electro static discharge (esd) safe seat cover
It is a big problem for electronic products.
Static electricity can accumulate on the surface (
You, your table, your chair, your floor and so on)
When it is discharged, it will make a bang.
When you get an electric shock after shuffling on the carpet, touching the door handle or another person, the electric shock is the result of an electrostatic discharge between you and the object.
While it\'s just annoying and surprising for you, it\'s really bad for your e-project.
If your workspace is not ESD safe, then you will take a risk when using ESD sensitive components.
The most insidious aspect of ESD damage is that it is cumulative.
Your components will continue to work, but they will not work either, and any failures can be inconsistent and mysterious.
You can be like (
Home page of electrostatic discharge Association).
The good news is that it\'s relatively cheap and simple to protect yourself from ESD damage.
The key is to make sure all parts of your Workbench (
At the same potential.
You do this by working on Static dissipation pads (
Wear ESD wristbands (
Even if you\'re wearing a wristband, it\'s important that you don\'t do anything to charge your body.
Placing your feet on a carpet or sitting on a synthetic fiber chair can create significant static electricity on the body.
My electronic Workbench is right behind my computer, so it is convenient to rotate from the computer to the workbench on my office chair.
The problem for me is that my office chair is decorated with polyester and quickly generates static electricity on my body.
So I never use an office chair while working on an electronic workbench, switching from a computer to a project can cause neck pain.
Since I often program Arduino or other microprocessor, I have to switch back and forth frequently.
The solution is to install a static wear-out surface for my chair.
My search for ESD safety chair covers brings many very expensive professional options that go far beyond what I want to spend, so I turn my attention to making one from scratch.
I know the surface needs to be conductive, and I first looked at conductive fabrics like this: The problem with this material is once again the price tag.
I know I can do a better pricewise.
The solution was found to be a space blanket.
This material is a polyester sheet with a thin layer of aluminum vapor deposited on it.
The aluminum layer is conductive and the things are super cheap;
This is a perfect solution.
What you need: 1)Space Blanket.
You can buy this from a camping shop or a good hardware shop.
You can also buy cheap online like Amazon.
Is expected to pay about $3 (US)for one. 2)18-
Specification twisted copper wire, preferably green insulation (
Green is always the ground in America).
A fine of 6 or 8 feet. 3)One 500 kilo-ohm resistor.
You can use 1 MB easilyohm or 2 mega-ohm resistor.
The purpose of the resistor is to ensure that the current does not flow into your Landcover from the rest of the project.
This is not good at all. 4)
Heat shrink tubbing5)
Two crocodile clips6)Packing tape (optional)
Seat: expand your shiny new space blanket and check it out.
One side will shine more brightly than the other;
This is probably the conductive side.
Take out your multimeter and test the conductivity.
One side should be rightconductive (
Only one side of polyester)
The other is very conductive (
Aluminum plated side).
You will want the aluminum plated side to be placed up on the chair so that it will be in contact with your body.
Use sharp scissors to cut a space blanket a little wider than your chair, long enough to cover the seat and back with something extra, in order to fold on the top of the back of the chair and the front of the seat.
Space blanket (aluminum up)
Put it in your chair and arrange it so that it doesn\'t stretch when you sit.
The extra part at the top of the back should be folded over the top and taped so that the chair can sit in the pocket.
Do the same with the space blanket at the bottom of the seat.
You should end up with two pockets: one at each end of the space blanket strip.
If your seat cover is not grounded to the ground system on your workbench, then it is of no use.
All of your ESD safety devices need to have the same potential.
You have to build a cable that plugs the Landcover into your ground network. 1)Take a small (About 5 inch)
The length of the flexible Green Line and weld the crocodile clip to one end.
Heat shrinkage on the connection. 2)
Weld a terminal of resistance at the other end of the small length wire. 3)
Cut a longer line (6 feet or so)
And Weld one end of it to the other end of the resistor. 4)
Use the heat shrinkage around the resistance to relieve the stress of the solder joint. 5)
Weld the second crocodile clip at the other end of the wire.
Be sure to turn on your heat shrink before you connect the crocodile clip.
If you forget this step, you will be disappointed with yourself.
If your ground system uses the Banana plug, then you can use the Banana plug here. 6)
Test the cable using ohrazer built into multiple metersmeter.
The cable should have the resistance you add to the cable.
Now that your interior decoration work has been done and your conductors have been tested and worked, the only thing left to do is plug in!
Clip one end of the wire onto the seat cover and the other end onto the terminals of the ESD protection grounding system.
If you measure the resistance of the grounding device to any point on the Landcover, you should get something slightly higher than the cable resistance.
At this point, you may be worried that the cable that is loose from the seat cover may eventually tear the space blanket material.
To avoid this, tie the cable to the blanket to provide strain relief.
Since your seat is safe, you can rotate back and forth from your computer to the Workbench you want without worrying about catastrophic damage to your project.
Your Shiny Space Age seat is sure to impress your friends.