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by ProDigit
Sat Aug 24, 2019 1:16 pm
Forum: HATs and other add-ons
Topic: Stacking a pi on a pi with GPIO?
Replies: 5
Views: 95

Stacking a pi on a pi with GPIO?

Just out of curiosity,
Can one use a Pi zero as a hat for a pi 3B, by connecting both of them together through the gpio pins?
by ProDigit
Sat Aug 24, 2019 11:56 am
Forum: Beginners
Topic: Looking for Pi 3 B+ overclock Settings
Replies: 38
Views: 48539

Re: Looking for Pi 3 B+ overclock Settings

I'll let it throttle at 60C. 60's are reached quite easy without a heatsink, and that means that 70's will be hited with moderate heavy loads. And 70's are not good for SoC's health, IMHO My 3B+ with heat sink runs at 1.4GHz all the time - regardless of how heavy the load is. When the load is large...
by ProDigit
Sat Aug 24, 2019 10:07 am
Forum: Troubleshooting
Topic: RPi 3B+ core frequency change
Replies: 10
Views: 1793

Re: RPi 3B+ core frequency change

In the meantime I have found out, that a clocking parameter named "core_freq_min" exists. I would expect, that setting core_freq_min=400 on a Raspberry Pi 3B+ with core_freq=400 would result in constant I/O speed (UART, SPI, I2C). The question is, whether it is permissible to do that without loosin...
by ProDigit
Sat Aug 24, 2019 4:02 am
Forum: Troubleshooting
Topic: RPi 3 not booting after updates
Replies: 13
Views: 249

Re: RPi 3 not booting after updates

Anyone who can find out how to overclock the Pi, will more than likely have knowledge on how to do it, and the consequences of it. Installing updates, just like running the Pi, on an overclock can be done without issues. Also, concerning to a comment made before, the updating process of the GUI is q...
by ProDigit
Thu Aug 22, 2019 9:38 pm
Forum: Troubleshooting
Topic: RPi 3 not booting after updates
Replies: 13
Views: 249

Re: RPi 3 not booting after updates

It helps with slower pis installing updates quicker. Just a trick to help speed up the installation, not a solution to the problem. Overclocking prior to getting a stable system up and running and backed up is a terrible idea. Not really. As long as it's a stable overclock, it can't harm. It only i...
by ProDigit
Thu Aug 22, 2019 6:24 pm
Forum: Troubleshooting
Topic: Pi zero with Raspbian shows 28% constant CPU usage?
Replies: 10
Views: 236

Re: Pi zero with Raspbian shows 28% constant CPU usage?

Yes, CPU usage increases as the overclock increases. CPU, GPU, and sdram overclock are responsible for up to 10% of CPU usage. The higher the overclock, the higher the CPU usage. At 10% CPU usage, with arm_freq=1050 gpu_freq=550 sdram_freq=600 I get best overclocking results, stable in my tests, but...
by ProDigit
Thu Aug 22, 2019 7:49 am
Forum: Troubleshooting
Topic: Pi zero with Raspbian shows 28% constant CPU usage?
Replies: 10
Views: 236

Re: Pi zero with Raspbian shows 28% constant CPU usage?

After debug there is no folders The /tracing/... folder it doesn't accept You can't access that directory as a normal user, only root can. It probably needs the kernel compiled with tracing enabled, I tested it on mine running Buster and it worked, I don't know if previous versions had it enabled i...
by ProDigit
Thu Aug 22, 2019 2:04 am
Forum: Troubleshooting
Topic: Raspberry Pi zero W, arm_freq_min not working
Replies: 0
Views: 35

Raspberry Pi zero W, arm_freq_min not working

It appears that arm_freq_min (working on my Pi 3B+), is not working on the Pi Zero W.
by ProDigit
Thu Aug 22, 2019 1:01 am
Forum: Troubleshooting
Topic: Pi zero with Raspbian shows 28% constant CPU usage?
Replies: 10
Views: 236

Re: Pi zero with Raspbian shows 28% constant CPU usage?

