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by Paul Hutch
Thu Apr 26, 2018 7:47 pm
Forum: General discussion
Topic: Serial terminal apps for RPI
Replies: 4
Views: 7401

Re: Serial terminal apps for RPI

Minicom is the classic serial terminal program for *nix, IIRC the first release was in the mid 1990's and it's still maintained and updated today.
by Paul Hutch
Wed Apr 25, 2018 9:59 pm
Forum: General discussion
Topic: Using a PowerBoost 1000C as a UPS for my rpi3?
Replies: 6
Views: 1634

Re: Using a PowerBoost 1000C as a UPS for my rpi3?

I like the idea of using the Adafruit PowerBoost 1000 as a roll your own UPS for Pi's that aren't being taxed so hard that they draw lots of power. To make a complete system I'm thinking of buying the Adafruit 6600mAh battery and their 2.4A power supply which should make a complete, safe & functioni...
by Paul Hutch
Tue Apr 24, 2018 3:51 pm
Forum: General discussion
Topic: Help regarding accessories for 3 B+
Replies: 6
Views: 599

Re: Help regarding accessories for 3 B+

krisrajz wrote:
Tue Apr 24, 2018 1:27 pm
WiFi USB adapter with mouse.
I suspect you meant, wireless mouse with USB receiver, at least I've never heard of a WiFi adapter with a mouse or a WiFi connected mouse. Another possibility would be a WiFi USB adapter and a mouse.
by Paul Hutch
Tue Apr 24, 2018 3:23 pm
Forum: General discussion
Topic: Are Raspberry Pi and other microcontrollers scalable for commercial projects?
Replies: 13
Views: 1684

Re: Are Raspberry Pi and other microcontrollers scalable for commercial projects?

The Internet of Things Podcast had a good interview with an experienced embedded designer that is a good introduction to this space for the layman. This is the team you need to build a connected product https://staceyoniot.com/this-is-the-team-you-need-to-build-a-connected-product/ Being an experien...
by Paul Hutch
Tue Apr 24, 2018 1:22 am
Forum: Python
Topic: Power Off Button Interupt
Replies: 1
Views: 346

Re: Power Off Button Interupt

Links to the online examples you mention will help others give advice.
by Paul Hutch
Tue Apr 24, 2018 12:25 am
Forum: Advanced users
Topic: Powering multiple Pi Zero’s? (Again)
Replies: 23
Views: 2898

Re: Powering multiple Pi Zero’s? (Again)

See the rest of my reply for the general answer. ;) I was hoping for hard numbers rather than "general" hand waving. If you want hard numbers my employer and I could work them up for you but the cost would be $10,000+ paid up front (actually we have no free time is our schedules right now so we cou...
by Paul Hutch
Tue Apr 24, 2018 12:04 am
Forum: Advanced users
Topic: Help with reading output from digital pressure sensor
Replies: 7
Views: 1124

Re: Help with reading output from digital pressure sensor

I've never used any high pressure sensors with a RasPi but this forum thread recommends one that looks good.
viewtopic.php?t=183940#p1164072
by Paul Hutch
Fri Apr 20, 2018 4:15 pm
Forum: General discussion
Topic: Raspberry Pi 3 B+ has a much lighter green board
Replies: 4
Views: 698

Re: Raspberry Pi 3 B+ has a much lighter green board

Typically the solder mask color for a PCB is specified as only a basic color. (e.g. green, red, blue, purple)

On a price sensitive product like a RasPi I doubt they specify a particular shade of green, they just accept whatever shade is standard from the PCB fabricator to get the lowest cost.
by Paul Hutch
Fri Apr 20, 2018 3:24 pm
Forum: Advanced users
Topic: Powering multiple Pi Zero’s? (Again)
Replies: 23
Views: 2898

Re: Powering multiple Pi Zero’s? (Again)

Economics is why. What are the economics that make it prohibitive? I can't imagine any other solution that is cheaper than a couple rails to carry the current. Presumably it could actually be done with existing low voltage track lighting equipment, just with 5V instead of 10-24V. See the rest of my...
by Paul Hutch
Thu Apr 19, 2018 9:03 pm
Forum: Advanced users
Topic: Help with reading output from digital pressure sensor
Replies: 7
Views: 1124

Re: Help with reading output from digital pressure sensor

There is likely no way to get digital data, or a useful analog signal, out of the built-in pressure gauge, at least not without breaking the automatic inflation pressure feature. So think about adding an additional pressure sensor for the Pi to read and choose one that is Pi friendly.
by Paul Hutch
Thu Apr 19, 2018 8:58 pm
Forum: Advanced users
Topic: Powering multiple Pi Zero’s? (Again)
Replies: 23
Views: 2898

Re: Powering multiple Pi Zero’s? (Again)

I've got two words for you: Track Lighting My dream is to just have a rail that runs the length of my desk and from any point I can just attach the RPi (or similar USB device) I want to power. Some EE needs to explain why this kind of thing doesn't already exist. Economics is why. Not enough people...
by Paul Hutch
Thu Apr 19, 2018 8:26 pm
Forum: General discussion
Topic: Unpleasant new board smell ?
Replies: 68
Views: 12151

Re: Unpleasant new board smell ?

I recently opened a spare Pi3B I bought from Arrow Electronics in the USA last year when they had them discounted with free next day shipping. The G10/FR4 fiberglass PCB used on it is the variety that has a much more powerful fiberglass PCB smell than most G10/FR4 PCB's including the other Pi's I've...
by Paul Hutch
Thu Apr 19, 2018 7:09 pm
Forum: General discussion
Topic: Networking
Replies: 4
Views: 553

Re: Networking

I wish to network a number of Pi's together in such a manner that I can make use of the GPIO terminals e.g. an input into one Pi can be transmitted to a specified Pi or Pi's and initiate an output/s. It seems like what you want is more GPIO than a single RasPi can provide. If that is the case you s...
by Paul Hutch
Sat Apr 14, 2018 3:26 pm
Forum: General discussion
Topic: Heatsink required for Raspberry Pi 3 B+?
Replies: 59
Views: 62819

Re: Heatsink required for Raspberry Pi 3 B+?

