Search found 97 matches

by theropod
Wed Jun 27, 2018 12:21 pm
Forum: Arduino
Topic: Analog to arduino to op amp to arduino?
Replies: 9
Views: 235

Re: Analog to arduino to op amp to arduino?

If your question is merely hypothetical, then say so. It will certainly work, but it adds additional components & complexity for no benefit. All, This will be my last post here, and the admin can delete it so as to protect the sensitive, but I will have my say before this eventuality. I have been w...
by theropod
Tue Jun 26, 2018 11:50 am
Forum: Arduino
Topic: Analog to arduino to op amp to arduino?
Replies: 9
Views: 235

Re: Analog to arduino to op amp to arduino?

lyndon wrote:
Tue Jun 26, 2018 8:36 am
Yes, you can do that.
But what I think you really want to do is read the joystick (analog) input and then output a variable pulse rate stream to the EasyDriver depending on the value you read. No need for any opamps in the middle.
Never mind. I was only presenting a hypothetical.
by theropod
Tue Jun 26, 2018 11:30 am
Forum: Arduino
Topic: Analog to arduino to op amp to arduino?
Replies: 9
Views: 235

Re: Analog to arduino to op amp to arduino?

jremington wrote:
Tue Jun 26, 2018 8:29 am
Please explain, as clearly as possible, what you want to do and what hardware you will be using.
Then you can expect some sensible advice.
:lol:

Seriously? Did you even read my post? Unbelievable.

My expectations? Lowered.

:lol:
by theropod
Mon Jun 25, 2018 7:55 pm
Forum: Arduino
Topic: Analog to arduino to op amp to arduino?
Replies: 9
Views: 235

Analog to arduino to op amp to arduino?

Is it possible to read the analog input, say from a joystick, output a variable voltage signal to an multiple stage op amp and then send these signals back to the arduino for a different digital inputs? Say the analog input is intended to eventually drive an Easy Driver, and one wants to have 3 dist...
by theropod
Mon Jun 18, 2018 8:39 pm
Forum: Arduino
Topic: Help with addressable LED sketch
Replies: 2
Views: 163

Re: Help with addressable LED sketch

If I understand you correctly a pair of CD4017 decade counters would do this from a stream of pulses generated by an Arduino very similar to driving a bipolar stepper motor via an Easy Driver. This could also be done with a pair of LM3914 bar/dot drivers and a PWM ramp up of voltage in perhaps a cap...
by theropod
Thu Jun 07, 2018 10:43 am
Forum: SparkFun Product Questions
Topic: SparkFun Sunny Buddy doesn't charge more than 4v
Replies: 7
Views: 140

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

Sigh, what needs to be determined is what the solar array is actually producing, and not the rating. Voltage and amperage under load.
by theropod
Sat May 26, 2018 6:40 am
Forum: SparkFun Product Questions
Topic: SparkFun Sunny Buddy doesn't charge more than 4v
Replies: 7
Views: 140

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: 240

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: 757

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: 314

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: 275

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: 177

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: 255

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: 255

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: 1879

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...