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Mercury altimeter specifications

The Mercury V1 is a small, smart altimeter packed with high quality sensors. Below are the full specifications across hardware revisions. Revision 3+ boards include upgraded sensors and additional features — the hardware revision is printed on the back of the PCB near the battery connector.
You can also find out your revision via the onboard Wifi webserver, the Altimeter Cloud or via Serial data over the USB connection port.

Physical

Specification

Rev 1 & 2
Original & first update

Rev 3+
Current production

Dimensions (PCB)

30.0 × 16.9 × 12.3 mm

30.0 × 16.9 × 10.8 mm

Dimensions (in case)

39.4 x 19.0 x 13.9 mm

39.4 x 19.0 x 12.8 mm

Weight (out of case)

4.6 g

Weight (in case)

7.2 g

7.3 g

Weight (in ebay mount)

6.4 g

Min tube diameter (no case)

18.0 mm

17.0 mm

Min tube diameter (with case)

22.0 mm

21.7 mm

Case material

Black nylon

Connector

USB-C

Mounting

Case, Ebay mount, Custom

Pressure sensor & altitude

Specification

Rev 1 & 2

Rev 3+

Pressure sensor

Bosch BMP390

Bosch BMP581

Pressure range

300 – 1250 hPa

Max reliable altitude

~9,200 m (30,000 ft)

Sensor output rate (default)

50Hz

80Hz

Samples per second (default)

400

1280

Temperature compensation

Automatic

Filters

Kalman + IIR + oversampling (configurable)

Launch pressure reference

Dynamic (updates while waiting)

Accelerometer & gyroscope (IMU)

Specification

Rev 1 & 2

Rev 3+

Accelerometer

3-axis

Accelerometer range

± 32 G per axis

Gyroscope

3-axis

Gyroscope range

± 2,000 °/s

IMU sampling rate

102 Hz

Tilt from vertical

Yes

Pitch, roll & yaw angles

Yes

IMU fusion filter

Madgwick or Mahony (6-axis)

Data logging

Specification

Rev 1 & 2

Rev 3+

Overall sample rate

100 Hz

Max samples per flight

12,000

Recording time per flight

~8 mins in 1:5 hybrid mode

Logged data

Time(ms), Altitude, Velocity, Tilt from vertical, Roll, Pitch, Yaw, Acceleration magnitude, Acceleraion (XYZ axis), Gyroscope (XYZ axis), Board temperture, External sensor temperature, Air brake servo percent, Air brake target alttiude, Predicted altitude, Air density, Air pressure.

Flight event detection

Launch, motor burnout, apogee, deployment(s), landing, ejection, rules start and end, output triggers.

Recording stop

Automatic (450 or 900 samples stable) or Manual button press.

Flight log recovery

Yes — automatic recoverable flash buffer if device crashes or fails before flight log is written.

Flight log format

Altimeter Cloud upload over WiFi & CSV files

Connectivity

Specification

Rev 1 & 2

Rev 3+

WiFi

2.4 GHz 802.11 b/g/n

WiFi modes

Access point (direct connect) + Internet WiFi (Altimeter Cloud)

Cloud upload

Automatic via WiFi

USB

USB-C (charge, serial, config)

WiFi TX power

Configurable

Configurable via Altimeter Cloud

Yes, just turn on WiFi mode and load the website.

Internal web server

Yes (access point mode)

Power & battery

Specification

Rev 1 & 2

Rev 3+

Battery type

Internal rechargeable LiPo (1S 50mAh)

Battery life (flight mode)

7+ hours

Charging

USB-C (from phone, laptop, etc.)

Charge indicator

5-LED indicator on front of PCB when turned on (except revision 1), seperate charge LED indicator that goes out when charged.

Charge time

~1 hour from empty

WiFi mode power draw

~120 mA avg

Flight mode power (emode 1)

7.9 mA avg

7.8 mA avg

Flight mode power (emode 2)

5.3 mA avg

5.2 mA avg

Max safe board temperature

55 °C (due to LiPo)

Outputs & expansion

Specification

Rev 1 & 2

Rev 3+

Programmable output ports

GP6, GP7

Onboard high current output

Yes (1x 8-12A max)

Output types

1x High current, 2x GPIO ports (servos / IO), 1x I2C expansion port, 1x USB port, 1x RXP port

Servo expansion (PCA9685)

Up to 6 channels

High current output board

Supported

External temp sensor (MT1)

Supported (I2C)

Action rules system

Configurable conditions & actions (6 rules)

Predicted apogee & air brakes

Supported (configurable Cd, area, mass)

Software & features

Specification

Rev 1 & 2

Rev 3+

Firmware updates

Via Altimeter Cloud website using USB port.

Configuration

Via Altimeter Cloud website (WiFi) or USB

Altimeter Cloud charts

Altitude, velocity, acceleration, gyroscope, tilt, pitch/roll/yaw, temperature, predicted apogee, air density

Flight log sharing

Direct link, embeddable chart, image export

Storage limits

Unrestricted (no limit) on the altimeter cloud

Accidental launch protection

Yes (configurable threshold)

Status LED

Multi-colour (state, battery, WiFi)

LED brightness

Configurable

Flight animation

Yes, based on actual flight data.

Predicted apogee

Yes

Configurable rules

Yes (6)

Specifications are subject to change with firmware updates. Some features require the latest firmware version. The hardware revision number is printed on the back of the PCB. If you are unsure which revision you have, please contact us.