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Graupner MX-20 Radio Transmitter


Introduction

The MX-20 HoTT is an ideal transmitter for the MikroKopter.  Groupner has made an effort to work with Mikrokopter to meet the needs of the MK Community. Graupner HoTT technology offers extreme reliability in use, with bi-directional communication between transmitter and receiver, integrated telemetry, speech output via earphone socket and ultra-fast response times.

HoTT (Hopping Telemetry Transmission) is the synthesis of expertise, engineering and world-wide testing by
professional pilots. The equipment operates on the 2.4 GHz band, and offers bi-directional communication between
transmitter and receiver via a down-link channel integrated into the receiver.

Note: Main features

Note: The primary reason MK owners are upgrading to the Graupner MX 20 is the security and reliability of the transmitter/receiver combination and the ability to view live MK telemetry on the transmitter window.

Overview

Data:

  • 12 channels for Switches and Potis
  • 2,4GHz transmission system
  • Bi-directional communication between transmitter and receiver
  • Display of the Mikrokopter telemetry on an illuminated 8x21 character LCD
  • Voice output of the telemetry values
  • 7 switches (2 three-way-switches, 3 two-way-switches and 2 buttons)
  • 3 analogue potis
  • Inbuilt DSC socket for connection of flight simulators (AeroSim) or a TrainerMode system

  • Over 200 systems can be used simultaneously -> No arrangement on channels like at 35Mhz systems

  • Futureproof with the update capability via USB interface (HoTT update)
  • Five different menu languages??: German, English, French, later Italian and Spanish possible via software update
  • The telemetry can be logged on a microSD card in the transmitter

Notice: supported Hardware and Software

Notice: The HoTT telemetry is only supported by FlightControl 2.1.

The FlightControl-Firmware includes the HoTT-Telemetry since Firmware Version 0.86 and higher





http://mikrocontroller.com/files/HoTT/MX-20_pult_blau.jpg

http://mikrocontroller.com/files/HoTT/MX-20a.jpg

http://mikrocontroller.com/files/HoTT/MX20_connections.jpg

Manual for the MX-20

The manual can be downloaded here: Programming Manual

  • The English manual is named "33116_mx16_HoTT_2_gb.pdf". This is the same manual as for the MX-20, but only with 8 channels.

MX-20 Button Operation

Buttons to the left of the screen
ESC button
A brief press on the ESC button returns you step by step within the function select system, taking you right back to the basic display. If you make a change in the meantime, the change is retained. If touched for about three seconds in the base display, ESC opens and closes the Telemetry menu.

Arrow buttons
1. A brief press on one of these buttons allows you to leaf through lists, such as the Model Select or Multi-Function list, always moving in the direction of the arrow; the arrow buttons are also used to move through menu lines within menus.
2. A brief simultaneous press of the (Arrow Left/Arrow Right)(Arrow Up/Arrow Down) buttons switches from the base transmitter display, and from almost any menu position, into the “Servo display” menu.

Buttons to the right of the screen
SET button

1. Starting from the base screen display - as it appears when you switch the transmitter on - a brief press of the SET button takes you to the multifunction menus. You can also call up a selected menu using the SET button.

2. Within the set-up menus you can activate (confirm) and disable the corresponding set-up fields with a brief press of the SET button.

Arrow buttons
1. “Leafs through” the multi-function menu and the menu lines within the set-up menus, in the same manner as the left-hand touch-key’s arrow buttons.

2. Selects and adjusts parameters in set-up fields after you have activated them by briefly pressing the SET button; the buttons (Arrow Right/Arrow Up) and (Arrow Left/Arrow Down) are assigned the same function in each case, i. e. it makes absolutely no difference which of the two buttons you use.

