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by mahjongg
Mon Oct 14, 2019 6:14 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 Red Light
Replies: 10
Views: 241

Re: Raspberry Pi 4 Red Light

That its open at the sides is good for cooling, its bad that you can touch the GPIO's, as they form a liability for static electricity discharges, or shorts.

I would leave it as it is, and just keep your hands, and metal objects, away from the GPIO header. :mrgreen:
by mahjongg
Mon Oct 14, 2019 12:34 pm
Forum: Beginners
Topic: Regarding the current measurement
Replies: 7
Views: 123

Re: Regarding the current measurement

Yeah, and that's why I would like to know if there are any options to do it in software without risking the hardware (especially the CPU) with some code probably? I need to measure the power being consumed by the SOC. No! there is no hardware inside the SoC, to measure its own current consumption. ...
by mahjongg
Mon Oct 14, 2019 11:23 am
Forum: General discussion
Topic: pi4 as a thin client (citrix receiver)
Replies: 16
Views: 1724

Re: pi4 as a thin client (citrix receiver)

Personal messages are not supported on this forum, so you must supply an e-mail address, if you want to risk running this random OS image.
by mahjongg
Mon Oct 14, 2019 8:53 am
Forum: Automation, sensing and robotics
Topic: Half baked solution to the stereo camera problem on the Pi's.
Replies: 3
Views: 256

Re: Half baked solution to the stereo camera problem on the Pi's.

Its only expensive if you also buy the development kit, but if you bake your own carrier board, its cheap, far cheaper than two RPI3B+, cheaper even than one 3B+ and two Zero's. That is the whole idea.
by mahjongg
Sun Oct 13, 2019 7:33 pm
Forum: Troubleshooting
Topic: Not booting, even with new bootcode.bin
Replies: 11
Views: 240

Re: Not booting, even with new bootcode.bin

Could be you zapped it with static electricity, or any of the other "causes for sudden dead" scenarios listed in on of my pitfall sticky in beginners.
by mahjongg
Sun Oct 13, 2019 7:18 pm
Forum: Beginners
Topic: Regarding the current measurement
Replies: 7
Views: 123

Re: Regarding the current measurement

Not really, as it would imply putting a small resistor in series with the wire transferring the current to the SoC, (and other parts comprising what you want to monitor) and measuring the voltage drop over it. Meaning you would need to cut the connection somewhere between the power and the SoC, whic...
by mahjongg
Sun Oct 13, 2019 6:55 pm
Forum: General discussion
Topic: Problem: RPi Zero and keyboard
Replies: 14
Views: 546

Re: Problem: RPi Zero and keyboard

One thing I have noticed with a Zero is if its booted up, and you swap or plug something into the USB DATA port it has a habit of rebooting. That seems to be a problem with the newer models. There must have been some hardware change that was not accompanied by a revision change (same v1.1 revision ...
by mahjongg
Sun Oct 13, 2019 6:30 pm
Forum: Automation, sensing and robotics
Topic: Half baked solution to the stereo camera problem on the Pi's.
Replies: 3
Views: 256

Re: Half baked solution to the stereo camera problem on the Pi's.

are you aware that raspberry PI compute modules support two camera's, both with hardware, and software?
by mahjongg
Sun Oct 13, 2019 2:50 am
Forum: Beginners
Topic: mate 64 bit and rpi-4
Replies: 1
Views: 146

Re: mate 64 bit and rpi-4

yes.

use raspbian instead.
by mahjongg
Sun Oct 13, 2019 12:38 am
Forum: Beginners
Topic: 74hc165 how to connect and get data
Replies: 3
Views: 235

Re: 74hc165 how to connect and get data

get a HC165 datasheet, and study it. Also, power the HC165 with 3V3, for compatibility with the PI''s GPIO ten seconds of googling, and I found this, except powering the HC165 with 5V will blow up your PI: https://camo.githubusercontent.com/954a481a91fa250c8f3b726e799948886fb64a3e/68747470733a2f2f72...
by mahjongg
Sun Oct 13, 2019 12:35 am
Forum: Beginners
Topic: Can't get Google Domain name to point to pi
Replies: 30
Views: 1453

Re: Can't get Google Domain name to point to pi

Yes, this thread has run its course, and drifted off far from it, that is why I'm now locking it.
by mahjongg
Sat Oct 12, 2019 5:38 pm
Forum: General discussion
Topic: AVR assembler
Replies: 10
Views: 142

Re: AVR assembler

split off branch going away from the mean topic.
by mahjongg
Sat Oct 12, 2019 1:35 pm
Forum: Troubleshooting
Topic: Not booting, even with new bootcode.bin
Replies: 11
Views: 240

Re: Not booting, even with new bootcode.bin

Did you read the boot problem sticky in troubleshooting?

