Go to advanced search

by Paul Hutch
Sat Aug 25, 2018 1:08 pm
Forum: General discussion
Topic: Wirelessly charged Rpi Zero?
Replies: 14
Views: 1241

Re: Wirelessly charged Rpi Zero?

With an autonomous robot a that parks itself to charge, it is very easy to have the robot slide into a dock where Pogo pins, or other low force connectors, can provide bucket loads of power with near zero losses.
by Paul Hutch
Wed Aug 22, 2018 5:16 pm
Forum: General discussion
Topic: WHITE SCREEN LCD
Replies: 2
Views: 257

Re: WHITE SCREEN LCD

I just hit what I think is the same problem yesterday when I finally tried out a 5" HDMI display I bought from Adafruit a while ago (it's for a future project but saw it and decided I better check that it actually works). I plugged it in and it was all white then had streaks but no usable display. W...
by Paul Hutch
Wed Aug 22, 2018 5:08 pm
Forum: General discussion
Topic: Need help - pi power
Replies: 3
Views: 301

Re: Need help - pi power

Based on the data at your link I'd use the USB Hi Smart Output which will only provide 5V/2.4A. The USB QC3.0 Output should default to 5V/3A when you connect a RasPi, as pointed out by W. H. Heydt, but since it's extremely unlikely you'll ever need more that 2.4A I'd stick with using the port that c...
by Paul Hutch
Wed Aug 22, 2018 3:00 pm
Forum: Advanced users
Topic: Resize image for use on a smaller sd card
Replies: 34
Views: 91572

Re: Resize image for use on a smaller sd card

I find the simplicity of a whole image backup much more convenient, although inefficient with processor time and storage space. First time preparation, copy the PiShrink script to the Raspberry Pi you will use for making the copies. https://github.com/Drewsif/PiShrink Backup: Place uSD card in reade...
by Paul Hutch
Mon Aug 20, 2018 3:05 pm
Forum: Advanced users
Topic: [RTC] DS3231 clock calibration (doubts and trouble)
Replies: 4
Views: 721

Re: [RTC] DS3231 clock calibration (doubts and trouble)

There appear to be more counterfeit, decades old stock, and recycled DS3231's on the market now than new units. The chip alone sells for $4.00US in 1000 piece quantities so if a complete PCB, chip, capacitor, and resistors module sells for less than $10 in single piece quantities I'd be suspicious t...
by Paul Hutch
Mon Aug 20, 2018 2:31 pm
Forum: Advanced users
Topic: [Solved] serial port API documentation
Replies: 13
Views: 1508

Re: serial port API documentation

I think you will need to use lower level code to detect a break and depending on the hardware UART's architecture it may not be detectable. Break is simply a signal outside the limits set in the TIA-232 standard (above -3V and below +3V, like a break in the wiring will give). Some modern hardware UA...
by Paul Hutch
Sat Aug 18, 2018 1:31 pm
Forum: Networking and servers
Topic: Remote Desktop to windows performance. Zero W vs 3b+
Replies: 4
Views: 1340

Re: Remote Desktop to windows performance. Zero W vs 3b+

Never tried remote desktop but from a general horsepower perspective the 3B+ is closer in performance to a 10 year old Mac-Mini than it is to a ZeroW.
by Paul Hutch
Sat Aug 18, 2018 12:20 am
Forum: Advanced users
Topic: Floating input on industrial usage
Replies: 9
Views: 836

Re: Floating input on industrial usage

The symptom definitely seems like EMI pickup from the other gear. I'd start by removing the pull down resistor, turning on the internal pull up for the pin, and also add a low value external pull-up to 3.3V for improved noise immunity. I'd start with 1k for the external pull up and go lower if EMI i...
by Paul Hutch
Fri Aug 10, 2018 6:02 pm
Forum: General discussion
Topic: Access com port remotely while using PI as an access point
Replies: 8
Views: 551

Re: Access com port remotely while using PI as an access point

So part of the problem, I think, even with using SSH, is that the RPi no longer has an IP address per se once I have created the bridge from the coding in the link I provided. From the link you provided: If SSH is enabled on the Raspberry Pi access point, it should be possible to connect to it from...
by Paul Hutch
Tue Aug 07, 2018 6:07 pm
Forum: General discussion
Topic: Powering a USB hub from third-party 5V 2A solder pads
Replies: 10
Views: 597

Re: Powering a USB hub from third-party 5V 2A solder pads

That USB Hub is from Adafruit, your link is to a distributor. https://www.adafruit.com/product/961 The Adafruit page says its external power input is 5V @ 2A from a 110/120VAC adapter. So cutting the cord and hooking it up to a different 5V @ 2A power source should be fine. If you are unsure you can...
by Paul Hutch
Tue Aug 07, 2018 1:23 pm
Forum: General discussion
Topic: Opening a brick and mortar store in Orlando
Replies: 9
Views: 1085

Re: Opening a brick and mortar store in Orlando

As for the Target store suggestion, I visited our Target online store to find they had two in stock at that store. I visited their store and one employee had no idea what a Raspberry Pi was but found it should be on the shelf. After that rep contacted another because we couldn't find it, the other ...
by Paul Hutch
Sun Aug 05, 2018 1:52 pm
Forum: General discussion
Topic: Opening a brick and mortar store in Orlando
Replies: 9
Views: 1085

Re: Opening a brick and mortar store in Orlando

Another thing to consider is that the Pi3B is being sold by Target for $34.99 (with free shipping for $35 orders) and they often have one in stock at my local stores. So adding a markup to cover your shipping/handling/inventory holding costs may cause many potential customers to go to Target. https:...
by Paul Hutch
Sat Aug 04, 2018 4:58 pm
Forum: Advanced users
Topic: Resize image for use on a smaller sd card
Replies: 34
Views: 91572

