README.md

diyaltimeter.de

The idea is to create an open source altimeter for skydiving. Currently the hardware is based on standard components connected with a custom pcb. So you can just order the pcb from JLCPCB and the rest of the parts from Aliexpress. The cost should be <50$ depending on the type of housing you choose.

Features ( incl. Wishlist)

General

• OTA firmware updates
• keep logbook on internal storage
  • jump number
  • exit altitude
  • ff time
  • deployment altitude
  • cp time
  • plane
  • location
  • date/time
• sync logbook via WiFi (Wishlist - needs a backend)

Ground

• sleep mode to save energy
• check pressure every xx seconds
• wake up on button press or climb detection

Airplane

• date/time
• altitude
• climb rate
• time to altitude

Freefall

• altitude
• numbers as big as possible on screen

Canopy

• altitude
• descent rate

Hardware:

• ESP32 ( LOLIN D32 V1.0.0 - Aliexpress ~10$
  • built in LiPo charger
• 2x BMP280 sensors Aliexpress (make sure to get the 6 pin version! Else you can't change the I2C address of the second sensor) ~2$
• 2.42" OLED SPI display Aliexpress ~20$
• 2.500mAh LiPo battery ~10$
• D3231 RTC module Aliexpress ~1$
• 3 buttons ~1$
• custom PCB
• 3D printed housing with wristmount

Test setup: