Search found 1629 matches

by lyndon
Fri Nov 23, 2018 4:27 pm
Forum: SparkFun Product Questions
Topic: Redboard & 3.3volt snsors
Replies: 6
Views: 180

Re: Redboard & 3.3volt snsors

Have you actually tried it?
by lyndon
Thu Nov 22, 2018 11:43 am
Forum: Projects
Topic: Beam-break sensor w/ reflector panel
Replies: 6
Views: 157

Re: Beam-break sensor w/ reflector panel

Search Amazon and you should find quite a few. I repackaged and resold one, but I don't have my records on exactly which one I used right now.
15 m is a pretty long distance though.
by lyndon
Tue Nov 20, 2018 6:01 am
Forum: Arduino
Topic: Motor control
Replies: 6
Views: 146

Re: Motor control

Find out how much current your motor needs and purchase a power supply! Here are 2,500 examples: https://www.digikey.com/products/en/power-supplies-external-internal-off-board/ac-dc-desktop-wall-adapters/130?k=power+supply&k=&pkeyword=power+supply&pv1989=0&sf=0&FV=ffe00082&quantity=&ColumnSort=0&pag...
by lyndon
Thu Nov 15, 2018 7:30 pm
Forum: Projects
Topic: Sound Level Warning Device: Suggested shopping list
Replies: 10
Views: 271

Re: Sound Level Warning Device: Suggested shopping list

You said you want it to be accurate. How are you going to calibrate it?
by lyndon
Wed Nov 14, 2018 11:56 am
Forum: SparkFun Product Questions
Topic: programming lots of flash chips like SF does for the AS726X boards
Replies: 6
Views: 160

Re: programming lots of flash chips like SF does for the AS726X boards

A common way is to order them preprogrammed with your code. Many parts vendors offer this service.
by lyndon
Wed Nov 14, 2018 11:55 am
Forum: SparkFun Product Questions
Topic: Wow... is Sparkfun overcharging like crazy or am I wrong here?
Replies: 2
Views: 164

Re: Wow... is Sparkfun overcharging like crazy or am I wrong here?

What's your definition of "overcharging?" How did you determine what the appropriate price was?
by lyndon
Mon Nov 05, 2018 6:03 am
Forum: PCB Design Questions
Topic: Amplifier LM358—classical circuits
Replies: 1
Views: 177

Re: Amplifier LM358—classical circuits

So I take it, between this and your other post, that your real intent is just to spam the forum to get traffic to that site?
by lyndon
Wed Oct 31, 2018 4:26 am
Forum: PCB Design Questions
Topic: Amplifier LM358—classical circuits
Replies: 1
Views: 177

Re: Amplifier LM358—classical circuits

Those specific drawings originate from the National Semiconductor Linear Applications Handbook , but many the circuits themselves may have been published earlier in Walter Jung's IC Op-Amp Cookbook . National Semiconductor is now owned by Texas Instruments. I'm a pretty good mood today :-) If you pr...
by lyndon
Fri Oct 12, 2018 6:39 pm
Forum: Projects
Topic: Arduino Programming for Salami Production
Replies: 3
Views: 645

Re: Arduino Programming for Salami Production

tglaser92 wrote:
Fri Oct 12, 2018 4:00 pm
in Lehman's terms a relay works like this...
Layman's.
by lyndon
Mon Oct 08, 2018 4:24 am
Forum: SparkFun Product Questions
Topic: LED's For Lithophanes
Replies: 3
Views: 114

Re: LED's For Lithophanes

Well, he/she didn't say how many batteries could be used, so...
by lyndon
Sat Oct 06, 2018 11:05 am
Forum: SparkFun Product Questions
Topic: LED's For Lithophanes
Replies: 3
Views: 114

Re: LED's For Lithophanes

I took a printmaking class several years ago, including intaglio, but I had never heard of a lithophane, before now! That said, I don't think any particular LED will matter, the issue you're going to run into is diffusing the light across the entire scene. Modern LEDs are very efficient but you're n...
by lyndon
Sat Sep 29, 2018 9:04 am
Forum: Projects
Topic: Controling the temperature of an oven
Replies: 2
Views: 162

Re: Controling the temperature of an oven

Assuming you already have code for basic temperature control, what you need to do is maintain a timer, and every 60 seconds, increase the setpoint by 3 degrees. e.g., int time = 0; int setpoint = 20; // Update loop every 0.1 seconds const int TIME_INCREMENT = 100; const int TIME_LIMIT = 20 * 60 * 10...
by lyndon
Sat Sep 29, 2018 8:52 am
Forum: Projects
Topic: "Power back on" sensor/notifier
Replies: 4
Views: 225

Re: "Power back on" sensor/notifier

If your transfer switch is turned to the house, how are you going to sense current on the utility side? You can get a voltage reading, but there should be no current flow unless you wire something on that side of the line. Who is your power company? You may be able to find a public API to their web ...
by lyndon
Sat Sep 29, 2018 8:39 am
Forum: Projects
Topic: simple timer
Replies: 15
Views: 430

Re: simple timer

Ah. That seems like a very low current requirement.
But anyway, this should work fine.