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by piglet
Wed Nov 28, 2018 9:51 pm
Forum: Other projects
Topic: Controlling Christmas lights of different voltages - common ground OK?
Replies: 6
Views: 232

Re: Controlling Christmas lights of different voltages - common ground OK?

Yuup. It works with the extra 5v supply, common ground. All the hardware is working as intended.

Now to complete the code.
by piglet
Wed Nov 28, 2018 3:30 pm
Forum: Other projects
Topic: Controlling Christmas lights of different voltages - common ground OK?
Replies: 6
Views: 232

Re: Controlling Christmas lights of different voltages - common ground OK?

Thanks, Yes, I'm switching at the ground end on the led strip. I had come to the conclusion that I did have to make a common ground. Otherwise there's no way for the MOSFET to know when the Pi GPIO signal is high or low as that can only be by reference to the ground. Learning stuff all the time. I l...
by piglet
Wed Nov 28, 2018 12:00 pm
Forum: Other projects
Topic: Controlling Christmas lights of different voltages - common ground OK?
Replies: 6
Views: 232

Controlling Christmas lights of different voltages - common ground OK?

I'm currently using some IRLB8721 MOSFETs off three GPIOs to control a 12v led strip. The 12v supply's ground is connected to the Pi's ground. Sort of like this, but using a Pi (this is the clearest wiring diagram I could find): https://learn.adafruit.com/rgb-led-strips/usage If I want to add into t...
by piglet
Tue Nov 20, 2018 9:54 pm
Forum: Advanced users
Topic: Broken Gpio
Replies: 13
Views: 706

Re: Broken Gpio

You've not given enough detail for anyone to assist you.

It would help if you posted the schematic you're using.
by piglet
Fri Oct 05, 2018 10:34 am
Forum: General discussion
Topic: "Unfortunately, I do not have a scope, nor does anybody I know."
Replies: 12
Views: 594

"Unfortunately, I do not have a scope, nor does anybody I know."

Unfortunately, I do not have a scope, nor does anybody I know. The only tool I do have, is a digital multimeter my uncle gave me. I read this today and I totally relate to it. Any time I try and build something and run in to problems I do a search on the internet... Actually, I should rephrase that...
by piglet
Fri Sep 28, 2018 10:25 pm
Forum: Other projects
Topic: Lookign for some advise on best way to proceed - synchronisation/remote control
Replies: 5
Views: 374

Re: Lookign for some advise on best way to proceed - synchronisation/remote control

MQTT is new to me. Wow! It sure makes life easy for you to get connectivity. Thanks for the recommendation. That lets me concentrate on getting the functionality I need rather than messing about with socket programming like I thought I might have to. https://www.dropbox.com/s/rxdj9qw1qgsr0lk/mqtt.JP...
by piglet
Fri Sep 28, 2018 2:07 pm
Forum: Other projects
Topic: Lookign for some advise on best way to proceed - synchronisation/remote control
Replies: 5
Views: 374

Lookign for some advise on best way to proceed - synchronisation/remote control

Hi, I have a server raspberry pi (3b). It has a lot of things running on it including a web server. I have some Perl scripts on the server providing a UI to the settings on remote hardware The remote hardware is a range of other things - Raspberry Pi, ESP32 and ESP8266 which periodically poll a Perl...
by piglet
Mon Aug 20, 2018 1:21 pm
Forum: Beginners
Topic: can't boot PI3 after dropping the heat sink onto the board by accident
Replies: 16
Views: 531

Re: can't boot PI3 after dropping the heat sink onto the board by accident

You and your son have our sympathy. If re-flashing the sd card doesn't help it's likely there's nothing to be done but to replace the board. I doubt there's anyone here who's done much with electronics who hasn't had an accident at some point which has broken something. I made my once-only mistake w...
by piglet
Mon Aug 20, 2018 1:11 pm
Forum: Off topic discussion
Topic: What was your 1st game?
Replies: 49
Views: 14200

Re: What was your 1st game?

"Skiing" game - typed in line by line from a paper magazine to a 1K ZX81 machine. You had to "steer" the blob left and right through a series of blobs marking a ski course by pressing left and right buttons. Quickly followed by "let's see how I can change the code to make it more fun". There was no ...
by piglet
Mon Jul 23, 2018 3:20 pm
Forum: General discussion
Topic: Wifi adapter that actually works out of the box
Replies: 9
Views: 1481

Re: Wifi adapter that actually works out of the box

Official Raspberry Pi WiFi dongle https://www.raspberrypi.org/products/usb-wifi-dongle/ and Edimax N150/EW-7811UN (RTL8188CUS chipset) Your link doesn't work. Try: https://www.raspberrypi.org/products/raspberry-pi-usb-wifi-dongle/ Which is supposed to direct you to http://uk.rs-online.com/web/gener...
by piglet
Mon Jul 23, 2018 1:19 pm
Forum: General discussion
Topic: We're looking at introducing more swag - what would you like to see?
Replies: 62
Views: 2957

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

T shirts less garish, with logo not central but to the left; possibly more likely to appeal to the less extrovert, which to be honest is probably more the market here!
by piglet
Mon Jul 23, 2018 10:09 am
Forum: General discussion
Topic: We're looking at introducing more swag - what would you like to see?
Replies: 62
Views: 2957

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

How about a soft raspberry pi rainbow unicorn? ...they come up every time someone mentions Pi 4+ so would be nice to be able to buy one.
by piglet
Thu Jul 19, 2018 1:54 pm
Forum: Troubleshooting
Topic: Pi Zero woes
Replies: 2
Views: 181

Re: Pi Zero woes

1) Why an OTG adapter?

