User`s manual

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The Eggtimer TRS works in conjunction with the Eggfinder receivers, either the Eggfinder RX
“dongle” receiver that plugs into the USB port of your computer, or the Eggfinder LCD handheld
receiver that displays GPS coordinates and altitude in real-time during your flight. Whichever
one you use, we recommend that you build the Eggtimer TRS transmitter board first, because it’s
easier to tell if it’s working, and when you have the receiver completed it will be easy to tell if
that one is working too since both boards have LEDs that tell you if they are
transmitting/receiving data.
Eggtimer TRS Features
Altimeter Features
Altimeter rated to 29,500 ft ASL, resolution to approx 1 ft.
Logs data for last 32 flights, “beeps” out or transmits maximum altitude after flight
Flight data can be downloaded to a computer using USB interface cable (included) to .CSV format, for
use with virtually any spreadsheet, graphing, or statistical analysis software package
Reports Elapsed Flight Time, Altitude @ Time, Raw Velocity @ Time, and filtered Altitude and Velocity
@ Time
Flight memory is non-volatile, so all settings and flight data are retained with the battery disconnected,
and interrupted flights can still produce a data graph up to the point of failure (or impact…)
Fully configurable Main deployment altitude & Drogue at nose-over/delayed (for use as a backup)
Supports igniters with a voltage rating of up to 60V, up to 8A, 65W maximum
Uses optoisolators and bipolar driver transistors for total isolation of computer and ignition power and
immunity from false ESD or RF triggering and “brownout” protection
Uses separate battery (not included) for external deployment device, providing total immunity from
deployment brownouts. Can also be used with a single 2S LiPo battery (350 mah min. recommended)
GPS/Tracking Features
Range approx. 10,000’ with included wire antenna, double that with external antennas
Sends real-time altitude, deployment channel status, and GPS coordinate information to an Eggfinder
receiver
Allows you to track your rocket in flight, and walk right up to it afterwards
9 Frequencies and 8 ID Codes, up to 72 Eggtimer TRS units can be flown simultaneously