![]() For example, if you send a fly forward command followed by a rotate command, the rotate command will fall on deaf ears. The blocks simply issue commands, but there is no feedback. It just runs a simple pattern and adds some sound effects (from the PC, not the drone). I put together a quick little Scratch program. The blocks will let you set any value you want, though. From reading the API documentation, I learned the move units are in centimeters and some have minimums as well as maximums. There is API documentation (PDF) available if you’d like to look under the hood. Once this is complete you’ll wind up with some blocks in the “More Blocks” category shown here. Tello acts as a WiFi access point and control is established when you connect to it with your computer and run the nodejs server from the command prompt. You are then greeted with the “Import Experimental HTTP Extension,” option. The Ryze files are installed via a hidden menu command accessed by holding shift while clicking “File”. You also need to install nodejs and a few files from Ryze Tech (PDF). I had trouble getting this to work on a Linux system so I finally gave up and installed it on a Windows laptop. You need to use the offline version of Scratch which requires Adobe Air. Information about the programming environment is rather sparse, so I dug in to find out how it all worked.Īs with a lot of hardware programming tasks, setting up the toolchain is the most frustrating part. However, the API is usable from other languages with some work. In particular, they use Scratch - the language built at MIT for young students. What piqued my interest was that you can program the thing using a PC. In addition, the optical sensor works indoors unlike GPS.īut if that was all there was to it, it probably wouldn’t warrant a Hackaday post. ![]() But the Tello optical sensor does a great job of keeping the craft stable as long as there is enough light for it to see. Normally I don’t suggest getting a drone with no GPS since the price on those has come down. I’d go as far as saying it is the best $100 drone I’ve ever seen. What’s more exciting for someone learning to program than using it to fly a quadcopter?įor $100, the Tello drone is a great little flyer. The Tello is a small drone from a company you’ve never heard of (Ryze Tech), but it has DJI flight technology onboard and you can program it via an API. But I recently bought a drone for $100 that is both technically interesting and has great potential for motivating kids to learn about programming. Some cost the better part of a thousand bucks. There are probably another half dozen in the garage. Sitting at my desk I can count no fewer than ten in various states of flight readiness.
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