2) Try the latest raspbian rather than noobs
by piglet
Mon Jul 16, 2018 8:34 am
Forum: Automation, sensing and robotics
Topic: Is it possible to read the value of a UK dimmer switch with Raspberry Pi?
Replies: 21
Views: 860

Re: Is it possible to read the value of a UK dimmer switch with Raspberry Pi?

Sounds to me like the OP is asking whether a dimmer switch can be used as/like a rotary encoder; not necessarily anything to do with mains voltages (I sure hope)
by piglet
Thu Jul 12, 2018 10:28 am
Forum: General discussion
Topic: Thinking of writing a technical FAQ
Replies: 53
Views: 1831

Re: Thinking of writing a technical FAQ

Which FAQ area are you thinking about adding to? A new technical faq at the root of the docs tree. I'm sure this must be very familiar to you - but I've never seen this before. It's not easily found by any new person likely to need to know the information. I can't see any mention of "github" on the...
by piglet
Tue Jul 10, 2018 1:28 pm
Forum: General discussion
Topic: Thinking of writing a technical FAQ
Replies: 53
Views: 1831

Re: Thinking of writing a technical FAQ

Which FAQ area are you thinking about adding to?

The only obvious one is the main site "help" area https://www.raspberrypi.org/help/

or, possibly if you get as far as here the forum FAQ one: app.php/help/faq
by piglet
Mon Jul 09, 2018 8:09 am
Forum: Troubleshooting
Topic: Power through 5v GPIO
Replies: 3
Views: 179

Re: Power through 5v GPIO

However doing that you will bypass the polyfuse that gives you a certain amount of protection.
by piglet
Fri Jun 29, 2018 3:01 pm
Forum: Automation, sensing and robotics
Topic: Anti-mosquito laser turret - requesting circuit design help
Replies: 28
Views: 9684

Re: Anti-mosquito laser turret - requesting circuit design h

Killing mosquitoes one by one is surely more ecological than the Swedish invention to put a small layer of oil on top of your grill and leave it on a low temperature for the night. It kills mosquitoes by the thousands every night. They get attracted to heat and carbon dioxide. http://www.svtstatic....
by piglet
Thu Jun 28, 2018 8:49 am
Forum: General discussion
Topic: Forum : google analytics - grinding to a halt
Replies: 18
Views: 964

Re: Forum : google analytics - grinding to a halt

I was more concerned about the fact it's causing pages not to load and general slowness. My question was why is this script even on the page? Someone said to block the script. I've now added it to adblock plus - but I have a feeling I did this before and it caused problems on other sites. [edit] Tha...
by piglet
Wed Jun 27, 2018 3:15 pm
Forum: General discussion
Topic: Forum : google analytics - grinding to a halt
Replies: 18
Views: 964

Forum : google analytics - grinding to a halt

It's making the forum grind to a halt on my PC. Why does it need to be there? <script> (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parent...
by piglet
Tue Jun 19, 2018 10:15 am
Forum: Other projects
Topic: Installing an Adafruit's PDM MEMS Microphone on a Raspberry Pi 3 in order to study the behaviour of bees in a hive
Replies: 2
Views: 398

Re: Installing an Adafruit's PDM MEMS Microphone on a Raspberry Pi 3 in order to study the behaviour of bees in a hive

You didn't say which you've got. I2S needs some work to get going.

See: https://learn.adafruit.com/adafruit-i2s ... g-and-test

If it's a different board, then you may need to use other instructions!
by piglet
Mon Jun 18, 2018 12:39 pm
Forum: General discussion
Topic: Max Amps?
Replies: 10
Views: 1043

Re: Max Amps?

I never know how you're supposed to make supplies like that safe. You'd have thought it was easy but took a lot of looking for an enclosure when I got one, and it was was fugly and cost more than the actual transformer....
by piglet
Mon Jun 18, 2018 8:16 am
Forum: Beginners
Topic: Binary Blob?
Replies: 6
Views: 591

Re: Binary Blob?

It's basically the bits that other manufactures also have - but shove into firmware areas of their hardware so it's not so obvious. It's nothing to worry about.
by piglet
Wed Jun 13, 2018 3:47 pm
Forum: Raspbian
Topic: Raspbian + Pi3B+ = low voltgae warning?
Replies: 4
Views: 445

Re: Raspbian + Pi3B+ = low voltgae warning?

alphanumeric wrote:
Wed Jun 13, 2018 2:50 pm
Power supply is 5V at 10A.
See comments here

Most likely the cable, or the supply not really being what it says it is.

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