After debug there is no folders The /tracing/... folder it doesn't accept Gets output 0 Another strange thing I've noticed is that the zero crashes at sdram_freq=575 and sdram_over_voltage=1, but succeeds to boot and operate at sd_freq=600 with sdram_over_voltage=1. Not sure if this is related. The ...
by ProDigit
Thu Aug 22, 2019 12:45 am
Forum: Troubleshooting
Topic: RPi 3 not booting after updates
Replies: 13
Views: 249

Re: RPi 3 not booting after updates

It helps with slower pis installing updates quicker. Just a trick to help speed up the installation, not a solution to the problem.
The title says it's a Pi3, so I presume Pi 3a+ or B model (non B+).

Perhaps boot sector wasn't the right wording, should be boot files.
by ProDigit
Thu Aug 22, 2019 12:10 am
Forum: Troubleshooting
Topic: Pi zero with Raspbian shows 28% constant CPU usage?
Replies: 10
Views: 236

Re: Pi zero with Raspbian shows 28% constant CPU usage?

How is the screen connected? HDMI? GPIO hat. I checked this thread , but the wifi doesn't seem to be the cause... I tried sudo -s echo 1 > /proc/sysrq-trigger without success... Nothing displays. Update: I set core_freq=500 , and CPU usage went back to 28%. This with over_voltage set to 3. I tried ...
by ProDigit
Wed Aug 21, 2019 11:45 pm
Forum: Troubleshooting
Topic: Pi zero with Raspbian shows 28% constant CPU usage?
Replies: 10
Views: 236

Re: Pi zero with Raspbian shows 28% constant CPU usage?

It's a 480x320p screen, running at 720*480p resolution (hardware scaled), for compatibility with my external HDMI monitor (when needed). No containers I removed the overclocking options, rebooted, and still the same. I saw I forgot to remove the over_voltage settings; it was running stock speeds at ...
by ProDigit
Wed Aug 21, 2019 10:57 pm
Forum: Troubleshooting
Topic: RPi 3 not booting after updates
Replies: 13
Views: 249

Re: RPi 3 not booting after updates

Probably an error in the boot sector. My recommendation is to write the image, do the preliminary install, no updates, and then reconfigure the VRAM (personally I set it to 32MB, as I don't need more), and finally do the overclocking in /boot/config.txt. Then reboot, and after reboot, use apt to upd...
by ProDigit
Wed Aug 21, 2019 10:40 pm
Forum: Troubleshooting
Topic: Pi zero with Raspbian shows 28% constant CPU usage?
Replies: 10
Views: 236

Pi zero with Raspbian shows 28% constant CPU usage?

I see a constant 28% CPU usage in the CPU usage monitor applet on the taskbar. Before it would hover between 0 and 2% when inactive. Probably on a stock (non-overclocked Pi Zero, it might show closer to 30% CPU usage). I tried taskmanager (CTRL + ALT + DEL, or lxtask), or htop, even tried sudo lxtas...
by ProDigit
Wed Aug 21, 2019 12:35 pm
Forum: Troubleshooting
Topic: Permanently disable swap on Raspbian Buster
Replies: 68
Views: 2227

Re: Permanently disable swap on Raspbian Buster

You have a rather odd way of doing things. If you want bare bones either get a stripped tiny OS or just start with Raspbian Lite and add only the cmdline apps you absolutely need. Starting with a distro with X and a desktop and trying to strip it out without breaking stuff is a total pita. If you a...
by ProDigit
Wed Aug 21, 2019 3:10 am
Forum: Advanced users
Topic: UPDATED: Overclocking pi zero W
Replies: 5
Views: 530

Re: Overclocking pi zero

Ok, the hat needs 32MB of Vram,

Anyone experiences Overclocking instability with hats?
It appears my overclock is lower, despite higher overvolt settings.
by ProDigit
Tue Aug 20, 2019 11:32 pm
Forum: General discussion
Topic: 12 v for driving electromagnets PCA9685
Replies: 31
Views: 632

