Looking for help to review the schematic for my Rocket flight computer PCB

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alexandre78

Joined May 12, 2024
1
Hello everyone!
The board that I am creating is a flight computer for a model rocket that has a barometric pressure sensor (MS5611) and an Inertial Measurement Unit (BMI088) to measure orientation, acceleration, and altitude. Additionally, the computer is designed to control 3 servos ( one spare and two dedicated to TVC control), as well as 2 separate "Pyro Channels", since i'll use a nichrome wire I need to be able to let a high current through. Lastly, the board will have a DC motor driver in order to control a reaction wheel . The board will be powered by a 3S LiPo Battery and connected through XT60. The voltage will be regulated down to 5V and every components needing 3V will be powered by the teensy 4.1 pin. I also added a buzzer and a tri-color LED to add some visual flair. I am still in high school, so I have no formal EE education at all, and this is the first time I have expanded beyond the breakout boards, so I am fully expecting to see mistakes, and if you see any please point them out to me. Feel free to also give advices regarding the final PCB layout and how wide my traces should be ( especially for the battery ground). Schematic_sprout_2024-05-12.png
 

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BobaMosfet

Joined Jul 1, 2009
2,211
Hi. I know it's just the Bee's Knees to make something like this. I've wanted to for years. Here's the problem. Model Rocketry Falls under FCC Regulation as 'Experimental'. Because of this, IT IS NOT ALLOWED TO HAVE GUIDANCE SYSTEMS. If you do so, you violate both FCC and Military regulations which states that any kind of rock WITH a Guidance System, is in fact, considered a MISSILE. And they don't want citizen's owning their own missles.

Sorry to halt your dream. I'm sure you've seen people on YouTube do it- Because they (like most Americans) are ignorant of the Law. FCC penalty could be HARSH if they get caught, plus the confiscation/descruction of all they've made.
 

sghioto

Joined Dec 31, 2017
8,633
If the TVC is for stability it's allowed under TRA and NRA and amateur.
Can't use for directing a rocket from point A to point B.
EDIT: that post is from last May.
 
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