3. A brief simultaneous press of the (arrow Up/Arrow Down) or (Arrow Left/Arrow Right) buttons resets an altered parameter value in the active input field to the default value (CLEAR).
Notes:
• It is not the contact with the touch-key itself that triggers the corresponding action, but the cessation of the touch.
• If you switch the transmitter off and then immediately on again, you may find that the touch-keys have no effect. This is not a fault! Switch the transmitter off again, and wait a few seconds before switching it on once more.


Configure the transmitter

Choose a language

The language can be selected at the transmitter. This can be done in the menu HIDDEN MODE.
Here are the steps:

  • Transmitter ON.

  • Press both arrows (up/down) from the left and SET of the right side together.

  • After ~one sec. you should see the menu HIDDEN MODE.

  • In this menu you can change the language of LANGUAGE and VOICE.

  • Now you can chose with the arrows (up/down) the menu which you want to change.

  • With SET you can start the changing of the chosen menu.

  • With ESC you can stop the changing of the chosen menu.

(See also english manual "33116_mx16_HoTT_2_gb.pdf", Page 26)

Set Stick Mode

Change the transmitter to stick mode 2. With this the transmitter will be set to "gas left".

  • Press "SET" in the opening screen to get into the settings
  • Select "Base setup model" with Up / Down
  • Select "Stick mode" under "Basic Settings"
    • scroll down once
    • select the value with "SET" and change it to 2 with Up/Down
    • Save with "SET"

http://mikrocontroller.com/files/HoTT/SET.gif http://mikrocontroller.com/files/HoTT/base.gif http://mikrocontroller.com/files/HoTT/mode2.gif

Channel assignment at mode 2:

  • Channel 1 = Throttle
  • Channel 2 = Roll
  • Channel 3 = Nick
  • Channel 4 = Yaw

Spring in the transmitter

By default there is a spring at the gas stick which keeps it always in the center position.

If you want to fly with vario-height regulator all the time, you don't need to remove the spring.

You should set the "Vario Neutral point" to 127 in the setting (EasyConfig):

http://mikrocontroller.com/files/pictures/EasyCfg_pfeil.gif

If you prefer a notch instead of a spring, you can read in the Manual on page 18.

Binding

Transmitter and receiver have to be bound together, so that the receiver only reacts to that transmitter.

  • When turning on the transmitter you see the message RF ON / OFF. Choose OFF.

  • The receiver have to be supplied with 5V (via 3-core-wire from the FlightControl)

  • Press "SET" in the opening screen to get into the settings
  • Select "Base setup model" with Up / Down
  • Select "RF BIND" under "Basic Settings" -> don't press SET yet

    • Only if there is already a "BIND", press once "SET" to get a "n/v".
  • Now hold down the button at the receiver for 3 seconds until the red and green LEDs light together (maybe difficult to see that clearly)
  • Press "SET" within 3 seconds (in the row "RF BIND)
  • "Finding" appears in the display
  • "RF BIND [bind]" appears in the display at success and the green LED lights continously at the receiver

http://mikrocontroller.com/files/HoTT/bind1.gif http://mikrocontroller.com/files/HoTT/bind4.gif http://mikrocontroller.com/files/HoTT/bind2.gif http://mikrocontroller.com/files/HoTT/bind3.gif

Set the receiver to sum-signal

The Mikrokopter needs a so-called sum-signal. All channels of the receiver are included in it. This makes the wireing a lot easier compared to normal servo-receivers.

  • The receiver has to be turned on and bound
  • Hold down "ESC" at the transmitter for about 2 seconds -> You get into the menu "Telemetry"
  • Select "SETTING & DATA VIEW" (press down and SET)
  • You get into a menu which is generated by the receiver
  • Switch to the menu "RX SERVO TEST" by pressing "right" 5 times
  • Select "CH OUT TYPE" and set to "SUMO" with Up/Down
  • Confirm with SET.
  • You get to the data field with the number of channels in the sum-signal. Set this to "12" with Up/Down

http://mikrocontroller.com/files/HoTT/ESC.gif http://mikrocontroller.com/files/HoTT/telemetry.gif http://mikrocontroller.com/files/HoTT/SUMO.gif http://mikrocontroller.com/files/HoTT/SUMO12.gif

Note: Sumo

INFO - SUMO 12 Setting

If you hold down the button (accidentally) at the receiver while connecting, the "SUMO 12" setting will be deleted. This can be also happen if you connect the receiver with a powered up Mikrokopter and hold down the button. In this case you have to set this setting again.

