SparkFun Forums 

Where electronics enthusiasts find answers.

Search found 1647 matches

 Go to advanced search

Re: Controling the temperature of an oven

 by lyndon ¦  Sat Sep 29, 2018 9:04 am ¦  Forum: Projects ¦  Topic: Controling the temperature of an oven ¦  Replies: 2 ¦  Views: 191

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...

Re: "Power back on" sensor/notifier

 by lyndon ¦  Sat Sep 29, 2018 8:52 am ¦  Forum: Projects ¦  Topic: "Power back on" sensor/notifier ¦  Replies: 4 ¦  Views: 289

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 ...

Re: simple timer

 by lyndon ¦  Sat Sep 29, 2018 8:39 am ¦  Forum: Projects ¦  Topic: simple timer ¦  Replies: 15 ¦  Views: 508

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

Re: simple timer

 by lyndon ¦  Fri Sep 28, 2018 4:38 pm ¦  Forum: Projects ¦  Topic: simple timer ¦  Replies: 15 ¦  Views: 508

Here, this is probably the simplest path forward: https://www.adafruit.com/product/2935
Four switched A/C outputs you can control with an Arduino.

Re: Mini freewheel / overrunning clutch on stepper motor

 by lyndon ¦  Thu Sep 27, 2018 4:18 am ¦  Forum: Projects ¦  Topic: Mini freewheel / overrunning clutch on stepper motor ¦  Replies: 1 ¦  Views: 232

Try Stock Drive Components.

Re: simple timer

 by lyndon ¦  Wed Sep 26, 2018 4:54 am ¦  Forum: Projects ¦  Topic: simple timer ¦  Replies: 15 ¦  Views: 508

The Arduino can't turn on much more than an LED or two per output. You will need a relay/relay board (yes, normally open)for anything over 20mA or so.

Re: simple timer

 by lyndon ¦  Tue Sep 25, 2018 6:46 pm ¦  Forum: Projects ¦  Topic: simple timer ¦  Replies: 15 ¦  Views: 508

I have a post with some code here.

Re: Bluetooth

 by lyndon ¦  Wed Sep 19, 2018 4:21 am ¦  Forum: Arduino ¦  Topic: Bluetooth ¦  Replies: 8 ¦  Views: 387

Normally, Str1 would be a char array

Code: Select all
char Str1[20]
or similar. And you would reference the second element as
Code: Select all
 char c = Str1[1]
. But in your example Str1 & Str2 are int.

Re: Motor Selection Assistance / Low RPM, High Torque

 by lyndon ¦  Thu Sep 06, 2018 5:27 pm ¦  Forum: Projects ¦  Topic: Motor Selection Assistance / Low RPM, High Torque ¦  Replies: 3 ¦  Views: 243

The simplest way by far is to assemble the system you plan to build and at the point where the motor would go, attach a torque wrench and see how much torque is required to accelerate it up to the speed you want.

Re: Motor Selection Assistance / Low RPM, High Torque

 by lyndon ¦  Tue Sep 04, 2018 7:25 pm ¦  Forum: Projects ¦  Topic: Motor Selection Assistance / Low RPM, High Torque ¦  Replies: 3 ¦  Views: 243

Look at the Firgelli Automation gear motors. Lots of torque and pretty cheap.

Re: From prototype to production?

 by lyndon ¦  Thu Aug 30, 2018 7:00 pm ¦  Forum: Forum ¦  Topic: From prototype to production? ¦  Replies: 7 ¦  Views: 2229

You learn new techiques. Hand soldering doesn't work well below 1206 parts or 0.5mm lead spacing. Below that you need to use paste and reflow. It's so much faster, I never make through-hole boards anymore! It's really not hard, although I personally don't go below 0603 parts. You need to do a PC boa...

Re: From prototype to production?

 by lyndon ¦  Thu Aug 30, 2018 2:16 pm ¦  Forum: Forum ¦  Topic: From prototype to production? ¦  Replies: 7 ¦  Views: 2229

Generally speaking, prototype with the parts you expect to use in production unless there's good reason not to. I think what you are describing can be better described as a "proof of concept" than a prototype.

Re: Conductive thread and LED art project advice

 by lyndon ¦  Mon Aug 27, 2018 8:56 pm ¦  Forum: Projects ¦  Topic: Conductive thread and LED art project advice ¦  Replies: 2 ¦  Views: 209

Have you asked on Adafruit where you saw that thread? They have a bunch of people who work with textiles and electronics and can probably point you at a good starting point.

Re: University degree - help

 by lyndon ¦  Wed Aug 22, 2018 10:16 am ¦  Forum: Forum ¦  Topic: University degree - help ¦  Replies: 2 ¦  Views: 1565

Not a typo: (s)he's looking for someone to carry her/him.

Re: On - Off Switch with a momentary Button

 by lyndon ¦  Wed Aug 08, 2018 11:17 am ¦  Forum: Projects ¦  Topic: On - Off Switch with a momentary Button ¦  Replies: 3 ¦  Views: 213

A Teensy is awfully big. An Adafruit Trinket is smaller. I was a bit harsh on the pricing statement: you can pick up an easy-to-program AVR like a Tiny13 and program it with a SOIC clip if you don't want to take up the space for a programming header and the cost in single units is only about $0.99 (...

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 110