https://github.com/platypii/mohawk
Helmet mounted wireless GPS for wingsuit, skydive, and BASE jumping
https://github.com/platypii/mohawk
arduino esp32 gps helmet jscad platformio wingsuit
Last synced: 6 months ago
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Helmet mounted wireless GPS for wingsuit, skydive, and BASE jumping
- Host: GitHub
- URL: https://github.com/platypii/mohawk
- Owner: platypii
- License: mit
- Created: 2020-07-10T01:13:58.000Z (about 5 years ago)
- Default Branch: master
- Last Pushed: 2023-09-04T00:38:56.000Z (about 2 years ago)
- Last Synced: 2025-04-12T23:49:46.395Z (6 months ago)
- Topics: arduino, esp32, gps, helmet, jscad, platformio, wingsuit
- Language: C++
- Homepage: https://baseline.ws/
- Size: 415 KB
- Stars: 2
- Watchers: 2
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# BASEline Mohawk GPS
[](https://github.com/platypii/Mohawk/actions)
[](https://opensource.org/licenses/MIT)
Mohawk is a helmet mounted wireless GPS for wingsuit, skydive, and BASE jumping.
The key advantages are:
- Wireless data streaming to BASEline app
- Aerodynamic shape conforms to most helmets
Mohawk is open source, designed for makers.
Using cheap components, soldering, and a 3D printer, you can make your own Mohawk GPS.
## Components
- TinyPICO ESP32 microcontroller $30
- Beitian BN-180 GPS $20
- 3.7V 200mAh LiPo battery 502025 $8
- Slide switch
- LED status light
- 3D printed case
- M3 screw
## Wiring
```
+-------+
|23 BAT|-------+
|19 GND| |
|18 5V| |
|5 3V|-----+ |
|22 4| | o
LED-|21 14| | \
+---|32 15| | o
| +-|33 27| | |
| | |RST 26| | |
| | |GND 25| | |
| | +-------+ | |
| | | |
| +-------------+ | |
+-------------+ | | |
| | | |
+-------+ | | | |
|GPS |-+ | | |
| |---+ | |
| +|-----+ |
| -|--o |
+-------+ |
|
+-------+ |
|Batt | |
| -|--o |
| +|-------+
| |
+-------+
```
## Assembly
Connect the components according to the above schematic.
Use thin-guage wire of the appropriate length.
## Firmware
Mohawk firmware runs on small ESP32 dev boards, using the arduino framework.
These are cheap but powerful microcontrollers. PlatformIO is used to manage the software.
### Program the device
Install Visual Studio Code and PlatformIO.
In VSCode, open the `arduino` directory of this repository.
Connect the ESP32 to the computer by USB.
Use the PlatformIO "Upload" function to program the device.
## Mohawk Protocol
Mohawk GPS sends location data via Bluetooth Low Energy (LE).
The protocol is a custom protocol designed to compress information to as little data as possible.
The goal is to minimize the time broadcasting on the bluetooth radio.
This helps reduce interfere with GPS, and saves battery power.
Mohawk location message fields:
| field | size | description |
| --- | --- | --- |
| msg_type | 1 byte | 'L' |
| time | 3 bytes | three least significant bytes of tenths since epoch |
| latitude | 4 byte int | microdegrees |
| longitude | 4 byte int | microdegrees |
| altitude | 2 byte short | decimeters above -100m MSL |
| vN | 2 byte short | velocity north cm/s |
| vE | 2 byte short | velocity east cm/s |
| climb | 2 byte short | climbrate cm/s |
The 2 byte fields `altitude`, `vN`, `vE`, and `climb` represent `NaN` as maximum short value `0x7fff`.