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                                                         Altimeter ALT-USB  and  ALT-LED

Instruction and   program

New software version (V12_2013)  print and save chart, export data to Excel

Electronic ALT-USB was used on XVIII World Championships in Space Modelling in Serbia 2010, European Championships in Romania and World Championships in Slovakia. This year new, improved version of ALT-USB altimeter, ALT-BMP altimeter will be used at European Championships as well as next year at World Championships in Bulgaria.

We offer smaller, improved version of previous altimeter. ALT-BMP contain bigger memory and upgraded software which prevents from accidental measurement start due to wind or other changes in pressure,

The ADREL company is certified by National Air Sport Control - Polish Aeroclub, allowing ALT-USB altimeter to measure the altitude of national and international competitions

In accordance with the FAI recommendations, the measurement of altitude in the categories S1 and S5 is to be measured electronically with the use of altimeters. According to these guidelines altimeter has been developed, which in addition to measuring the maximum altitude, stores measurement results for the entire flight. Its parameters were adjusted to the recommendations of the FAI. Altimeter’s size and weight (1.2 g) allow for its inclusion in all types of space models. Altimeter may also prove useful when setting F1B model category (eg, choice of propeller).

Model altimeter ALT-USB is used for measuring the altitude of the model and for the analysis of the flight. Altimeter records 32 measurements before takeoff, the flight measurements and 32 measurements after landing. Detection of the model take-off is carried out automatically (you can adjust the altitude, at which  take-off is detected). Landing is also detected automatically. Measurements are stored in non-volatile memory,  they are remembered after you disconnect the power supply. Frequency of measurement is set in the range of 50 measurements per second to 1 measurement every 5 seconds.

The readout of the ALT-USB altimeter’s measurements and parameters  is possible when cable is connected to the USB connector on your computer. There is a need for additional adapter (in the pricelist Adapter - Charger). The chart shows the entire flight of a rocket. The graph can be zoomed. Measurements of the flight can be saved on your computer and then played back. Graph of the current operation may be imposed on the chart with a previously recorded flights. This allows you to compare flights with different settings. In addition, the current temperature is displayed. For the purposes of competitions altimeter is able to store the starting numbers of competitors. In addition, each altimeter has a recorded permanent unique serial number. For archiving the results of competitions, the measurements can be saved to disk and retrieved any time. Altimeter’s software allows you to automatically send data to excel sheet. The number of competitors, altimeter’s serial number, the maximum altitude are sent. Thanks to this registration of results is a simplified to the maximum.

Adapter - Charger used to connect the altimeter to a computer using a standard USB cable with the tip of a type B. Using the program one can read and archive the results of the program (as described above). Adapter has a built-in complete control system of battery recharge (single-cell Li-Pol). System charges the battery with a current of about 50 mA (using the resistor you can change the current up to 400mA). The charger signals the end of charging via a LED. As a power source, you can use your computer (USB) or any charger for mobile phones that has an USB connector.

Recommended battery: Li-Pol 50mAh, weight 2 grams (with wires), Li-Po 20mAh, weight 1gram

Multi-charger is used for charging 1 to 20 batteries. Multi-charger can be used during the championship. At the same time can be charged the twenty batteries. Each battery has a separate charging controller. Each battery is charged current 50mA. Charger is powered voltage 5V/1,2 A. Can be used to supply power from an old computer.

Detailed instruction altimeter and method of assembly is located in the section "download".

  ALT-USB basic parameters

 Method of Measurement

Measurement of pressure changes

 Measuring Range

0-5500 m


0.2 m  (for the frequency of measurements < 25 meas. /sec)
1 m (for 25 and 50 meas. /sec)

 Accuracy of measuring the difference of altitude

1 %

 Supply Voltage

3,6V  to 6V

 Frequency of measurement

1, 2, 5 seconds / measurement
5, 10, 15, 25, 50 measurements / second

 Detection of take-off

set in the range of 2m - 100m


9,5 x 22 x 8 mm   (with connector)


1,2 grams

 Current consuption

5,9 mA

 Battery life

for LiPo 50mAh - 8 hours
for LiPo 20mAh - 3 hours

 Memory size

4000 measurements

    Altimeter  ALT-LED


We also offer ALT-LED altimeter. Result of the measured altitude is presented by blinking LED. Altimeter is permanently set at the sampling frequency: 10 measurements per second. The measurement starts after reaching the height of 20m. The measurement ends after reaching the take-off altitude. The measurement results are averaged. The maximum output is stored and shown. Reading of measurement is always after powering-up of the altimeter. Measurement can deleted by shorting the pins. Each altimeter has a unique serial number, which can be read from a blinking LED.

   ALT-LED  basic parameters
 Method of Measurement  Measurement of pressure changes
 Measuring Range   0-5500 m
 Accuracy of measuring the difference of altitude  1 %
 Supply Voltage  3,6V  to 6V
 Frequency of measurement 15 measuremets / second
 Detection of take-off  30m
 9,5 x 22 x 8 mm   ( with connector)
 Weight  1,2 grams
 Current Consumption  5,9 mA
 Battery life
 for LiPo 50mAh - 8 hours
 for LiPo 20mAh - 3 hours

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