Re: Resize image for use on a smaller sd card

AFAIK PiShrink only works with basic Raspbian images, it doesn't even work for RasPi NOOBS images.
by Paul Hutch
Sat Aug 04, 2018 4:38 pm
Forum: General discussion
Topic: Backup Without Copying the Entire Card
Replies: 6
Views: 1174

Re: Backup Without Copying the Entire Card

The standard advice given for backing up the Raspberry Pi is to make images of the entire SD card and store them on a Windows PC. While this method works, it has drawbacks. Upon backup, sectors on the SD card which do not hold data are copied and as well as data that hasn't changed since the last b...
by Paul Hutch
Sat Aug 04, 2018 4:22 pm
Forum: General discussion
Topic: Is it suitable? For a Computer Science course? [Fake post from spammer]
Replies: 21
Views: 1678

Re: Is it suitable? For a Computer Science course?

Heater wrote:
Sat Aug 04, 2018 3:59 pm
That is an interesting observation. So what is the the spammer clue in the name of our OP here "inetmktvn16" ?
Unfortunately no obvious clue to me, If you hadn't noticed the cut and paste, well spotted, I might have taken the bait and wasted time trying to reply to the OP here.
by Paul Hutch
Sat Aug 04, 2018 3:56 pm
Forum: General discussion
Topic: Need help looking for a particular style of case
Replies: 3
Views: 368

Re: Need help looking for a particular style of case

I have some plexiglass and access to a laser cutter (don't want to 3D print). Would prefer cutting this out of plexiglass and using screws and tiny nuts to hold it together. I need a case like this: https://github.com/diy-electronics/raspberrypi-b-plus-case BUT..... it needs to have an open slit .....
by Paul Hutch
Sat Aug 04, 2018 3:45 pm
Forum: General discussion
Topic: Is it suitable? For a Computer Science course? [Fake post from spammer]
Replies: 21
Views: 1678

Re: Is it suitable? For a Computer Science course?

I just noticed the username of the OP in the linked thread, seochris. I'm amazed that I and everybody else missed the obvious spammer name. A general rule for me, if any user name or web site name has SEO in it they are a spammer or scammer.
by Paul Hutch
Sat Aug 04, 2018 1:15 pm
Forum: Python
Topic: Serial problem
Replies: 10
Views: 622

Re: Serial problem

There are a quite a few details that aren't given that impact serial code. Does the RasPi have Bluetooth Do you have an overlay loaded to reassign Bluetooth to the mini-UART (These first two determine whether the port is named ttyAMA0 or ttyS0) Is there a jumper connecting Tx to Rx on the RasPi Is t...
by Paul Hutch
Fri Aug 03, 2018 11:58 pm
Forum: General discussion
Topic: Unpleasant new board smell ?
Replies: 68
Views: 10057

Re: Unpleasant new board smell ?

Paul, Have you been able to isolate the source of the smell. My board has noxious USB ports. Perhaps on yours it is elsewhere on the board. The USB smell is so strong that it reminds me of opening a pool tablets chlorine container. Mines the entire board, quite possibly it is very different to the ...
by Paul Hutch
Fri Jul 27, 2018 3:27 pm
Forum: General discussion
Topic: UL and Flammability rating for Raspberry Pi 3B+ [solved]
Replies: 20
Views: 1461

Re: UL and Flammability rating for Raspberry Pi 3B+

Our client explicitly wants it to be UL certified with the UL stamp. Industries typically want the UL stamp and certification (I'm not sure why). Ignorance and failing to keep up with US regulatory changes over the past 30 years. UL was the only place to go for many of the tests until the end of th...
by Paul Hutch
Thu Jul 26, 2018 6:32 pm
Forum: General discussion
Topic: UL and Flammability rating for Raspberry Pi 3B+ [solved]
Replies: 20
Views: 1461

Re: UL and Flammability rating for Raspberry Pi 3B+

When getting a quote be aware that there are alternatives to using UL. You can often save a good amount of money using one of the other Nationally Recognized Testing Laboratories (NRTLs). OSHA has a complete list at: https://www.osha.gov/dts/otpca/nrtl/nrtllist.html I'm partial to Curtis-Straus LLC ...
by Paul Hutch
Fri Jul 20, 2018 8:55 pm
Forum: Python
Topic: whats the meaning of getting "b' ' " in answer and how can I overcome it?
Replies: 4
Views: 541

Re: whats the meaning of getting "b' ' " in answer and how can I overcome it?

As bensimmo pointed out, the b indicates that the data is the bytes data type which pySerial uses for read/write. This is why you need the ".encode('utf-8')" in the write code line. IIRC, when reading you need to use ".decode("utf-8")" on the received bytes to convert back. Untested code modificatio...
by Paul Hutch
Fri Jul 20, 2018 8:24 pm
Forum: General discussion
Topic: We're looking at introducing more swag - what would you like to see?
Replies: 64
Views: 5685

Re: We're looking at introducing more swag - what would you like to see?

A Pi branded version of this uSD card holder. http://sdcardholder.com/micro-sd-card-holder-case.php I disagree on this point, I own two and the quality is not what I expected, what I mean is that sd cards easely drop out of the holder. The cards stay in nicely on all four of the ones I use. Althoug...
by Paul Hutch
Fri Jul 20, 2018 7:22 pm
Forum: General discussion
Topic: We're looking at introducing more swag - what would you like to see?
Replies: 64
Views: 5685

Re: We're looking at introducing more swag - what would you like to see?

A Pi branded version of this uSD card holder. http://sdcardholder.com/micro-sd-card-holder-case.php

The customization service allows custom colors, logo and printing, maybe two versions, Pi red and Pi green.

Go to advanced search