If you don't have a number behind SUMO, you have to update the transmitter. How to update the transmitter you can see here: Update


Assign channels

Here the required switches and potis of the transmitter will be linked with the transmitted channels.

  • Press "SET" in the opening screen to get into the settings
  • Select "Control Adjust" with Up/Down
  • Turn the switch to the desired "OFF"-position (with this, the direction of the switsch will be set)
  • Select "Input x" and confirm with SET.
  • Move desired switch
  • Repeat the operations for the channels 5-12

http://mikrocontroller.com/files/HoTT/channel1.gif http://mikrocontroller.com/files/HoTT/channel2.gif http://mikrocontroller.com/files/HoTT/channel3.gif http://mikrocontroller.com/files/HoTT/channel4.gif

Examples for the channel assignment

  • Channel 5 -> Two-way-switch right 2 (SW2) -> for height switch e.g.

  • Channel 6 -> Three-way-switch right down 10 (CTRL 10) -> for GPS e.g.

  • Channel 7 -> Rotary poti left (CTRL 6) -> for camera tilt e.g.

  • Channel 8 -> Two-way switch right 3 (SW3) -> for CareFree e.g.

  • Channel 9 -> Three-way switch left down 9 (CTRL 9)

  • Channel 10 -> Two-way-switch left down 8 (SW8) -> for lightning e.g.

  • Channel 11 -> Rotary poti middle (CTRL 7) -> for parameter e.g.

  • Channel 12 -> Button right down (SW 9) -> for triggering the camera e.g.

http://gallery.mikrokopter.de/main.php/v/tech/MX-20.jpg.html

Example Setting Download

 A "ready to use" Setting like above for MODE 2 you can download here: MX-20

After unpacking the downloaded .zip-file, you can copy the folder "Models" directly to the SD-card.
If there is already an folder "Models" / "mx-20" on the SD-card, you can copy the "aMK-Set.mdl" directly into this folder.

How to import/export a setting on the SD-card, you can read in the manual on page 22 + 53/54.

INFO:
In this setting the clock named Stop is activated. Once the throttle stick is moved up the clock starts. If the throttle stick is down, the clock stopps. To set the clock back to zero, you need to push together the up/down button of the right Touch-pads. Or swich off/on the transmitter.

TIP: If you will use a other Mode as Mode 2, you can use the "ready to use" Setting too.
Load the setting into the transmitter and change the Mode manually.
The sticks will then have the function of the Mode (1,3,4) you set. All other channels/switch are so as in the example.

Check Channels in the KopterTool

You can check the channel assignment in the KopterTool, by using the corresponding switch/poti at the transmitter and observe the amplitude of the signal.

http://mikrocontroller.com/files/HoTT/EasyChannel.gif

Note: Receiver Setup

Note:
  • The Receiver Type has to be "Graupner HoTT"
  • Thereby the telemetry is activated and the correct channel-offset is set.(otherwise the zero-values were at 133 instead at 128)
  • If you change the Receiver Type, you have to save this setting into the MikroKopter first to make the changes noticeable.
  • The amplitudes of the sticks (Nick/Roll/Gas/Yaw) have to be 127 or 128 in middle-position. If necessary you can adjust it with the trim-buttons (beside the sticks)

http://mikrocontroller.com/files/HoTT/GR16_b.gif

http://gallery.mikrokopter.de/main.php/v/tech/FC21_Jeti_1.jpg.html

Receiver

Receiver GR-12

The GR-12 HoTT is a 6-channel receiver, which you can upgrade to 16 channels via sumsignal (depends on transmitter).

