Cheap eBay brushless gimbals?

Category : Electronics, RC

It’s really exciting how much the prices have dropped on brushless gimbal lately, and there are swarming with 70$ gimbals for gopro on ebay. I’ve seen some videos around youtube about their performance and it seems pretty good!

So I got around and ordered me one for testing, turns out it worked fine out of the box:

Great! I sold that gimbal to a friend and ordred me a new one, why not? They are working out of the box. Only mount your gopro camera onto it and power it on! So I thought.

My second gimbal arrived in a different box, and after closer inspection it has a different layout on the PCB, it also has a micro usb instead of a mini usb. So what, I mounted my gopro and powered it up. Heres my results:

Listen closely, can you hear that cracking noise?

After several rounds of testing, I still get the same results. So I contacted my eBay seller and complained about it. Long story short, he is now sending me a new controller board. He also provided me with some manuals written in chinglish. They might come in handy, especially if you also are having trouble with one of these gimbals:

Dropbox link for manuals.

Bad quality shield bought on eBay

Category : Arduino, Electronics

I was looking for some cheap shields for my Arduino board, and stumbled across a very inexpensive proto shield. A well known seller with good reputation had it laying around for only 7,65 $, so it couldn’t be that bad.

Well, after a couple of weeks it arrived in the mail. And here are a few things I noticed:


Looks like it’s rusted and kind of old?


Not even close to nice solderings…


Some plastic is melted off? 😛

Well, its not worth that much and it actually works, but for how long?

Whats most annoying is how the seller can say that its Quality and New!

 

Ultrasonic HC-SR04 Sensor

Category : Arduino, Electronics

I’ve stumbled by this neat little sonar sensor on eBay a few days ago, I’ve had some bad experiences with other similiar ultrasonic sensors so I was kind of skeptic to this one. But for the low price I couldn’t resist. Anyhow, it turned out to be a great sensor. It’s accurate down to 1 cm, which is perfect and in most cases more than enough. You get it for around 5$ on eBay.

 

Only problem I ran into when using it with arduino was the library, got some nasty compiling errors. So I changed a few lines in the library and made it work with Arduino 1.0 and older arduino IDEs.

Download HC-SR04 Library for Arduino 1.0

Also wrote a little example for using it with a serial display: