Search found 91 matches

by theropod
Sat May 26, 2018 6:40 am
Forum: SparkFun Product Questions
Topic: SparkFun Sunny Buddy doesn't charge more than 4v
Replies: 4
Views: 47

Re: SparkFun Sunny Buddy doesn't charge more than 4v

What is the supply voltage from the outside source (not ac charger)? There may not be a high enough power factor in your alternate (solar?) to make the battery rise to 4.2 volts.
by theropod
Sat Feb 03, 2018 9:27 am
Forum: Arduino
Topic: Testing if a 230v AC circuit is closed
Replies: 5
Views: 191

Re: Testing if a 230v AC circuit is closed

Wrap a wire around one “leg” of a hot line and produce induction?
by theropod
Wed Jan 31, 2018 5:10 pm
Forum: SparkFun Product Questions
Topic: Cutting the trace on 5v to 3.3v
Replies: 10
Views: 653

Re: Cutting the trace on 5v to 3.3v

One small issue. Nobody “silkscreens” anything anymore. All screen printing is done with manmade fibers these days, and the tern “silkscreening” is out of date.
by theropod
Thu Jan 04, 2018 6:36 pm
Forum: Projects
Topic: Soldering tab-style connectors with holes
Replies: 4
Views: 275

Re: Soldering tab-style connectors with holes

I put a small bend in the wire so that it passes through the hole and then lays flat along the component lead. To me this provides a larger contact area for both current flow and mechanical connection strength.
by theropod
Mon Dec 18, 2017 4:22 am
Forum: Arduino
Topic: General Questions about an Arduino
Replies: 2
Views: 252

Re: General Questions about an Arduino

The Arduino will retain the programming and start/run the sketch when powered up.
by theropod
Wed Dec 06, 2017 10:20 am
Forum: Projects
Topic: Wind turbine disconnect
Replies: 1
Views: 158

Re: Wind turbine disconnect

Is this a grid tied turbine?
by theropod
Wed Nov 29, 2017 10:24 am
Forum: Projects
Topic: Electrolysis Rust Removal
Replies: 2
Views: 217

Re: Electrolysis Rust Removal

I am using soft steel rods very similar to rebar. A old tire iron, a spit from a long gone BBQ and a soft steel rod from a dead injet printer. No chrome and no stainless steel. I have also tested old web wire fencing and it works but is hard to clean off the gunk that collects as the process goes on...
by theropod
Tue Nov 28, 2017 6:02 pm
Forum: Projects
Topic: Electrolysis Rust Removal
Replies: 2
Views: 217

Electrolysis Rust Removal

Hey all, I am restoring an early serial number 1938 Allis Chalmers model B tractor. The sheet metal is in terrible condition with rust and dead paint. I have been using direct current via a small 12 volt battery charger (<10amps) and employing electrolysis to dissolve the rust and loosen the paint. ...
by theropod
Tue Nov 14, 2017 4:00 pm
Forum: General Chit Chat
Topic: espcomm errors after updating to macOS 10.13.1 High Sierra
Replies: 1
Views: 1591

Re: espcomm errors after updating to macOS 10.13.1 High Sierra

It is very much the Mac OS update causing this issue. Do a net search for the correct USB driver that will work with the Ardunio IDE and High Sierra, as a dime against a dollar says Apple has limited the USB porting in the last update. Apple has turned into control freaks dictating what users can an...
by theropod
Wed Nov 08, 2017 5:48 am
Forum: Projects
Topic: replace SPDT with button and indicator
Replies: 4
Views: 227

Re: replace SPDT with button and indicator

Alternatively a simple flip flop circuit could do this, like a 4013. An either-or state is what flip flops do.

http://www.learningaboutelectronics.com ... ircuit.php
by theropod
Wed Nov 08, 2017 4:27 am
Forum: Projects
Topic: replace SPDT with button and indicator
Replies: 4
Views: 227

Re: replace SPDT with button and indicator

Excellent use of the decade counter! I think the OP wanted a single push button to select one of two conditions, unless I read it wrong. This would just require two output pins from the 4017, with self reset enabled, and use the pulse to the counter from the push button to toggle back and forth betw...
by theropod
Sat Nov 04, 2017 4:11 am
Forum: Projects
Topic: replace SPDT with button and indicator
Replies: 4
Views: 227

Re: replace SPDT with button and indicator

Hey, If you are planning on driving this application with an Arduino it is a simple thing. Your code should look to turn on an output pin when the first button push is enacted. When the second button push is encountered that pin is turned off and a second output pin is activated. The loop would cons...
by theropod
Sat Oct 14, 2017 5:58 pm
Forum: Arduino
Topic: Need help with Arduino and Steppers with EasyDriver!
Replies: 2
Views: 337

Re: Need help with Arduino and Steppers with EasyDriver!

Your easy drivers are probably toast. They require a 5V supply and a different voltage for the stepper driver side.
by theropod
Fri Sep 22, 2017 5:07 pm
Forum: Projects
Topic: Retrofitting old analog tachometer to another engine
Replies: 5
Views: 480

Re: Retrofitting old analog tachometer to another engine

I have seen where others have used the stepper to only move the neddle of a tach in a relationship manner where the stepper doesn't spin the drive as a standard cable driven tach, but rather moves up and down in response to RPM. I think a Google search will uncover such an application, as I have see...
by theropod
Thu Sep 21, 2017 6:38 pm
Forum: Projects
Topic: Retrofitting old analog tachometer to another engine
Replies: 5
Views: 480

Re: Retrofitting old analog tachometer to another engine

If you could read the passing of a magnet attached to the crank pully with a Hall effect sensor it seems this would be easier. Posting here mainly to bookmark as I have a small diesel engine I would love to track its RPM too.