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by wh7qq
Sun Sep 16, 2018 7:11 pm
Forum: General discussion
Topic: If I connect 5V output sensor directly with raspberry pi 3b+ so it is harmful for my raspberry pi. Yes or No?
Replies: 4
Views: 171

Re: If I connect 5V output sensor directly with raspberry pi 3b+ so it is harmful for my raspberry pi. Yes or No?

The DHT11 is always shown in instructions as having an external "pull-up" resistor to the 5V supply (4.7k to 10K) as in the following instruction: https://learn.adafruit.com/dht-humidity-sensing-on-raspberry-pi-with-gdocs-logging/wiring . Unfortunately, these instructions show the breadboard accesso...
by wh7qq
Wed Sep 12, 2018 2:00 am
Forum: General discussion
Topic: As of 09/08/2018, Don't run apt-get/apt-upgrade if you rely on wireless connection [apparently not true!]
Replies: 34
Views: 1235

Re: As of 09/08/2018, Don't run apt-get/apt-upgrade if you rely on wireless connection [apparently not true!]

Seems like pretty good advice to me...regardless of your wireless hardware. The uncertainty of wireless communication in general makes it seem like a bad idea at best. If a neighboring system overpowers your AP, or other RF disturbance occurs, the impact of the interruption on your system might or m...
by wh7qq
Wed Sep 12, 2018 1:46 am
Forum: General discussion
Topic: Hello im new and looking to learn (OBD)
Replies: 10
Views: 274

Re: Hello im new and looking to learn

It all works pretty well for Kodi to watch films on the go... *Please* don't try to watch movies while you're driving. Or, if you insist on doing so, please stay out of California. Add Hawaii and the other 48 to that list. From the model he mentioned, I do not think he is in the States...more likel...
by wh7qq
Wed Sep 12, 2018 1:37 am
Forum: General discussion
Topic: How to avoid usb flash drive getting hot when idle?
Replies: 5
Views: 234

Re: How to avoid usb flash drive getting hot when idle?

Have you actually measured "hot"? Your perception of hot is not useful information. USB memories typically run hot...the bigger, the hotter. As most have plastic envelopes, much of the heat gets radiated by the metal connector body. 16G is not huge but it will still get warm just sitting there. That...
by wh7qq
Tue Sep 11, 2018 12:35 am
Forum: Beginners
Topic: Pi 3B+ V1.2 extremely slow
Replies: 18
Views: 401

Re: Pi 3B+ V1.2 extremely slow

What is wrong? Possibly nothing. What kind of memory are you using...size and class of uSD card? Download speed from the Swedish site means little...individual sites are all over the place for speed. The speedtest-cli test is more meaningful and I would be happy as a clam at 20 Mb/sec. What is your...
by wh7qq
Fri Sep 07, 2018 9:05 pm
Forum: Beginners
Topic: Rpi disconnects from wi fi module randomnly
Replies: 7
Views: 138

Re: Rpi disconnects from wi fi module randomnly

If it is that critical to stay connected, the first suggestion is to use ethernet...not as "pretty" as wifi but very secure and solid. It doesn't drop out without your intervention. Another possibility is permission. The "Unable to connect..." error message smacks a bit of that. Check to be sure you...
by wh7qq
Fri Sep 07, 2018 9:00 pm
Forum: Beginners
Topic: Rpi disconnects from wi fi module randomnly
Replies: 7
Views: 138

Re: Rpi disconnects from wi fi module randomnly

If it is that critical to stay connected, the first suggestion is to use ethernet...not as "pretty" as wifi but very secure and solid. It doesn't drop out without your intervention. Another possibility is permission. The "Unable to connect..." error message smacks a bit of that. Check to be sure you...
by wh7qq
Fri Sep 07, 2018 8:42 pm
Forum: Advanced users
Topic: Software Shutdown for Battery Powered Pi
Replies: 3
Views: 201

Re: Software Shutdown for Battery Powered Pi

How about a schematic, even hand drawn, of your setup from the 12 volt source, including the charger (1000[C]?), the battery (voltage and type) and the RPi (model?). It is hard to give any advice without knowing exactly how you have it all hooked together.
by wh7qq
Wed Sep 05, 2018 10:58 pm
Forum: General discussion
Topic: Cooling - Blow On? Blow Off?
Replies: 4
Views: 181

Re: Cooling - Blow On? Blow Off?

