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by Paul Hutch
Fri Nov 16, 2018 11:08 am
Forum: General discussion
Topic: STICKY: Pi 3 A+
Replies: 132
Views: 40618

Re: STICKY: Pi 3 A+

RaTTuS wrote:
Fri Nov 16, 2018 8:30 am
https://www.newark.com/raspberry-pi/ras ... dp/81Y5333
is what I find there ...
That's a Pi1A+.
by Paul Hutch
Fri Nov 16, 2018 1:34 am
Forum: General discussion
Topic: STICKY: Pi 3 A+
Replies: 132
Views: 40618

Re: STICKY: Pi 3 A+

I think someone needs to have a little chat with Premier Farnell as this https://www.newark.com/raspberry-pi/rpi3-modap/sbc-raspberry-pi-3-model-a-512mb/dp/80AC9303 page shows the Pi3A+ with a price of $47.30. Since it's a US site, that's without taxes. It looks like Newark is trying to move the ov...
by Paul Hutch
Sun Nov 04, 2018 11:46 pm
Forum: Advanced users
Topic: Enable remote login via USB Serial on first boot and after updates.
Replies: 6
Views: 1399

Re: Enable remote login via USB Serial on first boot and after updates.

will serial login work without any extra equipment? If the machine you want to connect the RasPi to has 3.3V TTL asynch serial I/O, then no extra hardware needed. For most PC's you'll need either a 3.3V TTL to USB or 3.3V TTL to TIA-232 adapter board. BTW It appears PM's aren't enabled right now, p...
by Paul Hutch
Thu Nov 01, 2018 5:46 pm
Forum: Advanced users
Topic: Enable remote login via USB Serial on first boot and after updates.
Replies: 6
Views: 1399

Re: Enable remote login via USB Serial on first boot and after updates.

Check out this thread for info on getting a USB Serial Adapter console login at boot. https://www.raspberrypi.org/forums/viewtopic.php?t=177728 This thread, https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=177076&p=1129209#p1129209, and the article it references, http://0pointer.de/blog/proje...
by Paul Hutch
Thu Nov 01, 2018 4:30 pm
Forum: General discussion
Topic: senseHat not detected on raspberry pi 3 model B
Replies: 3
Views: 176

Re: senseHat not detected on raspberry pi 3 model B

If you didn't do them already, you need to do the installation steps. https://www.raspberrypi.org/documentation/hardware/sense-hat/ Not on a standard Raspbian Full install (for quite a few years). Other setups may need that. Thanks, I didn't know the Foundation's instructions were so far out of dat...
by Paul Hutch
Thu Nov 01, 2018 3:38 pm
Forum: General discussion
Topic: senseHat not detected on raspberry pi 3 model B
Replies: 3
Views: 176

Re: senseHat not detected on raspberry pi 3 model B

If you didn't do them already, you need to do the installation steps.
https://www.raspberrypi.org/documentati ... sense-hat/
by Paul Hutch
Wed Oct 24, 2018 4:02 pm
Forum: General discussion
Topic: Error while installing pip
Replies: 8
Views: 1219

Re: Error while installing pip

Oops never mind in case you saw the first version of my post.

The 169.254.53.216 address is a link-local address which indicates you are not connected to a DHCP capable router on your LAN.
by Paul Hutch
Fri Oct 19, 2018 1:07 pm
Forum: General discussion
Topic: Connectivity problem on Pi 3 Model B
Replies: 5
Views: 384

Re: Connectivity problem on Pi 3 Model B

You should only ever use the designated private address ranges for your self assigned static IP addresses. Using any Internet routable addresses like 123.123.201.101 will very often lead to networking problems. See here for a list of allowed private addresses. https://en.wikipedia.org/wiki/Private_n...
by Paul Hutch
Fri Oct 19, 2018 1:00 pm
Forum: General discussion
Topic: Raspbian install not working
Replies: 2
Views: 276

Re: Raspbian install not working

Seems like it's either a bad uSD card or a bad copy or burn of Raspbian on the card. Try downloading a fresh copy of Raspbian and creating a new uSD. If that works then try putting the fresh copy of Raspbian on the old uSD card and see if that works, if it does you had a bad download or burn, if it ...
by Paul Hutch
Fri Oct 19, 2018 10:37 am
Forum: General discussion
Topic: SD card write count?
Replies: 15
Views: 1262

Re: SD card write count?

The table in your link says that "industrial" grade cards have wear leveling, but "consumer" grade cards do not. Edit: it actually says "advanced wear leveling", maybe the consumer cards have something basic. My understanding from professionally designing with FLASH for decades, especially raw FLAS...
by Paul Hutch
Thu Oct 18, 2018 3:03 pm
Forum: General discussion
Topic: In search of reliable FCC-certified USB Wi-Fi adapter with removable antenna
Replies: 21
Views: 1508

Re: In search of reliable FCC-certified USB Wi-Fi adapter with removable antenna

... If I were their competitor and I wanted to play dirty pool, it would be super easy. Just put in a report to the FCC that their adapter is causing interference and sit back and watch the fireworks. Big no-no, and quite a risky one at that. No need to say that it interferes, simply say it is not ...
by Paul Hutch
Thu Oct 18, 2018 2:27 pm
Forum: General discussion
Topic: Howto set partition to a specific size after installation rather than filling whole SD card
Replies: 3
Views: 299

Re: Howto set partition to a specific size after installation rather than filling whole SD card

I run Drew Bonasera's PiShrink script after creating a dd image to shrink the image a small as possible which allows putting it on a smaller uSD card. The script also adds the commands to re-size the partition to fill up the new card on reboot. https://github.com/Drewsif/PiShrink In addition to usin...
by Paul Hutch
Mon Oct 01, 2018 11:37 pm
Forum: General discussion
Topic: 5 volts 5 amps power supply on raspberry pi 3 model b+
Replies: 14
Views: 1320

Re: 5 volts 5 amps power supply on raspberry pi 3 model b+

I would suggest a ~2.5A fuse between the Pi and the PSU and at least 17AWG wire (so the fuse blows before the wire melts) A fuse is definitely a great idea. Wire melting (fusing) is not a concern as long as the wire is at least 34AWG copper, although it would get fire starting hot (used to do it on...
by Paul Hutch
Fri Sep 28, 2018 2:52 pm
Forum: General discussion
Topic: Recommended way to backup SD card image under Windows?
Replies: 7
Views: 598

Re: Recommended way to backup SD card image under Windows?

I use this other PiShrink and love it. I dd the image on a RasPi with a USB uSD card reader and USB HDD for storing the images. Then I run Drew's shell script which shrinks the image and adds code to auto-expand the file system on first boot.
https://github.com/Drewsif/PiShrink
by Paul Hutch
Thu Sep 27, 2018 6:02 pm
Forum: Python
Topic: Python 3.x as standard
Replies: 25
Views: 2314

Re: Python 3.x as standard

I would like to see a bitter GUI maker than tkinker, I am trying wxpython but am having installation problem on the RPi, but the output in the docs. looks professional. I started using Python only about a year ago and very quickly abandoned Tkinter and wxPython. I like PyQt best for writing cross p...
by Paul Hutch
Thu Sep 20, 2018 7:22 pm
Forum: Advanced users
Topic: batterry powered Pi in hot areas
Replies: 6
Views: 1061

Re: batterry powered Pi in hot areas

AFAIK there are no standard battery types that can be charged above about 45°C. NiMH, NiCad and LiPO all can be discharged at up to 60°C and there are some high temp NiMH & NiCad good for up to 70°C. If I was looking to solve this I think I'd probably just make sure the battery never gets charges wh...
by Paul Hutch
Thu Sep 20, 2018 1:24 pm
Forum: General discussion
Topic: Ethernet switch with 8 ports and PTP
Replies: 8
Views: 913

Re: Ethernet switch with 8 ports and PTP

Assumptions I've made do to unclear question: PTP = Peer to Peer 100 Mbps Ethernet copper (I can't imagine anyone paying for 100M fiber) Extension board = Raspberry Pi Hat For that I don't know of any that are available. However for a 100Mbps peer to peer LAN containing a Pi you can use pretty much ...
by Paul Hutch
Mon Sep 17, 2018 3:14 pm
Forum: General discussion
Topic: MCP3008 readings
Replies: 163
Views: 7799

