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Alt15/WD Altimeter

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Replaced by Pnut and APRA
Shipping Weight:
0.25 LBS
Minimum Purchase:
1 unit(s)

Product Description

This tiny, easy to use altimeter audibly reports your rocket's peak altitude after flight via a sequence of beeps. It also stores a flight curve (altitude vs. time) which can be downloaded to your computer using the optional data transfer kit DT3U.

Download the Operation Manual for this product.


  • Precision sensor records flights up to 15,000 feet above sea level
  • All data are stored in nonvolatile memory and are preserved even if power is lost
  • Advanced firmware algorithms detect apogee properly even during Mach speed flights
  • High performance A/D and precise factory calibration for superior accuracy
  • Rugged SMD construction, stringent QC testing, and internal self-diagnostics assure reliability
  • Miniature type A23 12V battery provides over 20 hours of continuous operation
  • Measures just 3.1"L * 0.55"W * 0.55"H, fits in 18mm BT20, weighs 0.5 oz. with battery
  • Backed by a full three year warranty

New Features for Rev2 Version:

Expanded flight memory
The most recent three flight curves are now stored in nonvolatile memory for download. This eliminates the need to download the flight curve after each flight; three flights can be made between downloads. All data are preserved even with power off.

User selectable Launch Detect Threshold
Launch detect can be set from 40' to 250' above ground using the computer interface. Lower values allow data to be gathered from low altitude flights, higher values offer more resistance to false triggering due to wind gusts.

Improved 16 bit A/D conversion
Reports peak altitude to nearest foot. One foot resolution in stored flight data provides smoother, more useful flight curves even with low altitude flights.

Power switch connector
Use the supplied shunt as a simple ON/OFF switch, or attach an external switch with the optional cable. This reduces wear and stress on the battery holder by allowing the battery to be left in place between flights. An external switch can also simplify the rocket preparation process.

Brown Out protection
The altimeter can survive a 2 second loss of power without affecting operation. If the battery or switch terminals break connection momentarily during hard acceleration or chute deployment shock, the altimeter will continue to operate properly.

Built-in battery voltmeter
Reports the current battery voltage on power-up. No more guessing about whether the battery is good or bad.

Low battery alarm
Sounds a continuous tone if battery voltage drops below 5.5 volts.

Power loss detection
The altimeter will sound a distinctive hi/low alarm tone sequence on powerup if power was lost during the last flight.

Mounting holes for increased mounting flexibility
Use the supplied mounting hardware to attach the altimeter to a mounting plate in your rocket, or just slip it into a padded tube as was done previously.

More accessible data connector
The connector has been moved to the edge of the circuit board for easier access.


3.1"L x 0.55"W x 0.55"T
15 grams (with battery)
operating voltage:
12V nominal (6V - 16V)
operating current:
2.0 ma typical
sampling rate:
10 samples per second
sample memory:
3 flights * 2304 samples (3.84 minutes) per flight
maximum altitude:
15,000 feet MSL
1' over entire range
launch detect:
adjustable from 40' - 250' AGL; 80 feet AGL default
altitude accuracy:
+/- (0.25% reading + 2')
operating temp:
0C to +70C

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