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Re: Analog to arduino to op amp to arduino?

 by theropod ¦  Wed Jun 27, 2018 12:21 pm ¦  Forum: Arduino ¦  Topic: Analog to arduino to op amp to arduino? ¦  Replies: 9 ¦  Views: 667

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...

Re: Analog to arduino to op amp to arduino?

 by theropod ¦  Tue Jun 26, 2018 11:50 am ¦  Forum: Arduino ¦  Topic: Analog to arduino to op amp to arduino? ¦  Replies: 9 ¦  Views: 667

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.

Re: Analog to arduino to op amp to arduino?

 by theropod ¦  Tue Jun 26, 2018 11:30 am ¦  Forum: Arduino ¦  Topic: Analog to arduino to op amp to arduino? ¦  Replies: 9 ¦  Views: 667

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:

Analog to arduino to op amp to arduino?

 by theropod ¦  Mon Jun 25, 2018 7:55 pm ¦  Forum: Arduino ¦  Topic: Analog to arduino to op amp to arduino? ¦  Replies: 9 ¦  Views: 667

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...

Re: Help with addressable LED sketch

 by theropod ¦  Mon Jun 18, 2018 8:39 pm ¦  Forum: Arduino ¦  Topic: Help with addressable LED sketch ¦  Replies: 2 ¦  Views: 422

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...

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

 by theropod ¦  Thu Jun 07, 2018 10:43 am ¦  Forum: SparkFun Product Questions ¦  Topic: SparkFun Sunny Buddy doesn't charge more than 4v ¦  Replies: 9 ¦  Views: 495

Sigh, what needs to be determined is what the solar array is actually producing, and not the rating. Voltage and amperage under load.

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

 by theropod ¦  Sat May 26, 2018 6:40 am ¦  Forum: SparkFun Product Questions ¦  Topic: SparkFun Sunny Buddy doesn't charge more than 4v ¦  Replies: 9 ¦  Views: 495

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.

Re: Testing if a 230v AC circuit is closed

 by theropod ¦  Sat Feb 03, 2018 9:27 am ¦  Forum: Arduino ¦  Topic: Testing if a 230v AC circuit is closed ¦  Replies: 5 ¦  Views: 336

Wrap a wire around one “leg” of a hot line and produce induction?

Re: Cutting the trace on 5v to 3.3v

 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: 1099

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.

Re: Soldering tab-style connectors with holes

 by theropod ¦  Thu Jan 04, 2018 6:36 pm ¦  Forum: Projects ¦  Topic: Soldering tab-style connectors with holes ¦  Replies: 4 ¦  Views: 440

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.

Re: General Questions about an Arduino

 by theropod ¦  Mon Dec 18, 2017 4:22 am ¦  Forum: Arduino ¦  Topic: General Questions about an Arduino ¦  Replies: 2 ¦  Views: 411

The Arduino will retain the programming and start/run the sketch when powered up.

Re: Wind turbine disconnect

 by theropod ¦  Wed Dec 06, 2017 10:20 am ¦  Forum: Projects ¦  Topic: Wind turbine disconnect ¦  Replies: 1 ¦  Views: 219

Is this a grid tied turbine?

Re: Electrolysis Rust Removal

 by theropod ¦  Wed Nov 29, 2017 10:24 am ¦  Forum: Projects ¦  Topic: Electrolysis Rust Removal ¦  Replies: 2 ¦  Views: 343

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...

Electrolysis Rust Removal

 by theropod ¦  Tue Nov 28, 2017 6:02 pm ¦  Forum: Projects ¦  Topic: Electrolysis Rust Removal ¦  Replies: 2 ¦  Views: 343

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. ...

Re: espcomm errors after updating to macOS 10.13.1 High Sierra

 by theropod ¦  Tue Nov 14, 2017 4:00 pm ¦  Forum: Forum ¦  Topic: espcomm errors after updating to macOS 10.13.1 High Sierra ¦  Replies: 1 ¦  Views: 2493

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...

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