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