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by wh7qq
Sun Oct 17, 2021 7:32 pm
Forum: General discussion
Topic: Dupont cables connection problem
Replies: 14
Views: 590

Re: Dupont cables connection problem

The Dupont jumpers are something that you bless and curse almost simultaneously. I don't know of a suitable substitute but they are not all the same...some with thinner wires, aluminum wires, coated wires, etc. About all I can suggest is to buy all-copper wires of the heaviest gauge you can find and...
by wh7qq
Sat Oct 02, 2021 2:06 am
Forum: General discussion
Topic: Why is wifi so unreliable on RPI4?
Replies: 47
Views: 3035

Re: Why is wifi so unreliable on RPI4?

As Heater said: One would like to think so. But I have found all kind of things can interfere with wireless communication. As anyone with low powered UHF experience can attest, wireless communications are subject to all sorts of problems. If you need dependable, fast connections, run an Ethernet con...
by wh7qq
Fri Aug 20, 2021 7:05 pm
Forum: General discussion
Topic: Mouse failure
Replies: 8
Views: 489

Re: Mouse failure

If 400, comments do not apply. I missed that in the original post. It is applicable when wireless mouse seems to crap out. If, indeed, a 400, first try a different USB port then the command "lsusb", then a different wired mouse. If it doesn't show in "lsusb" and a different mous...
by wh7qq
Fri Aug 20, 2021 6:50 pm
Forum: General discussion
Topic: Mouse failure
Replies: 8
Views: 489

Re: Mouse failure

If 400, comments do not apply. I missed that in the original post. It is applicable when wireless mouse seems to crap out.
by wh7qq
Fri Aug 20, 2021 6:22 pm
Forum: General discussion
Topic: Mouse failure
Replies: 8
Views: 489

Re: Mouse failure

You did not mention what model of mouse, corded or wireless, you are using. I have several Logitech M325 cordless rodents which have failed. Both have single AA cells and I theorize that the low voltage battery contacts get crapped up and the mouse dies as a result...not enough voltage to get past t...
by wh7qq
Sat Aug 14, 2021 7:43 pm
Forum: General discussion
Topic: Pi 4 Shorted and smoked, but still working
Replies: 3
Views: 294

Re: Pi 4 Shorted and smoked, but still working

Don't use it in "mission critical" applications as it may fail at any time or not.
by wh7qq
Sat Jul 24, 2021 8:09 pm
Forum: General discussion
Topic: Filrc case temperatures with Pi-Hole
Replies: 3
Views: 277

Re: Filrc case temperatures with Pi-Hole

If all your 3B is doing is pihole and no Desktop, it will be perfectly happy. Start looking at web pages and in particular some of Adafruit's tech documents and it will really go up in a hurry. I have an early B+ doing pihole duties 24/7 but headless in an early Adafruit plastic case with minimal ve...
by wh7qq
Tue Jun 22, 2021 5:34 pm
Forum: General discussion
Topic: Can the Pi drive a logic level mosfet directly?
Replies: 6
Views: 513

Re: Can the Pi drive a logic level mosfet directly?

A series resistor is always a good idea with the GPIO pins connected to any load.
by wh7qq
Mon May 31, 2021 8:51 pm
Forum: General discussion
Topic: Power consumption : RP pico + wifi or RP Zero ?
Replies: 2
Views: 458

Re: Power consumption : RP pico + wifi or RP Zero ?

If you are really trying to minimize power consumption, the ESP-now protocol looks very interesting...requires a master and slave esp8266 or esp32 or nodeMCU but bursts rf briefly and then goes back to sleep and the slave just sits there waiting for a signal. 250 bit limit should not be a problem fo...
by wh7qq
Sun May 23, 2021 4:31 pm
Forum: General discussion
Topic: Car batteries and HW-681 buck converters
Replies: 7
Views: 404

Re: Car batteries and HW-681 buck converters

Do maintain the charge on the battery. Automotive batteries are designed to provide extremely high currents for short periods and then promptly get recharged by the running engine. If deeply discharged, they can deform their plates and short out against themselves. Deep cycle or marine batteries are...
by wh7qq
Sun May 16, 2021 6:20 pm
Forum: General discussion
Topic: Raspberry Pi 4 Wifi not working
Replies: 7
Views: 509

Re: Raspberry Pi 4 Wifi not working

Sorry, the soldering job is way harder than i thought after actually looking this up. do you maybe know how to disable the wifi module? Glad you decided not to get out the soldering iron...good way to permanently mess up the board. I was going to suggest a USB dongle but epoch1970 got there first. ...
by wh7qq
Sun May 16, 2021 4:23 pm
Forum: General discussion
Topic: Raspberry Pi 4 Wifi not working
Replies: 7
Views: 509

Re: Raspberry Pi 4 Wifi not working

The "lazy" way to fix it is to remove the existing SD card and burn a new SD card and then follow the instructions in https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=311932. The wifi should work with the new OS installed but you will have to enter the WPA passphrase again. Did ...
by wh7qq
Fri May 14, 2021 7:27 pm
Forum: General discussion
Topic: Is it possible to get Mac OS Big Sur downloaded onto Pi 4?
Replies: 7
Views: 1317

Re: Is it possible to get Mac OS Big Sur downloaded onto Pi 4?

