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by Paul Hutch
Tue Feb 11, 2020 7:41 pm
Forum: General discussion
Topic: Heat torture testing Pi4
Replies: 37
Views: 1226

Re: Heat torture testing Pi4

That because we throttle the CPU when it get to 85 to keep the temperatures down. I've never seen anything over 90 in normal usage, so no idea how you are getting your CPU temperature so high - I suspect it should have shut down. Is this an actual shut down or just throttling that you are referring...
by Paul Hutch
Tue Feb 11, 2020 1:54 pm
Forum: Python
Topic: Make Learning Python Easy ?
Replies: 12
Views: 2710

Re: Make Learning Python Easy ?

I'll take a close look at the Raspberry Pi foundation's Python Intro for sure.. & thank you everyone for all your collective inputs. From what I've seen I'll learn version 2.x first and then maybe move on to 3.x. ... That's similar to deciding to learn old english before learning modern english. :P...
by Paul Hutch
Sat Feb 08, 2020 12:29 am
Forum: Advanced users
Topic: use SD Card Copier in batch mode
Replies: 8
Views: 529

Re: use SD Card Copier in batch mode

dandan21 wrote:
Thu Feb 06, 2020 1:58 pm
Thanks, but this refers to unix or mac.
I want to run this from my Pi same as i do (manually) with SD Card Copier
The Pi runs a version of unix, specifically the Raspbian distribution of Linux, and those instructions are from the Raspberry Pi Foundation.
by Paul Hutch
Thu Feb 06, 2020 11:30 am
Forum: General discussion
Topic: PI3 - lightning bolt only during boot.
Replies: 7
Views: 263

Re: PI3 - lightning bolt only during boot.

Yes that's the kind.

The switch resistance increase with time will be insignificant at the higher voltage level.
by Paul Hutch
Thu Feb 06, 2020 11:06 am
Forum: General discussion
Topic: PI3 - lightning bolt only during boot.
Replies: 7
Views: 263

Re: PI3 - lightning bolt only during boot.

For longest service life have the switch on the AC power side of the power supply.
by Paul Hutch
Mon Feb 03, 2020 4:19 pm
Forum: Advanced users
Topic: use SD Card Copier in batch mode
Replies: 8
Views: 529

Re: use SD Card Copier in batch mode

The official page on backups may help you get asystem in place
https://www.raspberrypi.org/documentati ... /backup.md
by Paul Hutch
Tue Jan 28, 2020 9:54 pm
Forum: General discussion
Topic: Raspberry pi zero and battery
Replies: 6
Views: 281

Re: Raspberry pi zero and battery

I think that's just an advertising claim. An easier way to power a Pi0 from a battery is to buy a commercial powerbank and a suitable cable and go with that. While it is definitely an opinion from the manufacturer as well as the international distributor, it is also my opinion as well. Some commerc...
by Paul Hutch
Tue Jan 28, 2020 9:30 pm
Forum: General discussion
Topic: Raspberry pi zero and battery
Replies: 6
Views: 281

Re: Raspberry pi zero and battery

I would like to connect a 3.7 V battery to my Juicebox zero and then turn up the voltage to 5 V. Does the Juicebox zero do this step-up tension automatically? Yes, it's automatic. JuiceBox Zero is designed specifically for the Raspberry Pi Zero to let you power it from a battery. It’s the simplest ...
by Paul Hutch
Tue Jan 28, 2020 9:16 pm
Forum: General discussion
Topic: Write Protect SD card brownout protection
Replies: 9
Views: 447

Re: Write Protect SD card brownout protection

rpdom wrote:
Tue Jan 28, 2020 6:07 pm

Three versions? There have only been two Buster image releases so far... or do you mean Lite/Standard/Full? If so, all of them have that option.

sudo raspi-config -> 7 Advanced Options -> AB Overlay FS
Yes I meant Lite/Standard/Full, thank you very much for the help.
by Paul Hutch
Tue Jan 28, 2020 3:51 pm
Forum: General discussion
Topic: Write Protect SD card brownout protection
Replies: 9
Views: 447

Re: Write Protect SD card brownout protection

davidcoton wrote:
Tue Jan 28, 2020 3:30 pm
Try Buster.
That's my guess too, hoping somebody knows for sure which versions actually have this feature so I don't waste time trying all three Buster versions.
by Paul Hutch
Tue Jan 28, 2020 3:40 pm
Forum: Advanced users
Topic: Run python scripts using mobile app
Replies: 2
Views: 175

Re: Run python scripts using mobile app

Thank you for the tip scotty101, it works great.
https://play.google.com/store/apps/deta ... k&hl=en_US

Now if only Android would support zeroconf (Avahi/Bonjour) so I can use hostname.local instead of an IP address.
by Paul Hutch
Tue Jan 28, 2020 3:27 pm
Forum: General discussion
Topic: Write Protect SD card brownout protection
Replies: 9
Views: 447

Re: Write Protect SD card brownout protection

rpdom wrote:
Tue Jan 28, 2020 7:43 am
The config menu in Raspbian allows you to set up a read-only system. You need to reboot afterwards for it to take effect.
Which version(s) of Raspbian have this?

