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Real fun project for school. What lucky students to have someone like you do this. You could get a HAM Radio license and shout out real time data including landing site. Besides students would find terrific scientific and every day use of the license if they were encouraged to get their own.
Neat deal Spaceshark. I've been a ham 62 years starting at 14 years old and even made my career in electronics due to Ham Radio, getting patents and all that stuff, What is so interesting is the science of shortwave propagation, talking to other Hams around the world, using Ham satellites, building gear like you did plus hour upon hour of fun experiences and experiments. How about putting a small VHF transmitter on a balloon and finding how far it can be heard? The formula for line of sight on a curved earth could be checked out and I bet distances (DX) will be greater due to the bending of radio waves due to the atmosphere. In addition you can send pictures as the balloon is in the air. Again, very nice instructable, I plan to use some of your ideas. 73, Jim K5BTV.
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Neat idea to use a bucket of water and a pump instead of using water mains. This way any problem will be limited to water in the bucket. A small amount of Miracle grow ought to be a great fertilizer too. I'm gonna try it next spring
Good app and will work well with DC motors. I've used this circuit for several years for another application . The graphic of PWM is a little misleading though because it does not apply to this circuit design. In this circuit, the modulation is a fixed width of one polarity as set by the potentiometer not variable during the "firing" as shown the sine wave example.
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