The range is with this receiver according Graupner 2000mtr.

Output for the sum-signal

http://gallery.mikrokopter.de/main.php?g2_view=core.DownloadItem&g2_itemId=92838&g2_serialNumber=2

  • "sum-signal" must be activated (see: "Set the receiver to sum-signal").
  • The receiver has to be bound to the transmitter (see: "Binding").
  • The sum-signal is on output 6.

Telemetry

The receiver has a separate data channel at output 5 for the MikroKopter telemetry:

http://gallery.mikrokopter.de/main.php?g2_view=core.DownloadItem&g2_itemId=92844&g2_serialNumber=2

To receive the telemetry over here, you have to change output 5 first.
For this, press in the main window ESC for 3sec. We see then the following menu:

http://gallery.mikrokopter.de/main.php?g2_view=core.DownloadItem&g2_itemId=92854&g2_serialNumber=2

Now select SETTING & DATA VIEW and change to RX CURVE.
There you change 5CH FUNCTION into SENSOR:

http://mikrocontroller.com/files/HoTT/CH5Sensor.jpg

Receiver GR-16

The GR-16 HoTT is an 8-channel receiver, which you can upgrade to 16 channels via sumsignal (depends on transmitter).
The range is with this receiver according Graupner 4000mtr.

Output for the sum-signal

http://mikrocontroller.com/files/HoTT/GR16_a.gif

  • "sum-signal" must be activated (see: "Binding").
  • The receiver has to be bound to the transmitter (see: "Set the receiver to sum-signal").
  • The sum-signal is on output 8.

Telemetry

The receiver has a separate data channel at the other side for the MikroKopter telemetry:

http://mikrocontroller.com/files/HoTT/GR16_b.gif

Receiver GR-24

The GR-24 HoTT is an 12-channel receiver, which you can upgrade to 16 channels via sumsignal (depends on transmitter).
The range is with this receiver according Graupner 4000mtr.

Output for the sum-signal

http://gallery.mikrokopter.de/main.php?g2_view=core.DownloadItem&g2_itemId=93859&g2_serialNumber=2

  • "sum-signal" must be activated (see: "Binding").
  • The receiver has to be bound to the transmitter (see: "Set the receiver to sum-signal").
  • The sum-signal is on output 8.

Telemetry

The receiver has a separate data channel at the other side for the MikroKopter telemetry:

http://gallery.mikrokopter.de/main.php?g2_view=core.DownloadItem&g2_itemId=93854&g2_serialNumber=2

Operating Note: Receiver Placement

Operating Note: The receiver aerials must be arranged at least 5 cm away from all large metal parts and leads which are not attached or connected directly to the receiver. This includes steel and carbon fi bre components, servos, fuel pumps, cables of all sorts, etc. Ideally the receiver should be installed in an easily accessible position in the model, away from all other installed components. Under no circumstances run servo leads immediately adjacent to the receiver aerials, far less coil
them round it!
Tests have shown that a vertical (upright) position of a single aerial produces the best results when long approaches are flown with a model. If the receiver features a diversity aerial system (two aerials), the second aerial should be deployed at an angle of 90° to the first.

Connection of the receiver to the FlightCtrl2.1

The receiver is connected with a PPM-cable and a second cable for the telemetry to the FlightCtrl:

  • PPM-cable - Black on "GND" (ground)
  • PPM-cable - Red on "+5" (Plus)
  • PPM-cable - Orange on "PPM" (PPM-datawire)
  • Jumper "JETI" has to be bridged.
  • Solder the data-wire (for the HoTT-reversed channel) at "RX". Connect this cable to the sensor connector labeled "T" of the HoTT receiver.

http://gallery.mikrokopter.de/main.php/v/tech/FC21_Jeti_1.jpg.html

As receiver choose "Graupner HoTT" in the KopterTool:

http://mikrocontroller.com/files/pictures/EasyCfg_channel.gif

Voice-output

For the voice-output you can plug a customary earphone into the MX-20 HoTT.