I can't find it in raspi-config on Stretch Lite or Desktop.
by Paul Hutch
Mon Jan 27, 2020 8:39 pm
Forum: General discussion
Topic: Wifi Antenna
Replies: 19
Views: 586

Re: Wifi Antenna

For a defense industry application where they want to make sure there can never be a WiFi signal, I would definitely use a Raspberry Pi 2 Model B instead of any model that has Wifi hardware on board.
by Paul Hutch
Mon Jan 27, 2020 4:02 pm
Forum: General discussion
Topic: Wifi Antenna
Replies: 19
Views: 586

Re: Wifi Antenna

Since there are no schematics for the WiFi part of the system there is no way to be sure what would happen if you remove either of those capacitors. Even if it did stop the WiFi from working it could also make it illegally emit radio interference. Your best option is to switch to a Raspberry Pi that...
by Paul Hutch
Wed Jan 22, 2020 1:17 pm
Forum: General discussion
Topic: Max232 Board with RPI
Replies: 10
Views: 628

Re: Max232 Board with RPI

You are right. In my project RPI is connected to other board via MAX232. I want to eliminate MAX232 and want to use this cable. I am using Android Things OS on RPI 3 Model B There is no way to use the cable you show without the the MAX232 convertor because all the circuitry that does the serial to ...
by Paul Hutch
Tue Jan 21, 2020 1:26 pm
Forum: Python
Topic: Problems with serial port and RS232
Replies: 5
Views: 427

Re: Problems with serial port and RS232

@Paul Hutch I have performed the loopback test in the link you gave me. When I run minicom and type nothing shows up. Is my rpi3 or its serial broken? It may be broken, definitely try hippy's code to rule out a problem with your minicom settings (minicom is a PITA to configure for those not familia...
by Paul Hutch
Mon Jan 20, 2020 1:34 pm
Forum: Python
Topic: Problems with serial port and RS232
Replies: 5
Views: 427

Re: Problems with serial port and RS232

There are multiple points of possible failure in that setup. When troubleshooting a system like that I start with loopback tests. First on the Pi's UART, next the TTL to TIA-232 adaptor (RS232-Serial adaptor), and finally on the TIA-232 to USB adapter (RS232-USB Cable). When the system passes all of...
by Paul Hutch
Mon Jan 20, 2020 1:16 pm
Forum: General discussion
Topic: Design Ideas
Replies: 11
Views: 477

Re: Design Ideas

It varies between projects and especially project types. Generally between two and twenty, half dozen on average.
by Paul Hutch
Wed Jan 15, 2020 3:17 pm
Forum: General discussion
Topic: Interfacing with a touch tone telephone through RJ11
Replies: 2
Views: 167

Re: Interfacing with a touch tone telephone through RJ11

rpdom's suggestion is the best approach to get done what you want. If you wanted to do this without hacking the phone you may need to emulate much of the POTS system it is designed to use. This might include; a -48VDC power supply, circuitry to detect the current draw on the -48V supply, circuitry t...
by Paul Hutch
Wed Jan 15, 2020 2:56 pm
Forum: General discussion
Topic: Max232 Board with RPI
Replies: 10
Views: 628

Re: Max232 Board with RPI

Is the MAX232 is powered from the Pi? If yes, is it powered from the 5V or 3.3V Pi power pins? If it's powered by the Pi's 5V then it is damaging the Pi. If it's powered by the Pi's 3.3V no damage is occurring, the problem is just that the MAX232 is not reliable with 3.3V power. When using a premade...
by Paul Hutch
Tue Jan 14, 2020 2:22 pm
Forum: General discussion
Topic: PLC / Industrial I/O "shield" for any of the RPi's?
Replies: 13
Views: 9735

Re: PLC / Industrial I/O "shield" for any of the RPi's?

One of the big manufacturers in the industrial/PLC accessories space, Opto22, has some RasPi stuff.
https://info.opto22.com/raspberry-pi-io
by Paul Hutch
Wed Jan 08, 2020 4:24 pm
Forum: General discussion
Topic: Raspberry Pi Zero and battery
Replies: 2
Views: 189

Re: Raspberry Pi Zero and battery

From reading the documentation I've found, yes, the micro USB connector on the JuiceBox Zero module charges the battery.

See the official website for more details. https://juiceboxzero.com/
by Paul Hutch
Tue Jan 07, 2020 1:37 pm
Forum: Advanced users
Topic: Odd routing, cannot force 4b Pi to 2.4 GHz wifi (wpa_supplicant)
Replies: 16
Views: 999

Re: Odd routing, cannot force 4b Pi to 2.4 GHz wifi (wpa_supplicant)

I missed that you'd tried it outside of the network block. I use this successfully but from inside the network block on Raspbian Stretch. network={ ssid="FAKESSID" psk="fakepassphrase" key_mgmt=WPA-PSK freq_list=2412 2417 2422 2427 2432 2437 2442 2447 2452 2457 2462 } When you use freq_list outside ...
by Paul Hutch
Tue Jan 07, 2020 1:02 pm
Forum: Advanced users
Topic: Odd routing, cannot force 4b Pi to 2.4 GHz wifi (wpa_supplicant)
Replies: 16
Views: 999

Re: Odd routing, cannot force 4b Pi to 2.4 GHz wifi (wpa_supplicant)

You can use the freq_list parameter in wpa_supplicant.conf to limit what frequency/channels the Pi will connect to. List of channels: https://en.wikipedia.org/wiki/List_of_WLAN_channels Examples: Only allow North American 2.4 GHz channels: freq_list=2412 2417 2422 2427 2432 2437 2442 2447 2452 2457 ...

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