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by wh7qq
Sun Jun 24, 2018 6:54 pm
Forum: Beginners
Topic: Looking for advice on home server / media center setup
Replies: 1
Views: 75

Re: Looking for advice on home server / media center setup

I use an older B+ for a pi-hole and it works well as far as I can tell. The cpu usage is low...4% max but I have nothing else running on it...no desktop, server, or other activity. Usage will jump to 14% with the web server being accessed from a remote device (this computer) but that is not consiste...
by wh7qq
Sun Jun 24, 2018 6:25 pm
Forum: Beginners
Topic: Connecting and reading information from another device
Replies: 4
Views: 115

Re: Connecting and reading information from another device

You don't provide any information about what the board is supposed to be doing or what format the data is in or what form the output has (serial, i2c, ???) so how do you expect us to answer? Is this something for a refrigerated truck? The RPi has a wide range of ways to communicate with devices but ...
by wh7qq
Sat Jun 23, 2018 7:50 am
Forum: General discussion
Topic: Connecting/reading a flow meter from RPi
Replies: 26
Views: 555

Re: Connecting/reading a flow meter from RPi

Wrong button
by wh7qq
Wed Jun 20, 2018 7:55 pm
Forum: Other projects
Topic: Measuring Amp-age and Voltage to calculate Wattage for Power metering
Replies: 1
Views: 80

Re: Measuring Amp-age and Voltage to calculate Wattage for Power metering

On the assumption that you want to measure AC volts and current consumption for your whole house, possibly the best source of information for this is https://www.raspberrypi.org/blog/open-source-energy-monitoring-raspberry-pi/ and https://guide.openenergymonitor.org . The current monitor is packaged...
by wh7qq
Mon Jun 18, 2018 7:42 pm
Forum: Automation, sensing and robotics
Topic: Power supply and element suggestions for my first project ever
Replies: 1
Views: 102

Re: Power supply and element suggestions for my first project ever

You did not mention the time frame for coming to the new temperature, but the peltiers you give as example are huge, power hungry and super costly. I bumped up against a few of these problems in a past life so that is my frame of reference. My task was to maintain the temp of small volumes of flowin...
by wh7qq
Fri Jun 15, 2018 3:02 am
Forum: Beginners
Topic: Ethernet doesn't work + random problems
Replies: 1
Views: 148

Re: Ethernet doesn't work + random problems

You did not mention the model of RPi you are using, but all should boot with the ethernet turned on. With your other problems, it is suspicious that your uSD card is properly burned. Assuming that you are using Raspbian as your OS, first, check the sha256sum of your downloaded .zip file. If that che...
by wh7qq
Wed Jun 13, 2018 7:06 pm
Forum: General discussion
Topic: GPIO Pin Layout
Replies: 1
Views: 95

Re: GPIO Pin Layout

The pins themselves are numbered in order but the assignment of GPIO ports is probably more a function of convenience for the PC board designer than anything else. If it leads to a more direct routing of traces on the PC board, or a reduction in interference from adjacent traces, that is what they w...
by wh7qq
Wed Jun 13, 2018 6:40 pm
Forum: Troubleshooting
Topic: Pi not booting up.
Replies: 2
Views: 108

Re: Pi not booting up.

Where are you getting the uSD cards? 1.7Gb sounds like you might have gotten a counterfeit. If you have windows, the free utility "h2testw" will check your uSD card out. Get name brand cards from a reputable source. SanDisk from Amazon is a pretty good bet and not expensive. 8Gb or larger, Class 10 ...
by wh7qq
Tue Jun 12, 2018 7:27 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Circuit using a MOSFET to control power
Replies: 7
Views: 445

Re: Circuit using a MOSFET to control power

Sorry...the link I posted has gone bad since I last visited. I did make a hard copy for my file and extracted the url from that. Dougie Lawson's link is close enough. The other link had the load between the power source and drain side of the MOSFET and the source goes to ground. Either way works.
by wh7qq
Tue Jun 12, 2018 5:23 am
Forum: Troubleshooting
Topic: Raspian Stretch ZIP download problem
Replies: 1
Views: 68

Re: Raspian Stretch ZIP download problem

It could be many different causes. Is your memory too full? Is the drive you are saving to too small? What computer and OS are you using to download? What software/download manager? From the browser or another program? Tell us all, from the ISP to the modem/router to computer.
by wh7qq
Tue Jun 12, 2018 5:04 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Circuit using a MOSFET to control power
Replies: 7
Views: 445

Re: Circuit using a MOSFET to control power

Your image does not come up for me but if your circuit looks similar to this, it should work...specific to the 2N7000 but also works with other devices with similar specs.

http://elinux.org/GPIO/RPi_GPIO_Interface_Circuits.
by wh7qq
Tue Jun 12, 2018 2:06 am
Forum: General discussion
Topic: TI-84 Calculator as a Monitor
Replies: 1
Views: 117

Re: TI-84 Calculator as a Monitor

Take a look at ticalc.org. Their help section shows some support for IRC chat and a mail list. If the OTG connector allows download of data, programs and the like, you should be able to input text as well but to use it as an interactive terminal..I doubt it. Still, the TI-Innovator System web page h...
by wh7qq
Sun Jun 10, 2018 6:27 pm
Forum: Troubleshooting
Topic: Raspberry PI 3 Running Very Slow!
Replies: 3
Views: 178

Re: Raspberry PI 3 Running Very Slow!