A temperature of 50C/122F is generally accepted as too hot to touch That's no where near too hot to touch for me or anyone else I know IRL, I consume coffee and pizza at higher temperatures than that and have worked in attics for long periods at temperatures at and above that. I've measured and wor...
by Paul Hutch
Fri Apr 13, 2018 2:34 pm
Forum: General discussion
Topic: Heatsink required for Raspberry Pi 3 B+?
Replies: 59
Views: 62819

Re: Heatsink required for Raspberry Pi 3 B+?

Ok, so I have another RPI with not heat sinks, however in a case with a tiny little fan. rasp-no-heat-sink.png Just a few tasks , a couple of web sessions, live radio stream, one Skype session - temperature is bewten 30 - 40 C. Open a web session and watch video content - temp. jumps to 50. IIRC, C...
by Paul Hutch
Thu Apr 12, 2018 8:03 pm
Forum: General discussion
Topic: Heatsink required for Raspberry Pi 3 B+?
Replies: 59
Views: 62819

Re: Heatsink required for Raspberry Pi 3 B+?

Thanks for the clarification, is there an official link that would say heat sinks are not needed at all? https://www.raspberrypi.org/help/faqs/#performanceHeatsink You should not need to use a heatsink, as the chip used in the Raspberry Pi is equivalent to one used in a mobile phone, and should not...
by Paul Hutch
Wed Apr 11, 2018 6:11 pm
Forum: Advanced users
Topic: Multiple moisture sensors
Replies: 21
Views: 3264

Re: Multiple moisture sensors

Can you actually run multiples of that same sensor on the RPI and is there any sort of documentation or tutorials around on how to do it?? Yes, you can run as many of those sensors as you have inputs available, five is easy. Using up to thirteen of the sensors digital outputs would leave all the mu...
by Paul Hutch
Wed Apr 11, 2018 1:02 am
Forum: Advanced users
Topic: Multiple moisture sensors
Replies: 21
Views: 3264

Re: Multiple moisture sensors

Those sensors have two different outputs, analog and digital. The digital outputs can connect to GPIO pins and signal wet/dry. You just have to adjust the trimpots so that the digital outputs change at the wet/dry point you want. If you want to use the analog outputs to read a value for the moisture...
by Paul Hutch
Tue Apr 10, 2018 10:08 pm
Forum: Python
Topic: Infinite loop checking potentiometer
Replies: 40
Views: 4362

Re: Infinite loop checking potentiometer

Generally soldered connections, screw terminals, or tight gold connectors are required for long term reliable analog signals at high resolution. The key to knowing if that's what's needed is that when you exercise the connectors (disconnect/reconnect multiple times) the readings improve.
by Paul Hutch
Tue Apr 10, 2018 3:24 pm
Forum: Python
Topic: Raspberry Pi Light Detector
Replies: 35
Views: 12204

Re: Raspberry Pi Light Detector

A quick stylistic comment, all caps with underscores is usually reserved for constants, since you're changing the value of LED_BRIGHTNESS it is not a constant so should be lower case. Ref. https://www.python.org/dev/peps/pep-0008/#naming-conventions Of course as with everything in programming this i...
by Paul Hutch
Mon Apr 09, 2018 3:10 pm
Forum: Python
Topic: 100 % processing power
Replies: 15
Views: 1435

Re: 100 % processing power

You need a sleep in the "while True:" loops that will always execute on every pass through the loop to avoid 100% processor utilization. Your sleep statement are inside of conditional branches so will not always execute. I generally put it as the last statement in the loop because it makes a good vi...
by Paul Hutch
Mon Apr 09, 2018 2:58 pm
Forum: General discussion
Topic: Help with 4 channel relay (keyestudio)
Replies: 5
Views: 2618

Re: Help with 4 channel relay (keyestudio)

This is the best diagram I've found for converting WiringPi numbers to the BCM and hardware pin numbering schemes.
https://pinout.xyz/pinout/wiringpi
by Paul Hutch
Mon Apr 09, 2018 2:35 pm
Forum: General discussion
Topic: UART
Replies: 7
Views: 714

Re: UART

If you use a good old fashioned serial (modem) terminal programs on each side you can use their built-in file transfer capabilities. I've most often done this with Minicom on *nix and Tera Term on Windows. You start the file reception function on one side and then start the file send function on the...
by Paul Hutch
Mon Apr 09, 2018 2:27 pm
Forum: General discussion
Topic: SSH & FTP from particular WiFi not working
Replies: 3
Views: 376

Re: SSH & FTP from particular WiFi not working

The university WiFi may have a security configuration like my home guest network to stop CS majors from hacking other students devices. ;)

My guest network does not route between devices on the local network, communication is only allowed with devices outside of the local network.
by Paul Hutch
Sat Apr 07, 2018 12:58 am
Forum: Python
Topic: Pyserial ungraceful handling of disconnected USB serial adapter
Replies: 5
Views: 2057

Re: Pyserial ungraceful handling of disconnected USB serial adapter

I've never seen this happen but I may never have disconnected a USB serial adapter while it's in use. AFAIK pySerial uses the Windows API to communicate with COM ports so it seems more likely to be a Windows and/or USB driver issue. To make sure it's a pySerial only problem I'd see what happens if y...

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