159 lines
5.6 KiB
PHP
159 lines
5.6 KiB
PHP
== TeleMini
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.TeleMini v3 Board
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image::telemini-v3.0-top.jpg[width=400]
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image::telemini-v3.0-bottom.jpg[width=400]
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TeleMini v3 is 0.5 inches by 1.67 inches. It was
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designed to fit inside an 18mm air-frame tube, but using it in
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a tube that small in diameter may require some creativity in
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mounting and wiring to succeed! Since there is no
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accelerometer, TeleMini can be mounted in any convenient
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orientation. The default ¼ wave UHF wire antenna attached to
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the center of one end of the board is about 7 inches long. Screw
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terminals for the power switch are located in the
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middle of the board. Screw terminals for the e-matches for
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apogee and main ejection charges depart from the other end of
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the board, meaning an ideal “simple” avionics bay for TeleMini
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should have at least 9 inches of interior length.
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=== TeleMini v3 Screw Terminals
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TeleMini v3 has four screw terminals on the end of the
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board opposite the telemetry antenna. Two are for the apogee
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and two are for main igniter circuits. Another two
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screw terminals are located in the middle of the board
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for the power switch. Using the
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picture above and starting from the top for the pyro terminals
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and from the left for the power switch terminals, the
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connections are as follows:
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.TeleMini v3 Screw Terminals
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[options="header",grid="all",cols="2,3,10"]
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|====
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|Terminal #|Terminal Name|Description
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|1
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|Apogee -
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|Apogee pyro channel connection to pyro circuit
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|2
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|Apogee +++
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|Apogee pyro channel common connection to battery +++
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|3
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|Main -
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|Main pyro channel connection to pyro circuit
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|4
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|Main +++
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|Main pyro channel common connection to battery +++
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|Left
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|Switch Output
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|Switch connection to flight computer
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|Right
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|Switch Input
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|Switch connection to positive battery terminal
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|====
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=== Using a Separate Pyro Battery with TeleMini v3
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As described above, using an external pyro battery involves
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connecting the negative battery terminal to the flight
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computer ground, connecting the switched positive battery
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terminal to one of the igniter leads and connecting the other
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igniter lead to the per-channel pyro circuit connection.
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Because there is no solid ground connection to use on
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TeleMini, this is not recommended.
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The only available ground connection on TeleMini v3 are
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the two mounting holes next to the telemetry
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antenna. Somehow connect a small piece of wire to one of
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those holes and hook it to the negative pyro battery terminal.
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Connecting the positive battery terminal to the pyro
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charges must be done separate from TeleMini v3, by soldering
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them together or using some other connector. Note that you
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must include a switch in the pyro battery positive lead for
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safety!
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The other lead from each pyro charge is then inserted into
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the appropriate per-pyro channel screw terminal (terminal 3 for the
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Main charge, terminal 1 for the Apogee charge).
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=== Using an Active Switch with TeleMini v3
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As explained above, an external active switch requires three
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connections, one to the positive battery terminal, one to
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the flight computer positive input and one to ground. Again,
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because TeleMini doesn't have any good ground connection,
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this is not recommended.
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The positive battery terminal is available on the Right
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power switch wire, the positive flight computer input is on
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the left power switch wire. Hook a lead to either of the
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mounting holes for a ground connection.
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=== Using Packet Link Mode with TeleMini
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After TeleMini powers up, it will check to see if some
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device is attempting to communicate with it using
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Packet Link Mode. If so, it will switch to idle mode
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and start communicating. To switch to flight mode,
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reboot the device either over the radio link or by
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powering it off and back on.
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If no ground station is attempting to communicate
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using Packet Link Mode, TeleMini will enter pad mode
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and prepare for flight.
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The sequence of operations to use Packet Link Mode
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with TeleMini is:
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1. Configure the ground station data rate, frequency
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and callsign to match the TeleMini settings.
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2. Start Packet Link Mode in the ground station by
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selecting the desired operation (Safe Flight Data,
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Configure Altimeter, Fire Igniter or Monitor
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Idle). Select the TeleBT or TeleDongle device. The
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red LED should begin flashing rapidly.
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3. Turn on TeleMini. You should see the red LED flash
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very rapidly during the initial communication burst,
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but it should then slow down when the link is idle.
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Once TeleMini is in Idle mode, it will stay in that
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mode until rebooted. That means you can stop one
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Packet Link operation, wait a while and start another
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Packet Link operation.
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=== Forcing TeleMini radio parameters to known defaults
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If you don't know what the TeleMini frequency and
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callsign settings are, you can temporarily force it
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back to the original default values (frequency
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434.550MHz, callsign N0CALL) by connecting a wire
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between hole 3 and hole 6 on the debug connector. Hole
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3 has the square pad around it, hole 6 is the one
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nearest the MS5607 baro sensor, which is a rectangular
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component with a metal cap that has two holes in it.
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Once TeleMini has been powered up with this wire
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connected, the wire may be removed. The radio
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parameters will stay set to these default values until
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changed by the user or when the device is rebooted.
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=== TeleMini v1
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TeleMini v1 is the earlier version of this product. It
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has a lower-power radio, less storage, no beeper and
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soldered-in wires instead of screw terminals for the
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power switch.
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.TeleMini v1 Board
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image::telemini-v1-top.jpg[width=400]
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