TheUniqueGamer said: ...ive noticed it seems a bit slow Slow relative to what? The RPi 3B is not a gaming machine...never was or will be fast enough for online multiuser gaming. If you expect it to keep up with a modern x86 machine from Intel or AMD, forget it. The 3B is serviceable as a desktop if ...
by wh7qq
Fri Jun 08, 2018 7:08 pm
Forum: Weather station
Topic: Weatherproof box for the Raspberry with camera
Replies: 3
Views: 419

Re: Weatherproof box for the Raspberry with camera

Glass will always be optically superior to plastic...especially over the long term where sun and cosmic radiation will cause plastics to take on a yellowish color. On the flip side, glass can be fragile as I am sure you realize. For a shorter term, plastic like acrylic is fine and unbreakable but be...
by wh7qq
Thu Jun 07, 2018 2:20 am
Forum: Advanced users
Topic: Raspberry Pi B+ Model Heating issues and finally damaged.
Replies: 1
Views: 205

Re: Raspberry Pi B+ Model Heating issues and finally damaged.

"Heating Issue" is a pretty non-specific symptom. How hot is it in degrees (not your fingertip opinion)? Does the RPi boot to a desktop? Is it really a B+ or is it a 3B+...big difference. If you can get to a desktop, the command line code vcgencmd measure_temp will tell you how hot the cpu actually ...
by wh7qq
Thu Jun 07, 2018 2:07 am
Forum: Automation, sensing and robotics
Topic: Simple Auto Watering System (Hardware question)
Replies: 5
Views: 374

Re: Simple Auto Watering System (Hardware question)

You can purchase battery powered timed valves with hose connections for about the same or much less money as you would have to invest in an RPi/valve/power supply system: https://www.amazon.com/dp/B004INGS8S/ref=twister_B01N9UWHN7?_encoding=UTF8&th=1. If you have a big hardware store handy, like Hom...
by wh7qq
Wed Jun 06, 2018 7:01 pm
Forum: Troubleshooting
Topic: B+ pi suddenly stopped reading SD card and still not reading.
Replies: 6
Views: 170

Re: B+ pi suddenly stopped reading SD card and still not reading.

For the sake of troubleshooting, disconnect every thing from the RPi except mouse, keyboard and monitor and burn a fresh copy of Raspbian-latest to your uSD card using Etcher or something like it. If the RPi boots normally to a desktop, it is probably good and it is something else in your setup.
by wh7qq
Wed Jun 06, 2018 6:29 pm
Forum: General discussion
Topic: Taking spectra with NoIR camera v2, colour problem
Replies: 2
Views: 170

Re: Taking spectra with NoIR camera v2, colour problem

I have the old v1 version in both normal and NoIR and the normal color rendition is, as you would expect, crappy on the NoIR version. As I understand it, the main difference is that the normal camera has an IR filter and the NoIR has none. I don't think that has changed for the v 2 camera. It result...
by wh7qq
Wed Jun 06, 2018 6:16 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: RPI thermostat on high voltage HVAC
Replies: 3
Views: 152

Re: RPI thermostat on high voltage HVAC

You did not tell us your location...220 is not the same in US and most other places. In US, you have 3 lines for 220...L1 & L2 being the 2 opposite phases and N being the neutral or ground. It gets split at the breaker box into separate 110V bus bars with the same neutral. Ground is a separate line ...
by wh7qq
Wed Jun 06, 2018 5:25 pm
Forum: General discussion
Topic: Best solder sucker on Amazon?
Replies: 5
Views: 190

Re: Best solder sucker on Amazon?

Tough topic. I had one recently that sucked good...so much so that it shook my hand and disturbed the work. Then the stupid plastic tip broke off at the base...useless. It was a pretty blue anodized thing from "Steren".I am beginning to think that the only good ones have a small pump that pulls a va...
by wh7qq
Tue Jun 05, 2018 11:12 pm
Forum: Other projects
Topic: Suitable case for 3B+ and POE Hat
Replies: 2
Views: 327

Re: Suitable case for 3B+ and POE Hat

I have a 2B with an AudioInjector stereo sound card installed and had to resort to the High Pi case: https://www.amazon.com/gp/product/B016954T3I/ref=oh_aui_detailpage_o09_s00?ie=UTF8&psc=1. I had to do some surgery for the RCA sockets but it clears well otherwise. Other than its being in "basic bla...
by wh7qq
Tue Jun 05, 2018 10:53 pm
Forum: Troubleshooting
Topic: i can print in gui mode but can't print in command line mode
Replies: 3
Views: 126

Re: i can print in gui mode but can't print in command line mode

You may have several things at work here:

1. Many Debian based distros require installation of lpr using

Code: Select all

sudo apt install lpr
2, You may need to use lpr as root using "sudo".

Beyond these things, there are lots of references on search engines (Duck, Google, etc.) to "lpr linux"
by wh7qq
Tue Jun 05, 2018 1:55 am
Forum: Networking and servers
Topic: Raspberry Pi 3 B+ as PC WiFi Adapter
Replies: 1
Views: 120

Re: Raspberry Pi 3 B+ as PC WiFi Adapter

Check on amazon for the price of wifi adapters...pretty cheap. If you have to buy or adapt a cable to use an RPi., the adapter would be money well spent vs. the time and effort of adapting. The Panda PAU06 costs a whopping $15 US on Amazon and probably gives better performance than the hookup with a...
by wh7qq
Fri Jun 01, 2018 2:34 am
Forum: Troubleshooting
Topic: 3b+ HeaterMeter boot woes
Replies: 12
Views: 344

Re: 3b+ HeaterMeter boot woes

Are your power supplies able to provide the 2.5 Amps required by the 3B+? How much voltage drop do you get across the supply cable?

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