PARTS

Most parts are available on Amazon, Adafruit, Digi-Key, and many other electronics distributors. Please note: Substituting sensors or displays will require different libraries and possibly a change in code!

Open Guage v1 MINI
GPS and Barometer based technology

1x Adafruit metro mini (arduino micro 328 based microcontroller)

1x Adafruit Ultimate GPS breakout board - Product ID 746

1x Adafruit BMP388 precision barometer & altimeter - Product ID 3966

1x Adafruit 1000 Li-Ion charger/5v power supply - Product ID 2465 (or equivalent)

1x Mini SPST rocker switch - 8.5 mm x 13.5 mm (or equivalent)

1x SPST Mini NO push button - 6 mm

1x 1000 mah 3.7v Lithium battery 8.5x25x40 mm (We used makerfocus brand on Amazon)

1x 20x4 LCD display with I2C adapter (We used the HiLetGo green one on Amazon)

wire, 18-24 AWG, 6" (most will be shorter though)

4x M3x15 screws (to attach the bottom of the case to the top)

2x M2.8x8 screws (to attach the charger and GPS/barometer to the bottom)

1x electronics safe silicone adhesive

Recommended: Velcro brand elastic straps, medium (wrist-mounting) or large (leg-mounting)

Amazon link: https://www.amazon.com/hz/wishlist/ls/202RLYXICDZ92?ref_=wl_share

Open Gauge Altimeter Watch

Just Altitude and climb rate for the minimalist's needs

1x Adafruit metro mini (arduino micro 328 based microcontroller)

1x Adafruit BMP388 precision barometer & altimeter - Product ID 3966

1x Adafruit 1000 Li-Ion charger/5v power supply - Product ID 2465 (or equivalent)

1x Mini SPST rocker switch - 8.5 mm x 13.5 mm (or equivalent)

1x SPST Mini NO push button - 6 mm

1x 1000 mah 3.7v Lithium battery 8.5x25x40 mm (We used makerfocus brand on Amazon)

1x 8x2 I2C LCD display, backlit (this one's hard to find, it's right here)

wire, 18-24 AWG, up to 5" (most will be shorter though)

4x M3x15 screws

Recommended: Velcro brand elastic straps, medium
(See above amazon list, omit the 20x4 LCD and GPS module.)

WIRING

This diagram is rough, but uses the exact wiring that created the original Open Gauge. Hard to read? Feel free to contact us, or consider donating so we can hire an artist/engineer who can draw better than we can!