Re: MCP3008 readings

Change ACS712_VOffset to 2.57 into the scrip ACS712_VOffset = 2.57 But, I suspect that your multimeter is not exact to calculate the resistor. both 4k7 and 10K display the same value in 2 digits. Really need 3 digits. To verify if our calculation is correct you should use a voltmeter and measure wi...
by Paul Hutch
Fri Sep 14, 2018 5:54 pm
Forum: General discussion
Topic: MCP3008 readings
Replies: 163
Views: 7799

Re: MCP3008 readings

I did the experiment with 5 ohms 10 ohms and 20 ohms resistor with 5V at 2 A supply But the three resistor were burnt after few second For a 5V supply: 5 ohm load = 1A = 5 Watts 10 ohm load =0.5A = 2.5 Watts 20 ohm load = 0.25A = 1.25 Watts A rule of thumb I use is that the power rating for a load ...
by Paul Hutch
Tue Sep 11, 2018 3:55 pm
Forum: General discussion
Topic: Getting Live Voltage data from Pi 3B+
Replies: 8
Views: 424

Re: Getting Live Voltage data from Pi 3B+

I see, so the following setup would be what I am looking at? Charger -> Pi -> LM385 -> A2D -> Display Module The connections are more like: Charger +-> Pi power input +-> LM385 circuit -> A2D reference voltage input (constant V) +-> voltage divider -> A2D measurement voltage input (variable V) A2D ...
by Paul Hutch
Tue Sep 11, 2018 3:31 pm
Forum: General discussion
Topic: Commercial use and capability of Pi 3B+ for making BLE enabled industrial IoT gateway?
Replies: 10
Views: 2279

Re: Commercial use and capability of Pi 3B+ for making BLE enabled industrial IoT gateway?

If we make only enclosure for that board can we sell it in US with this already certified model? Thanks... If all you are doing is bundling items currently avaialable at retail in the USA with a custom mechanical housing, then you do not need any additional certification. For examples see Adafruit,...
by Paul Hutch
Tue Sep 11, 2018 2:04 pm
Forum: General discussion
Topic: Struggling to get an ADC working
Replies: 6
Views: 398

Re: Struggling to get an ADC working

i dont understand y doesn'the rpi3 have an ADC? Fairly straigh forward question, does anybody know why the rpi3 doesn't have an ADC. The rpi 3 board allows to communicate via UART, SPI, I2C even has 4 USB ports, and many other ubiquitous features. Yet, it doesn't have an ADC, which I guess would co...
by Paul Hutch
Sat Sep 08, 2018 4:21 pm
Forum: General discussion
Topic: MCP3008 readings
Replies: 163
Views: 7799

Re: MCP3008 readings

Like I told you before, your sensor is working just fine . Your sensor can measure +/- 30A. So, effectieve it can measure 60A and you want to measure a current of 0.0025A (5/2000). That is roughly 0.0042% of what the sensor can measure. This means that the output voltage will change: 0.0025 * 66mV ...
by Paul Hutch
Sat Sep 08, 2018 1:24 pm
Forum: General discussion
Topic: MCP3008 readings
Replies: 163
Views: 7799

Re: MCP3008 readings

I am measuring output of acs sensor with multimeter. input voltage is 5v DC. and the output of acs is 2.5 V If I connect 10 K load and measure output voltage of acs it gives 2.5 V I think if i connect load at output, voltage of ACS should be change but It doesn't happen in my case I have been check...
by Paul Hutch
Tue Aug 28, 2018 2:31 pm
Forum: Advanced users
Topic: Unsolder wi-fi chip and antenna in RPI3
Replies: 47
Views: 3596

Re: Unsolder wi-fi chip and antenna in RPI3

It seems unlikely that removing the power and antenna from the WiFi chip while leaving the data and other circuits connected would increase electromagnetic interference. While it seems unlikely, so do many other unintentional radiation problems. I've had a 4" PCB trace and 2N3904 cause a problem in...

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