charger for Raspberry PI 4B

What is the C rating of your 1S lipo? If 2*C > amperage needed, then that lipo is fine. You need to use converter to get 3.3V or 5V from 1S lipo (3.7..4.2V), and it needs to be capable of 3A at least for Pi4B. Its hard to tell. Description doesn't mention the C rating. Wouldn't it bee at least 2? h...
by rubenhak
Sun Aug 16, 2020 8:00 pm
Forum: HATs and other add-ons
Topic: Charger for Raspberry PI 4B
Replies: 22
Views: 1324

Re: Charger for Raspberry PI 4B

Can i use 2 individual circuits for charging and boosting? For example a 1A charger like this: https://www.amazon.com/Makerfocus-Charging-Lithium-Battery-Protection/dp/B071RG4YWM along with a 3A voltage booster: https://www.aliexpress.com/item/33004374185.html What would be the best way to prevent t...
by rubenhak
Sun Aug 16, 2020 7:53 pm
Forum: HATs and other add-ons
Topic: Charger for Raspberry PI 4B
Replies: 22
Views: 1324

Re: Charger for Raspberry PI 4B

I also have 4/3S batteries, from RC quad/planes. That sounds like an overkill. I already have a 1S 2000mah battery.
I'd like to make a self-contained system which includes a charger.
by rubenhak
Sun Aug 16, 2020 7:41 am
Forum: HATs and other add-ons
Topic: Charger for Raspberry PI 4B
Replies: 22
Views: 1324

Charger for Raspberry PI 4B

hi Guys, I'm trying to run RPI 4B + 4" LCD + FliR lepton thermal camera off a battery. Also want the board to be able to charge the battery. Got the adafruit PowerBoost 1000 board, but then realized that it is rated to 1A only. Looks like I would need some other way of boosting the power from 3...
by rubenhak
Sun Aug 16, 2020 7:20 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Rotating screen & enabling touch + second SPI device
Replies: 0
Views: 167

Rotating screen & enabling touch + second SPI device

Hi Folks, I'm using Raspberry PI 4 B with Miuzei Raspberry Pi 4 Touchscreen ( https://www.amazon.com/gp/product/B07XBVF1C9 ). Having two issues: 1. screen is rotated as portrait. 2. touch screen not working out of the box. To fix those i tried installing: https://github.com/goodtft/LCD-show and exec...
by rubenhak
Thu Aug 13, 2020 7:51 am
Forum: Troubleshooting
Topic: No /dev/spidev* despite loaded modules [solved]
Replies: 12
Views: 5844

Re: No /dev/spidev* despite loaded modules [solved]

I'm having the same problems. Trying to run an SPI device along with the LCD touch screen. $ ls -la /sys/bus/spi/devices/spi0.1/ total 0 drwxr-xr-x 6 root root 0 Aug 13 00:44 . drwxr-xr-x 5 root root 0 Aug 13 00:44 .. -rw-rw-r-- 1 root root 4096 Aug 13 00:48 disable lrwxrwxrwx 1 root root 0 Aug 13 0...
by rubenhak
Mon Feb 09, 2015 11:10 pm
Forum: Graphics, sound and multimedia
Topic: VIdeo Capture
Replies: 12
Views: 40430

Re: VIdeo Capture

I haven't seen a compatible hdmi capturer for the raspberry pi so far, but the company Auvidea are planning to release a HAT (hardware attached on top) for the model B from what I can see on their photos - http://www.auvidea.com/index.php/theme-styles/2013-06-22-21-23-34/raspberry-pi-hdmi-in Otherw...
by rubenhak
Mon Feb 09, 2015 11:07 pm
Forum: Graphics, sound and multimedia
Topic: VIdeo Capture
Replies: 12
Views: 40430

Re: VIdeo Capture

Defiant wrote:The Pis broken USB cannot handle the easycap, just search the forum for it.
Could you elaborate more on this? I've came across this thread and looks like the author managed to use the easycap with RPi.
http://www.raspberrypi.org/forums/viewt ... 47#p690047
by rubenhak
Mon Feb 09, 2015 8:44 pm
Forum: Troubleshooting
Topic: Easycap has no color
Replies: 4
Views: 4641

Re: Easycap has no color

hi,

Did you have any performance issues with the USB port on the RPi when using the easycap?

Thanks,
Ruben
by rubenhak
Mon Feb 09, 2015 6:14 am
Forum: Graphics, sound and multimedia
Topic: VIdeo Capture
Replies: 12
Views: 40430

VIdeo Capture

Hi Everybody, I'm new to raspberry pi programming. Trying to implement a project. Is it possible to capture video (analog or better an hdmi) signal and perform some processing over the video? Basically get an access to raw frame buffer? Came across this USB capture device. Is it compatible with Rasp...

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