With the voice-output the MikroKopter can "tell" its values to the pilot. It simulates the various sensors of the HoTT-System

The output can be retrieved via a switch on the transmitter.

In addition there is:

  • Vario-tone -> indicates elevation as tone

  • Alerts. "Low voltage" e.g.

Select a sensor

Currently you can select just one of four (simulated) sensors.

http://mikrocontroller.com/files/HoTT/voice4.jpg

Outputs of the Sensors 'General Module'

The sensor "General module" currently shows the most data - therefore it is recommended that you choose this one.

To set the following values, you have to get back to the window "telemetry" and select the entry "VOICE TRIGGER" at the bottom.
Select it with "SET".
In the window "VOICE TRIGGER" change to "SENSOR" and confirm with "SET".
Now the window with the sensor is open. If you scroll down, the lower display appears.

If you select this menu ("General module"), you can let announce following values:

http://mikrocontroller.com/files/HoTT/general_voice_select.jpg

  • Lipo-Voltage
  • Temperature of the warmest Brushless-Ctrl
  • Temperature of the coldest Brushless-Ctrl
  • Height
  • Direction
  • Speed
  • Consumed Lipo-capacity
  • Elevation

Summarized values

http://mikrocontroller.com/files/HoTT/general_telemetry_1.jpg

http://mikrocontroller.com/files/HoTT/general_telemetry_2.jpg

  • Current LiPo voltage
  • Signal-strength
  • T1: temperature of the coldest Brushless-Ctrl
  • T2: temperature of the warmest Brushless-Ctrl
  • Kompass-direction (2.66 -> 266 degrees)
  • Distance to the starting point
  • Lipo-voltage
  • Height
  • Elevation
  • Current
  • Consumed capacity in mAh
  • Home-direction(2.66 -> 266 degrees)

Display voltage and temperature

http://mikrocontroller.com/files/HoTT/general_temperature2.jpg

There are two menus.

  • Temperature 1: Temperature of the coldest Brushless-Ctrl
  • Temperature 2: Temperature of the warmest Brushless-Ctrl

Display of the capacity and height

http://mikrocontroller.com/files/HoTT/battery.jpg

  • Voltage
  • Current
  • Consumed mAh
  • Height in meters (the displayed unit 'ml' is wrong)

Display of the height

http://mikrocontroller.com/files/HoTT/telemetry_altitude.jpg

  • Height
  • Elevation

Display of the distance

http://mikrocontroller.com/files/HoTT/general_rpm.jpg

The GPS-distance to the starting point will be displayed. The unit 'RMP' is wrong.

The small number beside the bar shows the max. distance.

Outputs of the Sensor 'Electric Air Module'

If you select this sensormodule, following values will be announced:

http://mikrocontroller.com/files/HoTT/electric_voice_select.jpg

  • Lipo-voltage
  • Temperature of the warmest Brushless-Ctrl
  • Temperature of the coldest Brushless-Ctrl
  • Height
  • Direction
  • Speed
  • consumed Lipo-capacity
  • Elevation

Summarized values

http://mikrocontroller.com/files/HoTT/air_telemetry1.jpg

  1. Lipo-voltage
  2. Current
  3. Consumed capacity in mAh
  4. Kompass-direction (2.70 -> 270 degrees)

  5. Elevation
  6. Signal-strength
  7. T1: Temperature of the coldest Brushless-Ctrl
  8. T2: Temperature of the warmest Brushless-Ctrl
  9. Height

Display of the height

http://mikrocontroller.com/files/HoTT/telemetry_altitude.jpg

  • Height
  • Elevation

Display of the Battery

http://mikrocontroller.com/files/HoTT/battery_air.jpg

  • Voltage
  • Current
  • Consumed mAh

Output of the sensor 'Vario Module'

