Ember launch controller

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About The Project

Ember is a diy, cheap and open source model rocket along with everything you would need to launch it + detailed guides on actually building it

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Images

Flight Recorder	Flight Recorder 3D	Dashboard
Launch Controller	Launch Controller 3D

Guide

3D Printing

A few of the important parts of the rocket are 3d printed, you could get away with using PLA for them but ABS is better if you have it.

Recommended print settings:

• Layer heigh -> 0.2mm
• Wall lines -> 5
• Infill -> Gyroid 40%
• Top & Bottom layers -> 4

Nose cone

Add normal supports for the lip in the shoulder. It should come off easily

Fins x4

Print it with the fin tab facing the bed and with the Seam corner preference set to Hide Seam

Launch lugs x2

Engine block

Centering rings x2

Launch Controller Body/Panel

Launch Pad Leg/Body

You can just print these with the recommenced settings

PCB/Electronics

The gerber files for both the launch controller and flight recorder are available here

Make sure you would a bit of 22 AWG wires at hand for the panel lights and switches

The Battery is meant to be charged on the bench and then soldered on to the flight recorder

(More detailed guide will come once I get my PCBs)

Flashing the firmware

You need esptool. Install it using

pip install --user esptool

Plug the Super Mini into USB. It should show up as /dev/ttyACM0 on Linux, /dev/tty.usbmodem* on macOS, and COMx on Windows

Flash the firmware using

esptool --chip esp32c3 --port /dev/ttyACM0 --baud 460800 \
        write-flash 0x0 ember.bin

Once done you should see some logs in serial

# pick one
idf.py -p /dev/ttyACM0 monitor
miniterm /dev/ttyACM0 115200
screen /dev/ttyACM0 115200

I (xxx) ember: ember boot
I (xxx) sensors: MPU6050 ready @0x68
I (xxx) sensors: BMP280 ready @0x76 ...
I (xxx) httpd: http server up on :80
I (xxx) wifi_ap: softap up: ssid=ember-XXXXXX ch=1

Connect to the open Wi-Fi ember-XXXXXX and visit http://192.168.4.1 for the dashboard.

License

Distributed under the Creative Commons Attribution-NonCommercial 4.0. See LICENSE.md for more information.

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Contact

HexDump0 - @HexDump0 - root@hexdump0.pw

Project Link: https://github.com/HexDump0/Ember

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Acknowledgments

• SnapEDA for ESP32-C3 SMD Footprint and Symbol
• UltraLibrarian for FS8205A Footprint and Symbol
• RabchikEngineer for KiCad ESP32-C3-SuperMini symbols
• Ulf Hille for ESP32C3 SuperMini 3D Model
• Usini for Usini Sensors Kicad Schematics and footprints (and associated GrabCAD authors)

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