Re: 12 v for driving electromagnets PCA9685

I don't know if it's a good idea to just let that current go to ground, without any load on?
Maybe a small resistor in series with the Diode?
by ProDigit
Tue Aug 20, 2019 10:54 pm
Forum: General discussion
Topic: 12 v for driving electromagnets PCA9685
Replies: 31
Views: 632

Re: 12 v for driving electromagnets PCA9685

Why would you put a diode between the ground and line wire?
Even if it's only operating at 12V, if it ever gets to a certain voltage, the diode will short the circuit.

Also make sure you have the base, collector and emitter connected correctly.
by ProDigit
Tue Aug 20, 2019 10:44 pm
Forum: Troubleshooting
Topic: Permanently disable swap on Raspbian Buster
Replies: 68
Views: 2227

Re: Permanently disable swap on Raspbian Buster

Uninstalling most programs will save a bit of space on the main storage device, but won't make any difference to RAM or CPU usage. Sometimes it does. in Windows, and Android, doing this will reduce registry entries, so for instance file associations are removed. removed App or program notifications...
by ProDigit
Tue Aug 20, 2019 9:32 pm
Forum: Troubleshooting
Topic: Permanently disable swap on Raspbian Buster
Replies: 68
Views: 2227

Re: Permanently disable swap on Raspbian Buster

I'm just used to optimize the system to the hardware. Minimize ram usage, by using a plain background, minimalistic theme, and uninstall most programs I'd never use or need. Also, the Pi3 for me isn't really to open a lot of tabs; I would open 2 to 3 tabs at most, and mostly sites that provide updat...
by ProDigit
Tue Aug 20, 2019 3:03 pm
Forum: Advanced users
Topic: UPDATED: Overclocking pi zero W
Replies: 5
Views: 530

Re: Overclocking pi zero

I'm actually going to pair the zero with one of those GPIO screens, and a 480p resolution (has 320p resolution, but shows 480p quite fine), as a spare system for coding. The resolution makes 16MB of Vram more than enough, freeing up more RAM memory. Since it can't really display video anyway (YouTub...
by ProDigit
Tue Aug 20, 2019 12:53 am
Forum: Advanced users
Topic: Overclock Pi 3B+
Replies: 0
Views: 105

Overclock Pi 3B+

Just for my own reference, They're mild overclocking settings (lines entered into /boot/config.txt), that also will make the pi run cooler at idle. Pi 3B+ with GPIO screen hat, and case, 3 passive heat sinks on the top, and 1 on the bottom: arm_freq=1495 arm_freq_min=450 gpu_freq=515 gpu_freq_min=20...
by ProDigit
Tue Aug 20, 2019 12:23 am
Forum: General discussion
Topic: 12 v for driving electromagnets PCA9685
Replies: 31
Views: 632

Re: 12 v for driving electromagnets PCA9685

There are plenty of regular (bipolar) transistors that can handle 12-60V, 500-10.000mA devices. You just need to select the most appropriate option for your purposes.
by ProDigit
Mon Aug 19, 2019 10:22 pm
Forum: General discussion
Topic: 12 v for driving electromagnets PCA9685
Replies: 31
Views: 632

Re: 12 v for driving electromagnets PCA9685

You'll have to use the Pi to drive the gate on a transistor.
The transistor in it's turn, will drive whatever else you've plugged in it.
by ProDigit
Mon Aug 19, 2019 9:49 pm
Forum: General discussion
Topic: Rasbary pi screen
Replies: 11
Views: 420

Re: Rasbary pi screen

Newegg is safe. Been a customer with them for nearly 15 years. They're like amazon, only nowadays they're a bit behind. However, why not go for a display that directly feeds off the GPIO pins, like this one?: With buttons and case: https://www.amazon.com/Raspberry-3-5inch-Screen-480x320-Console/dp/B...

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