Altitude Hold version of Silverware can be found in AH branch of Silverware.

Added configuration (config.h)

// Springloaded centre is zero throttle
#define USE_STOCK_SPRINGLOADED_TX

// Hold throttle on centered stick
#define USE_STOCK_SPRINGLOADED_HOLD

// Use BARO sensor - type in hardware.h
// #define ENABLE_BARO

USE_STOCK_SPRINGLOADED_TX is used to make use of normal bwhoop springloaded TX. The throttle is centered with springs and this define makes the center position 0% throttle. Pushing down decreases alt (when in BARO or SPRINGLOADED_HOLD mode).

USE_STOCK_SPRINGLOADED_HOLD is a poor man's altitude hold. This makes center throttle 0% throttle, and adds or decreases throttle when pushing or pulling throttle. Center will keep the last throttle, so when carefully adjusted this will keep the drone in place.

ENABLE_BARO Enables Barometer supported altitude hold. This is best used in combination with USE_STOCK_SPRINGLOADED_TX