It matters little...just get the cooler air to the RPi...doesn't matter too much whether you suck or blow. Several folks in the know on these forums have stated that the thermal management on the 3B+ is much better than the 3B. Still, it needs a 2.5 amp supply and at higher clock speeds, it probably...
by wh7qq
Tue Sep 04, 2018 2:42 am
Forum: Beginners
Topic: Learning the GPIO pins and what they do.
Replies: 5
Views: 222

Re: Learning the GPIO pins and what they do.

All of the current RPis have the same layout of the GPIO pins. I use an older B+ but set up the uSD cards on a 3B, including the code that accesses the GPIO pins. Only the earliest RPis have a different layout (26 pins) but even they are the same as later machines. Another example: the same AudioInj...
by wh7qq
Mon Sep 03, 2018 7:27 pm
Forum: Troubleshooting
Topic: Pi crashes after bootup
Replies: 4
Views: 161

Re: Pi crashes after bootup

It worked really well. I could access all the data using a Linux computer. Well, the RPi had sat for about one day, I pulled the plug because I wanted to restart it anyways but regretted it right after I pulled it because I already feared I had destroyed the Pi. I don't think I will ever again pull...
by wh7qq
Sun Sep 02, 2018 2:24 am
Forum: Media centres
Topic: How good is the camera? Wondering about viability for car multi-purpose device.
Replies: 7
Views: 340

Re: How good is the camera? Wondering about viability for car multi-purpose device.

The problem with investing in something better (besides the fact that it would only achieve one purpose anyway) is that that gets quite costly. They can easily exceed my current budget. Fine, so long as replacement costs don't build up on you. 60 C is not over the top for a 3B although I hear you w...
by wh7qq
Sat Sep 01, 2018 7:19 pm
Forum: Media centres
Topic: How good is the camera? Wondering about viability for car multi-purpose device.
Replies: 7
Views: 340

Re: How good is the camera? Wondering about viability for car multi-purpose device.

The new RPi cameras are reasonably sharp and will probably provide the resolution you require but heat is the big enemy and there is no way to account for that. The air temp in a closed car parked in the sun can easily exceed 60 C. The throttling that occurs at high temps with the RPi could be a pro...
by wh7qq
Sat Sep 01, 2018 6:52 pm
Forum: Troubleshooting
Topic: Pi crashes after bootup
Replies: 4
Views: 161

Re: Pi crashes after bootup

The association with "pulling the plug" makes for a pretty strong case that the boot partition on your uSD card is borked. The only way I know of to recover your data is with another computer that supports the ext4 file system (ie. a Linux computer). With that and a uSD reader, if not built in, you ...
by wh7qq
Fri Aug 31, 2018 7:29 am
Forum: Troubleshooting
Topic: Zero-W Wifi Problem
Replies: 4
Views: 156

Re: Zero-W Wifi Problem

It sounds like your zero-w is out of range for the onboard radio system and the USB dongles working well confirms it. Either go with the dongles or move closer to the AP or reduce the barriers to propagation (walls, metal cabinets, floors, etc.).
by wh7qq
Sun Aug 26, 2018 6:35 pm
Forum: General discussion
Topic: NOOB installation instructions for linux required.
Replies: 6
Views: 191

Re: NOOB installation instructions for linux required.

Noobs installation should be nearly automatic, IF your installation media is good. Check the sha256sum of your downloaded zip file against the sum published along with the download on this web site. There are lots of free sha256sum programs on the web for Windows or Apple (it is built in from the co...
by wh7qq
Sun Aug 26, 2018 6:31 pm
Forum: General discussion
Topic: NOOB installation instructions for linux required.
Replies: 6
Views: 191

Re: NOOB installation instructions for linux required.

Noobs installation should be nearly automatic, IF your installation media is good. Check the sha256sum of your downloaded zip file against the sum published along with the download on this web site. There are lots of free sha256sum programs on the web for Windows or Apple. Use Etcher (not win32diski...
by wh7qq
Sun Aug 26, 2018 6:18 pm
Forum: Beginners
Topic: switching psu 5 volt - which one to take?
Replies: 2
Views: 107

Re: switching psu 5 volt - which one to take?

Depends entirely on your intended use...RPi? Which model? Assuming RPi 3B+, 2.5 Amps at 5 Volts is required, especially if you plan to use USB accessories. Still, most of what was present on the web page you gave requires a higher DC voltage input...so they do not connect directly to the mains. If y...
by wh7qq
Sun Aug 26, 2018 5:47 am
Forum: Arch
Topic: [updated] kernel update issue
Replies: 6
Views: 285

Re: kernel update issue

"if it ain't broke, don't fix it." Firmware updates may possibly effect dependencies with other software packages so best not to do them unless specifically told to do so by RPIF or others.
by wh7qq
Sun Aug 26, 2018 5:43 am
Forum: Troubleshooting
Topic: Raspberry Pi 3 B+ WiFi stopped working
Replies: 3
Views: 91

Re: Raspberry Pi 3 B+ WiFi stopped working

It sounds like you moved or something else changed that impacted rf propagation between the RPi and the AP. The dongle probably has a physically larger antenna...stay with it if it works.
by wh7qq
Sat Aug 25, 2018 4:45 pm
Forum: Beginners
Topic: WLAN Setup issues
Replies: 10
Views: 284

Re: WLAN Setup issues

Well, that is out of the way...not the problem. Can you reach the web interface of the Fritzbox from the RPi?
by wh7qq
Fri Aug 24, 2018 6:03 pm
Forum: Troubleshooting
Topic: Bounce issues after connecting 24DC power to relays
Replies: 6
Views: 148

Re: Bounce issues after connecting 24DC power to relays

ust using the GPIO pins directly to the relays. Trying to stay away from the commercial boards so I can learn more about how the circuits work. The commercial relay board mfgrs (SainSmart, etc.) don't use opto isolators just to inflate the parts count. They protect the outputs of the RPi or whateve...
by wh7qq
Thu Aug 23, 2018 6:58 pm
Forum: Beginners
Topic: WLAN Setup issues
Replies: 10
Views: 284

Re: WLAN Setup issues

Please post your wpa_supplicant.conf file (in /etc/wpa_supplicant/ directory.
by wh7qq
Wed Aug 22, 2018 7:38 pm
Forum: Networking and servers
Topic: Raspberry pi drops wifi
Replies: 1
Views: 143

Re: Raspberry pi drops wifi

Wireless is ALWAYS a sometime thing...when all conditions are favorable. Excess distance from the AP, floors, walls, interference from other devices, interference from neighbors on the same channel and on and on, can work singly or in concert to cause your wireless signal to fail. The ultimate solut...
by wh7qq
Wed Aug 22, 2018 4:24 pm
Forum: Beginners
Topic: Adding 433Mhz. receiver to an automotive lift motor-Want Pi to be a timer
Replies: 4
Views: 87

Re: Adding 433Mhz. receiver to an automotive lift motor-Want Pi to be a timer

To clarify a bit, when a triac receives a transient high voltage spike, it may short over, ie. turn on all the way. It will turn off when the power is removed or it just burns up. Make damn good and sure to take steps to prevent the spikes from getting through and to have positive cut-offs in place ...

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