The following is my personal advice, it probably doesn’t apply to all contractors, but it’s certainly applied to me. When you start contracting, your most pressing question is probably “how do I find clients” so here’s what little I’ve learned so far…
For some, contracting is seen as a potential escape route from the hum-drum of a dull, often political office environment. But contracting isn’t always the answer. Pay, while often better, is inconsistent. I’ve had clients pay two months late (and think it’s normal), pay the wrong amount (due to misunderstanding currency conversion) and just plain forget to sign off an invoice. Chasing down these invoicing issues will all be your job. Clients will say “we’ll definitely hire you” and then a contract will never happen.
Continue reading “Life On Contract: How To Find Clients As An Engineering Contractor”
After a tough summer of botnet attacks by Internet-of-Things things came to a head last week and took down many popular websites for folks in the eastern US, more attention has finally been paid to what to do about this mess. We’ve wracked our brains, and the best we can come up with is that it’s the manufacturers’ responsibility to secure their devices.
Chinese DVR manufacturer Xiongmai, predictably, thinks that the end-user is to blame, but is also consenting to a recall of up to
300 million 4.3 million of their pre-2015 vintage cameras — the ones with hard-coded factory default passwords. (You can cut/paste the text into a translator and have a few laughs, or just take our word for it. The company’s name gets mis-translated frequently throughout as “male” or “masculine”, if that helps.)
Xiongmai’s claim is that their devices were never meant to be exposed to the real Internet, but rather were designed to be used exclusively behind firewalls. That’s apparently the reason for the firmware-coded administrator passwords. (Sigh!) Anyone actually making their Internet of Things thing reachable from the broader network is, according to Xiongmai, being irresponsible. They then go on to accuse a tech website of slander, and produce a friendly ruling from a local court supporting this claim.
Whatever. We understand that Xiongmai has to protect its business, and doesn’t want to admit liability. And in the end, they’re doing the right thing by recalling their devices with hard-coded passwords, so we’ll cut them some slack. Is the threat of massive economic damage from a recall of insecure hardware going to be the driver for manufacturers to be more security conscious? (We kinda hope so.)
Meanwhile, if you can’t get enough botnets, here is a trio of recent articles (one, two, and three) that are all relevant to this device recall.
It’s been said that with enough soap, one could blow up just about anything. A more modern interpretation of this thought is that with enough knowledge of chemistry, anything is possible. To that end, [Peter] has certainly been doing a good job of putting his knowledge to good use. He recently worked out a relatively inexpensive and easy way to etch metals using some chemistry skill and a little bit of electricity.
After preparing a set of stencils and cleaning the metal work surface, [Peter] sets his work piece in a salt solution. A metal bar is inserted in the other end of the bath, and both it and the work piece are connected to electrodes. The flow of electricity removes some metal from the exposed work surfaces, producing whatever patterns [Peter] wants.
One interesting thing that [Peter] found is that the voltage must stay under 6 volts. This is probably part of the reason it’s relatively easy to etch with even a wall wort. Above that, the iron work piece produces a different ion which can clog the work surface and create undesirable effects. Additionally, since his first experiments with this process he has upgraded the salt bath with magnetic stirrers. He also gets the best results in a very cold environment.
There are many other uses for etching metals, too. Creating your own printed circuit boards comes to mind, but there are plenty of other uses as well. What will you do with this technique?