If not start there!
by mahjongg
Fri Oct 11, 2019 11:38 pm
Forum: Beginners
Topic: raspberry pi 4B act led blinks 2 times repeatedly
Replies: 7
Views: 189

Re: raspberry pi 4B act led blinks 2 times repeatedly

Unless the 32GB is a fake, it should work.

Please read the boot problem sticky in beginners for an explanation of the blink code meanings.
by mahjongg
Fri Oct 11, 2019 6:05 pm
Forum: General discussion
Topic: Will Quick Charge 3.0 provide consistent power to Raspberry Pi 4B?
Replies: 10
Views: 328

Re: Will Quick Charge 3.0 provide consistent power to Raspberry Pi 4B?

Yes, I"m just wondering if you plug a non-Quick Charge device into the Quick Charge 3.0 port, will it provide the voltage and amps required from the device. In this case, will the Pi 4 request 5V/3Amp, and will the Quick Charge 3.0 port provide that on each port? No it won't! PI's don't negotiate v...
by mahjongg
Thu Oct 10, 2019 5:57 pm
Forum: Off topic discussion
Topic: How to use magento to build your own online shop
Replies: 8
Views: 6321

Re: How to use magento to build your own online shop

Too many commercial posters (spammers) here, so locking!
by mahjongg
Thu Oct 10, 2019 12:12 pm
Forum: General discussion
Topic: Where to install Mosquitto for bidirectional communication
Replies: 5
Views: 388

Re: Where to install Mosquitto for bidirectional communication

rass9988 wrote:
Sat Mar 23, 2019 3:49 pm
Thanks everyone. I understand now.
Then I will lock this thread, to avoid people re-starting the discussion.
Flag a moderator if you want it reversed.

anyone else wanting to talk about this subject again, just start a new post.
by mahjongg
Wed Oct 09, 2019 1:19 pm
Forum: Off topic discussion
Topic: My ZX81 clone ZX81+35 and a PSG sound expansion board for it (now released on GitHub)
Replies: 87
Views: 27878

Re: My ZX81 clone ZX81+35 and a PSG sound expansion board for it (now released on GitHub)

Readied the schematic of revision 1.0 of the new pin though hole full ZX81 sized board (ZX81+38). It ONLY has pin through hole components, and fits on a PCB that can be used as a replacement for a real ZX81 (with all connectors on the correct places, and with correct mounting holes). It should be fu...
by mahjongg
Wed Oct 09, 2019 12:16 pm
Forum: Android
Topic: Pi 4 Gaming Laptop with Android
Replies: 12
Views: 507

Re: Pi 4 Gaming Laptop with Android

I just talked to one of the lineage os guys. Lineage can run on the 4B. I doubt it can be used as a gaming system. I doubt it will use GPU acceleration. I doubt you can use Googles Store, to install games. I just know you shouldn't use Android on an RPI, but yes, that's just my not so humble opinio...
by mahjongg
Tue Oct 08, 2019 3:38 pm
Forum: Beginners
Topic: Components and Pins
Replies: 14
Views: 482

Re: Components and Pins

One thing I learnt the hard way. Look carefully at the power strips on the breadboard. Often the lines have a little break in them - this shows the left side of the strip IS NOT connected to the right side of the strip. For example, this board has common power rails that run all the way along the b...
by mahjongg
Tue Oct 08, 2019 3:34 pm
Forum: Off topic discussion
Topic: I wanna unsolder display conector RASPBERRY PI 4
Replies: 11
Views: 638

Re: I wanna unsolder display conector RASPBERRY PI 4

alphanumeric wrote:
Tue Oct 08, 2019 12:40 pm
Never mind, I got that wrong.
???? :?: :?: :?:
by mahjongg
Tue Oct 08, 2019 11:58 am
Forum: Beginners
Topic: remote power on raspberry pi 4
Replies: 1
Views: 83

Re: remote power on raspberry pi 4

Plug the supply into a switched power bar, and switch the power to the supply off. PI's don't have a "sleep mode", so wake on lan is not possible. Don't use a supply that has a switch in the USB power cable, such switches have too much resistance in the "on" position, and may cause power drop-offs. ...
by mahjongg
Mon Oct 07, 2019 6:02 pm
Forum: Troubleshooting
Topic: Not Booting
Replies: 10
Views: 304

Re: Not Booting

... 26.37 volts ... 52.33 volts ... 52.70 ... I dont know if these voltages are correct or incorrect? :P please help me out here These are not correct! If the red led is on, then it's receiving the correct voltage, despite using an iffy supply. Make sure you are using your multimeter correctly - ch...

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