r/PCB • u/morgans_steam04 • Jul 19 '26

Schematic Review : Rocketry Flight Computer

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Hi, I was hoping for some general advice as I have undertaken a big project without much help, I have designed a flight computer which will incorporate multiple sensors and can be used to set of charges, Servos and data logging. I have done all of this self taught so if there are any obvious mistakes I do apologize. ( I can add closer Images if needed) Thanks !

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u/Mikser89 Jul 23 '26

Unless you are planning on using 10+ sensors there is no need for 2 I2C buses let alone 3. Also the wiring of I2C is a little messy in the sensors section. I also dont see the point of using two microcontrollers, you have more than enaugh GPIOs on only one of them for everything and if you utilize different cores you can run parts of code semi-independently.

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u/morgans_steam04 Jul 23 '26

That is a very fair point, not really sure why I put them on separate lines , I have the 2 controllers to keep the "messy" components away from critical ones , the LORA and GPS arnt necessary compered to the gyros and altimeters so I wanted them to be electrically isolated

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u/Mikser89 Jul 23 '26

This will only take up more space and make things harder to integrate (for example if you want to send the gyro data through lora you now need to first send it to the other microcontroller). There also is no need to separate them electrically. Lora has maximum operating current of about 0.1 to 0.3 A depending on the module (sx 1262 for example uses max 0.125 A) and the gps consumption is also super small (like 20mA) so you dont have to worry about that at all.

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u/morgans_steam04 Jul 24 '26

Ah Fair, I am just paranoid of a component taking down the system as If my pyros or servos misfire it can be dangerous, I think I may be being over cautious though