2-4S 30A RC Brushless ESC Simonk Firmware Electric Speed Controller with 5V 3A BEC with 3.5mm Female Banana Bullet for 2 to 4s Lipo Battery, DIY Multicopter Quadcopter (30A, 4 pcs)

So when I first tried to use these they wouldn't work at all. My main problem turned out to be not having a common ground because I had different power sources for my Arduino controller and the ESC's/Motors. They all work great and don't seem to have any heating issues yet. Used with 935kv motors and 3S battery, working well so far FOR CALLIBRATING: 1. Have motor/reciever sending data 2. Throttle up to full 3. Power the ESC/Motor 3. You should hear 3 D's (means getting power) followed by 1 D (means getting HIGH signal) 4. Lower throttle to the minimum 5. You should hear 2 D's -- after that you should be good to throttle up

I initially left a bad review, because after connecting this to an Arduino and trying to activate a motor with a basic servo sketch, it did nothing other than make the ESC beep. Then I did some more research and learned these ESCs have a startup routine needed to "arm" them, AND that I needed to power cycle the ESC after each Arduino update. After doing both of those, then my servo sketch worked.

i BOUGHT THE FOUR SET AND NOW ONLY HAVE ONE THAT WORKS THE SPEED CONTROL GOS OUT AND THE PLANE COMES DOWN TWO THAT ARE WASTED AND ONE GLIDED IN NOT WORTH THE MONEY.

Good power source.

I received my four ESC and they might or might not work. I ordered them because I need a brake setting for folding props. I'm perfectly fine with programming them with my transmitter using a series of beeps and throttle movements. I'm also perfectly fine programming them with a programming card. But, there are no instructions included with these ESC. "Ok", I think, "I'll just go to their website". Nope, no instructions there either. So, I think, "Well, this is just Simon K firmware, I should be able to do a quick internet search." Nope, as you can guess, the instructions are based on the version of the firmware you're using. Now, I could go out to the shop and fiddle around with these ESCs and ultimately hack my way through the process. But, it's RIDICULOUS that I have to. These are being shipped back ASAP and I'm going to order some better supported ESCs. And by the way, if you're answering questions about Amazon products - such as whether or not they come with instructions or how to program them, please stop answering incorrectly!

I need to change power-on defaults. Which config file should I use when loading SimonK? Thanks.

These are bigger than I expected but they will work fine

This works well on a motor like a 2216 1400kv that's only pulling 18a. If you're using a High KV motor. Steer clear of these. I've cooked 2 already and wasn't even pushing it hard.

They seem to work ok, however, one unit was dead on arrival.