From https://support.apple.com/en-gb/HT211238: If upgrading from macOS Sierra or later, macOS Big Sur requires 35.5 GB of available storage to upgrade. If upgrading from an earlier release, macOS Big Sur requires up to 44.5 GB of available storage. Not many Pis have 44.5 Gig handy and available for ...
by wh7qq
Tue May 11, 2021 8:12 pm
Forum: General discussion
Topic: rpi4 lid with gpio access
Replies: 2
Views: 163

Re: rpi4 lid with gpio access

At least on this web site, the "official" RPi 4 case is not shown to be available in black...site not updated yet? Still, no specific access to the GPIO header seems to be present. You might be able to squeeze a few DuPont jumpers in...not sure...but if you strip away the black protector o...
by wh7qq
Tue May 04, 2021 9:52 pm
Forum: General discussion
Topic: RasberryPi 400: good choice for a freelancer writer/ghostwriter?
Replies: 29
Views: 1430

Re: RasberryPi 400: good choice for a freelancer writer/ghostwriter?

Not saying anything bad about the 4B or the 400, either would handle the load, but as you would probably need a power supply and monitor, for just a bit more you could get a Chromebook with all of that as part of the package, plus the increased portability inherent in a laptop form factor. Probably ...
by wh7qq
Tue Apr 27, 2021 2:01 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Rpi 4 SPI performing better using bench power supply
Replies: 3
Views: 362

Re: Rpi 4 SPI performing better using bench power supply

Just be certain you don't mis-adjust the power supply (bump or other disturbance) leaving you with overcooked Pi :o :o
by wh7qq
Tue Apr 27, 2021 1:55 am
Forum: Off topic discussion
Topic: What size screw driver for Philips and bolts do I need?
Replies: 37
Views: 2474

Re: What size screw driver for Philips and bolts do I need?

As for phillips heads, no two seem alike. I have quite an assortment, some to fat or small, some too deep or shallow. It's a crap shoot. you just try until it fits.
I think 2.5 mm is pretty standard on the RPi but I could be wrong. Length just depends on the parts.
by wh7qq
Fri Apr 16, 2021 12:55 am
Forum: General discussion
Topic: Is it safe to plug in two motors at once?
Replies: 4
Views: 290

Re: Is it safe to plug in two motors at once?

The danger to the RPi would be from the inductive voltage spike that occurs when DC motors are stopped or reversed. The low voltage from excess running current could cause a shutdown or brown out, borking the uSD memory. Safety to the RPi would be assured by separate supplies for RPi and servos but ...
by wh7qq
Sat Apr 10, 2021 10:10 pm
Forum: General discussion
Topic: Raspberry Pi sleep and wake using RTC DS3231
Replies: 7
Views: 580

Re: Raspberry Pi sleep and wake using RTC DS3231

The WittyPi 3 (http://www.uugear.com/product/witty-pi- ... pberry-pi/) does this with some extra circuits. Not expensive either.
by wh7qq
Sat Apr 10, 2021 4:34 pm
Forum: General discussion
Topic: Chromium hangs on certain websites
Replies: 6
Views: 614

Re: Chromium hangs on certain websites

Some of the Adafruit .pdf files are huge with lots of graphics. They are pretty intensive and the older RPis were not up to the task. The same was true of Firefox LTS. Best to view those with an x86 or a 4B/400. I saw thermometer warnings frequently on those until I attached heat sinks. I have heard...
by wh7qq
Thu Apr 08, 2021 2:16 am
Forum: General discussion
Topic: ssd shield cases?
Replies: 6
Views: 339

Re: ssd shield cases?

Seems like you could fill the bill with a "case" using a pair of acrylic sheets and the appropriate spacer for the RPi and another sheet/spacer set underneath for the SSD. As they seem to be a standard size and thickness, a snug fit should be easy. The USB adapter is another story. I have ...
by wh7qq
Wed Apr 07, 2021 7:35 pm
Forum: General discussion
Topic: Simple PI4 question -- inet performance
Replies: 2
Views: 202

Re: Simple PI4 question -- inet performance

4B ethernet is better than 3B+...allegedly full 1G performance vs. ~300M for the 3B+...but few web pages actually need or deliver at that speed. If you are using wifi, the performance is always going to be a function of signal strength between your RPi and the AP. There are too many other factors in...
by wh7qq
Mon Apr 05, 2021 12:19 am
Forum: General discussion
Topic: Smallest operating system?
Replies: 6
Views: 659

Re: Smallest operating system?

Depends on your program...512 Meg is not a lot but RaspiOS lite has a pretty small footprint when running and memory usage is small compared to the 512. My 1+ is taking up 57 M while running pihole (measured by htop). Is your program greater than 450M? You may be spending too much time looking for a...
by wh7qq
Fri Apr 02, 2021 1:34 am
Forum: General discussion
Topic: USB WIFI adapter for Raspberry Pi 4B
Replies: 8
Views: 516

Re: USB WIFI adapter for Raspberry Pi 4B

A few have external antennas but be sure the chipset is supported.

I use an "armor " case (the all-fin kind) on a 3B+ and it does attenuate a bit...wavemon gives a pretty good idea of how much. Do turn off the on-board wifi if you do use a USB wireless.
by wh7qq
Wed Mar 31, 2021 12:59 am
Forum: General discussion
Topic: I accidentally broke some components on the mainboard, can someone help me to identify what they are?
Replies: 2
Views: 374

Re: I accidentally broke some components on the mainboard, can someone help me to identify what they are?

Another way to say @alphanumeric's comment is that if you can't readily identify the bits and the locations they came from, there is little or no chance you will have the skill or equipment required for a successful repair. Buy another RPi...much less expensive and frustrating. Welcome to the age of...

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