We have all been there. A large bag of resistors are mixed together. Maybe you bought them cheaply. Maybe your neat and orderly drawer has spilled. Of course, you can read the color codes one by one locally. Or use a meter. But either way, this is a tedious job. [Ishann’s solution is to build a
, Instead of relying on machine vision as you usually do in these projects. This means that it can be modified to match the exact circuit (for example, all resistors marked as 1K are sorted out of a resistor whose nominal value differs by more than 0.5%).
There is a funnel that allows one resistance at a time to enter the test area where the resistance is measured. The bottom plate rotates according to the measured value. In the current implementation, the resistors are either on the left or on the right. Not difficult to make
For different resistance values. It seems that you have to provide one resistance to the machine at a time, and considering the degree of looseness of the axial components, automating it seems a trick. Nevertheless, this is an interesting project and you may need to make all the parts.
Arduino powers things. LCD screen and display control operation. If you want to practice some manipulator handling materials, this is a good use of servo and gravity, and it can indeed achieve practical purposes.
We have seen many changes, including those
. If you want to know
, We walked over to understand the situation earlier this year.
Just throw them in the trash can
You may be confused when you remember the exact value of the discarded components when you remember a time-critical project.
To be sure, they will eventually abandon the current color codes that only apply to the strange EE certification and use the printed numbers like all other components. At least many people now use blue instead of beige as a background.
-Color blind people
I ran a test when I was at work and asked 4 different people to read the color code (only the color) of the resistor, and then got 4 different answers. +1 is used to print the value.
What exactly are you doing?
Assuming that at least one person gets it right, does this mean that 75% of people are color blind? Although statistically speaking, the subject of "test group" is technically less technically required than the component itself. Or maybe you are biased towards "testing" by enticing them to use the hardest to read resistor you can find.
The value of printing is not perfect, and the ribbon system has been working well in the electronics industry for decades. If you need numbers, switch to large SMD components. Reading ribbons is a skill (assuming you are not color-blind), and every skill requires practice to produce reliable results. Keep practicing...
I work for an electronics manufacturer.
Three of the four colleagues are skilled technicians.
The problem is that the colors used by the resistor manufacturer (Vishay or Yageo I think) are difficult to distinguish. In this case, red and brown...
Yes, I really don't understand why they can't have both at the same time. There is also a 3-character code with a ribbon in the middle. Not why this is not a problem
Asking to kill the color code is like asking the measurement system to be killed. This is a globally recognized marking system. As for blue objects, they have been around for many years, but this is especially true for high-precision or military resistors. As you said, they have become more common for standard values in the past few years.
As for your comment on color blindness, I fully understand your helplessness. Contrary to the auxiliary tools used daily, the color coding of resistors can be a major problem. I have worked with color-blind people who often use TH resistors, but only one person came up with a solution. She uses some kind of visual system connected to the desktop to set it up. The visual system displays the enlarged parts on the screen and determines the value based on color recognition. The resistor must be manually positioned in the center of the bracket, but it works well. I don't know what the system is, but it was about ten years ago.
Nowadays, I think you can use RPi to perform similar operations very easily.
They have been evolving and changing more than 20 years ago, but you are still using through-hole packages. SMD resistors have printed values (until they become too small).
I don't have a problem with smd parts, and I use them at work every day. However, many of our customers include smd and slotted parts in their designs.
I don't know the exact reason for them.
You don't have to be color blind. The digital code on the SMD part is very pleasant.
A million times. I don't even have color blindness, and I have difficulty seeing the colors on them most of the time. In addition, there is still enough time that I can never remember how to read the code, so I have to look for it every time. A mess.
You may not think you are colorblind, but you may actually be. I only found out when the optometrist asked me to perform a "paint can" test. In the test, you have about twenty round blocks, each with a small color on the top. You should align them so that the closest colors are together to form a circle. I finally achieved an eight-figure result. Basically, although I have no problem with high-quality red and green, it is difficult for me to distinguish the shades of brown, especially in the small unconnected pieces, and the background color is not good, which is what modern beige resistors can achieve.
I don't have much problem with the classic dark brown cylindrical resistors, usually these resistors also have wider stripes. Yesterday I was looking at some 1-watt resistors salvaged from a power supply or something. The thin lines between these stripes are 1 mm apart, and the blue background is blurred. I use DVM to check their values.
I feel your pain, oh so much. I have thousands of these through-hole resistors and can save them in case of a rainy day. The purpose is to recruit my daughter or anyone nearby who is not color-blind for identification. Admittedly, I haven't gone to the trash can, but I know that day will come. Knock on the wood, after I was stored for a long time, hopefully it has been several years now.
I found that sorting resistors is a kind of "zen" :) But again, I can identify the visible value of the E12 series. I only measure E192 or 1% resistance. I usually sort them by the multiplier first, and then put them in the tray according to the value.
When making PCBs, SMD resistors are usually used unless it is a special value or type (for example, in low-noise applications) or requires higher current.
Well, this is a good idea, but for devices with color markings, it is better to use color codes.
the reason.
1Color codes are not just resistance values, they are also values of the e-series being used
2 The color code can be used to check whether the resistance
A) Defects (wrong IE value or defective resistor)
B) Available (after testing the value it has)
Think this is the best way to conduct empirical testing with the information provided.
It is best to use both at the same time.
Marking is a serious problem. First of all, the color may be designed to be a specific color. It is unlikely that they will choose a random color for marking (and it is just ordinary ignorance). If they use a printed color gamut and a calibrated light source to ensure color matching, it will make sense. At least for me. Some people throw wise things because of the "this is the way we do it" attitude. Okay, okay, you hit the wall with your head, repeating history, I guess. Is my response: D
The background color of the resistor may be part of the problem, but the eyes must distinguish these colors. It is easiest to distinguish colors with a white background or a light background. Blue is a bit harsh on the eyes,
Except for a student project presentation or access to views, I really have no other use.
I mean, if you still have to deal with the resistors one by one, then you can sort them yourself-faster and easier. If for some reason you cannot read the color code, or you need to pass the test urgently, please install the same measurement system and light up an indicator light on the corresponding output classification box. There is no need to lift the resistor up and place it in the chute, without waiting for the measurement cycle and servo movement.
I am color-blind and have never had a problem, using the correct RETMA color on my brown body. But this new rubbish...
Red, orange, brown, and even yellow are aging people who are tan and so much better. Could it be dirty white, gray or half of blue or purple? Although green and black are usually green and black.
Sometimes, it’s not that it’s easy to fade or peel off the numbers on ceramic covers of the same age..., the last number is the curved top and stains, even 2, 3 or 8?
It seems that a lifetime ago, I did something for the company I worked for. This is for the girl who fills the line by hand. You take a resistor from a trash can and it will tell you whether the other resistor is "same". I finished building another amplifier, so you can increase the gain of the differential amplifier and quickly reduce the matched amplifier pair to a small percentage.
Well, this is Ishaan who created this project.
But how to post it here without my approval.
Ok i get it
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