Skip to content


Online Resistor Color Code Tool

resistor Here is a cool java applet written to help find valid values for 5% and 10% tolerance resistors. Quick clicks to common values and a clickable table of standard values in included. The tool even shows you the resistor code to make ordering parts easier.

I created this tool as my first web based Processing.org project. The small picture shown here is just a screen shot. The active applet loads from the full article page after the jump.

I have plans for several new online tools and some ideas for improvements to this one as well. The first new feature will probably be a part number lookup on Octopart for the selected resistor value.

This is an experiment to see if the electronics and microcontroller hobby community are interested in this kind of online tool. Comment with possible improvements and suggest some new online tools and links to any other online tools of interest.

mayscript=&quottrue" scriptable=&quottrue" image=&quothttp://www.uchobby.com/java/Resistor/loading.gif" boxmessage=&quotLoading Processing software…" boxbgcolor="#FFFFFF" />

Instructions:

  • Requirements
    Java is required and a link should appear if you do not already have Java installed. Use this link to get started. With Java installed, the resistor tool should load up automatically.
  • Selecting a value
    Click on just about any colored box to change the value for the displayed resistor. Each color table can be used to select a value for the indicated color band.
  • Invalid color values
    If you select and invalid set of colors the resistor value and code fields will show Invalid. Note that the valid values table shows all the possible values for the first two bands and changes based on the selected tolerance.
  • Common Values
    Click on one of these common resistor values to quickly show the colors for that value.
  • Valid Values
    Click on one of the valid values for the first two code digits. This table will help you find the closest valid value when your calculating a resistor for some project.

 

Comments Please:

This is an experiment to see if the electronics and microcontroller hobby community are interested in this kind of online tool. Comment with possible improvements and suggest some new online tools and links to any other online tools of interest.

I expect some will suggest more or different options for the common values. I needed something to fill that space on the applet and just guessed at these values. I know 10K is common, the others are up for grabs. What values do you suggest ?

Posted in Development Tools, Parts, Workshop Tips, Workshop Tools.

14 Responses

Stay in touch with the conversation, subscribe to the RSS feed for comments on this post.

  1. This is a great tool. I’m happy to see someone using processing for something so constructive.

  2. tofu terror said

    good job! very useful!

  3. Dan said

    This is just what I’ve been looking for!

  4. FWIW I very rarely run Java applets. If you’d like to continue with Processing but potentially reach a wider audience maybe you could look at the Javascript Processing implementation: http://processingjs.org/

    –Phil.

  5. David said

    @follower How do you use Processingjs? I don’t see an IDE at the site, I must be missing something basic here. I want to play with it but there is not even a 101 style tutorial….

  6. KentD said

    I suggest you add the range of values possible based on the tolerance. So a 1K 10% would say “1000 (900-1100)”

  7. EA said

    it would be nice if you expanded it to include 1% resistors, which have 5 stripes.
    nice work!

Continuing the Discussion

  1. Resistor Tool Problems | uC Hobby linked to this post on June 9, 2009

    [...] again now if you had trouble with the Online Resistor Color Code Tool. I had some trouble getting the Java code running inside a blog post. I think that is resolved now. [...]

  2. Resistor Color Code Tool Leaves No Excuse For Mix-Ups | Robotics Blog linked to this post on June 9, 2009

    [...] [uCHobby Resistor Color Code Tool] [...]

  3. Online resistor code tool - machine quotidien linked to this post on June 22, 2009

    [...] Online Resistor Color Code Tool [...]

  4. The How-To Blog » Online resistor code tool linked to this post on June 22, 2009

    [...] Online Resistor Color Code Tool [...]

  5. Online resistor code tool | Something to share linked to this post on June 22, 2009

    [...] Online Resistor Color Code Tool [...]

  6. Online resistor code tool | Design Website linked to this post on June 22, 2009

    [...] Online Resistor Color Code Tool [...]

  7. Electronics-Lab.com Blog » Blog Archive » Online Resistor Color Code Tool linked to this post on June 29, 2009

    [...] Resistor Color Code Tool – [Link] Tags: calculator, java, resistor Filed in Basic Electronics, Software | 3 views No Comments [...]