How can i make a 5 watt adapter from 120v AC power switch.

I'm making a fixture for a tablet and I want to make a charging adapter that I can attach to the (hot/neutral) screws on the back of a receptacle that will have a USB Mini-b (5-pin) on the other end. What do I need to go between the two? I've thought about breaking a wall wart apart and modifying it, but would rather learn to make one. Thanks! -John

Asked by BANTAR1000 9 hours ago

Can i charge 3 18650 li ion batteries in series?

I recently take an old laptop battery a part and found 3 x "packs" of 3 x 18650 cells.I disconnected each pack and i was wondering,can i charge "the pack" using a TP4056 charger?(the charging current is 1A)l;(I want to make a portable console,so i need rechargeble batteries)This is the charger that i orderd:

Asked by AnghelutaA 10 hours ago

How to switch 12VDC 1.5 amps and 0.3 amps

Hi :)I have to switch some fans on and off electrically but I don't really know how to do it.. I wanted to use MOSFET but is it a good idea ? If yes, which models ? I already worked with relays but it seems to be an "overkilled" solution for this application :p As writen in the title, one will be used with 1.5amps and the other with 0.3amps (12VDC both).Thanks :)

Asked by QuentinP16 16 hours ago


Asked by suzans12 on How to Put Up a Dome Tent 22 hours ago

BUGS again

I posted a topic re bugs I see.I am told it has been published and can be seen "here" but It is NOT in the topic list.

Posted by rickharris 23 hours ago


1. Legitimate requests for support that are not related to any instructable are no longer shown.2. There is no way to submit such a question other than as a general forum topic mixed in with everything else.3. There is no way to separate "answered" topics from others,4. Everything is sorted by recent - If I want to see if my "topic" was answered I have to scroll through many many topics to find it.5. although there is a small box above to identify this as a question - Not many will see it, what does it do, in principle it looks useful.

Asked by rickharris 23 hours ago

Can an old smartphone be repurposed?

Hello and my heartiest greetings to all reading this,I have this old Nokia Lumia 540 and was wondering whether I could replace the OS with something like the Raspbian to use it with python and utilize all the cool stuff already there in the phone. Is that sort of thing possible?I am totally new to this stuff and hence have no idea about any of it. Please help me out.Cheers. :)

Asked by Bhabeshr 1 day ago

Launch statistics

My launch statics appear to have disappeared, or are they in a new location?I find the graphs helpful ...

Posted by lingib 1 day ago


Hi ordered LED light strips (16 foot ) we cut them to fit the back of out tv we cut in correct area now the lights won't change color or turn off ...and when they do we can chang ro like one two 3 colors the it stops

Asked by Mrsmonrow12 1 day ago

Arduino IDE Problems with Uploading

Recently I've been having problems uploading sketches to the Arduino UNO and receiving the following error message. I have tried many different types of the IDE, checked my ports, boards, etc. If someone could help me fix this it would be greatly appreciated!Arduino: 1.8.5 (Windows Store (Windows 10), Board: "Arduino Uno"WARNING: Category '' in library SPI is not valid. Setting to 'Uncategorized' WARNING: Category '' in library SoftwareSerial is not valid. Setting to 'Uncategorized' WARNING: Category '' in library Wire is not valid. Setting to 'Uncategorized' WARNING: Category '' in library Ethernet2 is not valid. Setting to 'Uncategorized' Warning: platform.txt from core 'Arduino AVR Boards' contains deprecated compiler.path={runtime.ide.path}/hardware/tools/avr/bin/, automatically converted to compiler.path={}/bin/. Consider upgrading this core. Warning: platform.txt from core 'Arduino AVR Boards' contains deprecated tools.avrdude.cmd.path={runtime.ide.path}/hardware/tools/avr/bin/avrdude, automatically converted to tools.avrdude.cmd.path={path}/bin/avrdude. Consider upgrading this core. Warning: platform.txt from core 'Arduino AVR Boards' contains deprecated tools.avrdude.config.path={runtime.ide.path}/hardware/tools/avr/etc/avrdude.conf, automatically converted to tools.avrdude.config.path={path}/etc/avrdude.conf. Consider upgrading this core. Warning: platform.txt from core 'Arduino AVR Boards' contains deprecated"{compiler.path}{}" {} {} "{build.path}/{archive_file}" "{object_file}", automatically converted to"{compiler.path}{}" {} {} "{archive_file_path}" "{object_file}". Consider upgrading this core. Sketch uses 1634 bytes (5%) of program storage space. Maximum is 32256 bytes. Global variables use 186 bytes (9%) of dynamic memory, leaving 1862 bytes for local variables. Maximum is 2048 bytes. Cannot run program "{path}/bin/avrdude": CreateProcess error=2, The system cannot find the file specified at java.lang.ProcessBuilder.start( at at cc.arduino.packages.Uploader.executeUploadCommand( at cc.arduino.packages.uploaders.SerialUploader.uploadUsingPreferences( at cc.arduino.UploaderUtils.upload( at at at$ at Caused by: CreateProcess error=2, The system cannot find the file specified at java.lang.ProcessImpl.create(Native Method) at java.lang.ProcessImpl.( at java.lang.ProcessImpl.start( at java.lang.ProcessBuilder.start( ... 8 more An error occurred while uploading the sketchThis report would have more information with "Show verbose output during compilation" option enabled in File -> Preferences.Thanks, Matt

Asked by Matt M 1 day ago

Arduino IDE not uploading properly

I'm having a problem with my Arduino IDE where I can't upload my programs. I have tried multiple version: 1.6.9, 1.6.13, 1.8.4, 1.8.5 but the problem is always there. To test each version I used a test program that should have said "Hi" in the serial monitor, but every test resulted in the following errors:If someone could please help me fix this problem, it would be grately appreciated!Thanks, Matt

Asked by Matt M 1 day ago

Which one should i use for my Project? Arduino Pro Micro Or SparkFun SAMD21 Mini Breakout?

Hello everyone, As the title, I'm just wondering which one i should choose to do my project - Arduino Pro Micro Or SparkFun SAMD21 Mini Breakout. I'm a student, and i'm going to do my own smartwatch. It only has OLED display, the pulse sensor and SMS/Wifi module inside. I've read the documents about both, it both has a small-size and low-power as i expected, but i have no experience to make sure which one is suitable for my smartwatch. If there's someone who did do the similar project before, please give me some advices. You can suggest another micro if they're better than mine. Please help me.Thanks a lot.

Posted by RooneyR1 1 day ago