Smallest Model Rocket Flight Computer

Smallest Model Rocket Flight Computer

https://hackaday.io/project/169916-smallest-model-rocket-flight-computer

The goal of this design was pushing my limit to shrink all of the electronics to the smallest PCB possible.
After so many iterations I came up with this design. Dimensions are 22mmx28mm

Main MCU PCB has 4 layers. It has STM32F411CEU6 as MCU, BMP280 as the barometer, MPU6050 as IMU, Winbond SPI flash, 2 times 2 channel MOSFET, RGB led and buzzer.

And there is a top PCB, that is connected to the MCU PCB with 1.27mm header pins.

Top PCB has 2 layers. There is 2 component. L80 GPS module and HM-TRLR-S Lora module.

All the passive components are 0402. I'm planning to solder them using hot plate made out of old iron.
Gerber files are sent to the OSH PARK. Waiting for them to experiment.

Nice project altimeter, but the AltusMetrum MicroPeak altimeter altusmetrum.org/MicroPeak is only 18mm x 14.5mm and only 5mm thick including the battery holder.

So its going occupy roughly the volume as a Eggtimer Quantum, by being shorter in length and width but thicker in depth. Details beyond width and length are lacking. But wouldn't using header pins and a daughter board with the GPS on it make it unnecessarily thick?

The designer is in Turkey.

https://hackaday.io/emrelio

It is possible that he is not familiar with the commercial offerings available to fliers outside of Turkey.

Johnly said:

Nice project altimeter, but the AltusMetrum MicroPeak altimeter altusmetrum.org/MicroPeak is only 18mm x 14.5mm and only 5mm thick including the battery holder.

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The Micropeak is data logging only, if I understand the parts list, this one is dual deploy and data logging....I think....

https://rocket.payload.free.fr/index.php?option=com_content&view=article&id=26&Itemid=15&lang=en

51mm x 18mm and approximatly 7g

If someone knows of a true DD that fits in a smaller tube, I want to see it!

dhbarr said:

https://rocket.payload.free.fr/index.php?option=com_content&view=article&id=26&Itemid=15&lang=en

51mm x 18mm and approximatly 7g

If someone knows of a true DD that fits in a smaller tube, I want to see it!

Click to expand...

The only time I ever hear of Bear Altimeters is when a subject like " smallest" altimeter comes up, how many TRFers are actually flying them? I have nothing against Bear (and no experience with them), but rarely do I hear people on TRF talking about them.

rharshberger said:

The only time I ever hear of Bear Altimeters is when a subject like " smallest" altimeter comes up, how many TRFers are actually flying them? I have nothing against Bear (and no experience with them), but rarely do I hear people on TRF talking about them.

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I have three flights on 2 altimeters.

cwbullet said:

I have three flights on 2 altimeters.

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Thanks Chuck, has anyone done any reviews of them here on TRF? A search doesn't seem to bring much up about them, some reviews might go a long ways towards increasing exposure for the seller.

Give me a couple weeks and I will do one. He is very good about shipping but it is from France. It is a plug and play altimeter but no data download.

Hi! I'm the publisher of this HackADay log. This design might seem thick for you but none of the suggested altimeters have built-in Lora/radio telemetry or GPS. And this data's are important for rocket computations in Turkey.

And I'm not trusting to header pins for keeping intact. There are 4 screws for holding the boards.

There might be better ones especially AltusMetrum and ExRockets ones. These boards are amazing. But I wanted to design my own and learn by doing this.

Thank you.

emre özkan said:

This design might seem thick for you but none of the suggested altimeters have built-in Lora/radio telemetry or GPS. And this data's are important for rocket computations in Turkey.

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I’m just curious, but do you mind if I ask what your local requirements are?

It sounds like Turkey has some requirements that are an interesting problem to solve...

Pariah Zero said:

I’m just curious, but do you mind if I ask what your local requirements are?

It sounds like Turkey has some requirements that are an interesting problem to solve...

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We need to report the location of the main body. The payload needs to have a separate parachute and We need to report it's location too.

jlabrasca said:

The designer is in Turkey.

https://hackaday.io/emrelio

It is possible that he is not familiar with the commercial offerings available to fliers outside of Turkey.

Click to expand...

I've shipped Eggtimer stuff to Turkey.

We'll see if anything ever comes of this. So many of these Hackaday projects end up like his looks right now, a parts list for the major components and that's it. Never any schematics, Gerbers, firmware, etc.