The pressure altimeter works on the principle that the pressure of air varies in a known way with height. After power on, it measures the pressure value for zero level. Then, it measures pressure values and calculates a height difference from the zero level.

Measured altitude samples are stored into EEPROM memory. Every 10th sample is a temperature value. Altimeter has an UART interface with defined commands. So, it can works in stand alone mode or in UART operation mode. The USB cable with USB-UART converter is used for communication with PC software, which enables to download records and config the altimeter.

Altimeter encapsulated in a heatshrink.

General Features

Very miniature dimensions - 15x18 mm 1.5 g, with solid heatshrink and glue 2.5 g.
Wide range of supply voltage from 2.8 V to 16 V. Contains 3.0 V voltage regulator.
Altitude resolution 0.1 m. Temperature resolution 0.1 °C.
Large EEPROM memory (256 kb) for measured samples. The capacity is for 16000 samples (16-bit).
Bootloader - enables to upgrade firmware using USB cable.

Stand Alone Operation Mode

Just connect the battery and altimeter starts to measure and store samples.
Suitable for RC model, free flight model or for trip to mountains.
Adjustable parameters by PC software - time step, altitude trigger, max. record length.

UART Operation Mode

It can communicate with some device via UART interface (addressable mode).
Several commands (start / stop measuring, read measured height / pressure / temperature, execute sleep mode).
Ideal for Timer T10 - After launch, it starts to measure and store samples. Timer can read a sample at any time and store them to its memory. After DT, altimeter executes a sleep mode.
The stored record includes: measured altitude and temperature, model code (received from timer), times when Timer changes its mode (fast glide, glide, DT, etc).