If you select this sensormodule, following values will be announced:

http://mikrocontroller.com/files/HoTT/vario_voice_select.jpg

http://mikrocontroller.com/files/HoTT/telemetry_altitude.jpg

  • Height
  • Elevation

Output of the module 'GPS'

If you select this sensormodule, following values will be announced:

http://mikrocontroller.com/files/HoTT/voice9.jpg

  • Distance to the starting point
  • Height
  • Direction
  • Speed

Display of the height

http://mikrocontroller.com/files/HoTT/telemetry_altitude.jpg

  • Height
  • Elevation

Summarized values

http://mikrocontroller.com/files/HoTT/gps_telemetry.jpg

Adjustment of the spoken values

At the transmitter you can select, what has to be announced. By default it would be spoken too many values, therefore we have to disable most of them:

Sensor Select

The FlightCtrl can 'simulate' different sensors.

  • Hold down ESC for about 2 seconds at the transmitter -> then you get into the menu "Telemetry"
  • Select "Sensor Select"
  • Select desired sensor "General Module" e.g.

http://mikrocontroller.com/files/HoTT/ESC.gif http://mikrocontroller.com/files/HoTT/voice0.jpg http://mikrocontroller.com/files/HoTT/voice4.jpg

Voice Trigger and Vario-tone

  • Select Voice Trigger
  • Select the menu "TRIG"
  • Use desired switch at the transmitter(upper left e.g.)

http://mikrocontroller.com/files/HoTT/ESC.gif http://mikrocontroller.com/files/HoTT/voice1.jpg http://mikrocontroller.com/files/HoTT/voice2.jpg http://mikrocontroller.com/files/HoTT/voice3.jpg


Assign a switch for the vario-tone:

http://mikrocontroller.com/files/HoTT/vario_switch.jpg http://mikrocontroller.com/files/HoTT/voice3.jpg

If this switch is 'ON', the elevation of the vario-height-regulator will be emitted as tone.

  • Tip: If you want the variotone just for the vario-height-regulator, then assign the switch for the variotone to the switch of the height-regulator.


  • Switch to the menu "Transfer"
  • Disable all announcements

http://mikrocontroller.com/files/HoTT/voice5.jpg http://mikrocontroller.com/files/HoTT/voice6.jpg


  • Switch to the menu "Receiver"
  • Disable all announcements

http://mikrocontroller.com/files/HoTT/voice7.jpg http://mikrocontroller.com/files/HoTT/voice8.jpg


  • Switch to the menu "Sensor"
  • Select the desired announcements

http://mikrocontroller.com/files/HoTT/voice9.jpg http://mikrocontroller.com/files/HoTT/voice10.jpg

(Depending on the sensor you have set, you can enable/disable the announcements)

Recall of the spoken values and Bugfix

If you press the corresponding button for the voice-output (like described above), the selected values will be spoken.

Unfortunately the MX-20 transmitter don't retrieve the speech-values of the MikroKopter, when the text-telemetry-display is displayed. Graupner have to change this. This is no problem of the MikroKopter-tool.

If the speech has to be transmitted, leave the text-telemetry with ESC.

http://mikrocontroller.com/files/HoTT/Voice_ESC.jpg

Now you can let announce the values by pushing the button.


If you want to see the text-telemerty, you have to confirm with "SET", to switch to the receiver display.

http://mikrocontroller.com/files/HoTT/Voice_SET.jpg

/!\ Attention: If you are in the text-telemetry, no values will be announced.

{i} One exception is the "Low-voltage-warning": The voice-output "low-voltage" appears in every menu.

Text-telemetry

http://mikrocontroller.com/files/HoTT/ESC.gif

  • The MikroKopter has to be turned on, the receiver has to be bound and the Type has to be "Graupner HoTT" in the MikroKopter settings
  • Press ESC for about 2 seconds on the transmitter -> you'll get into the menu "Telemetry"
  • Select "SETTING & DATA VIEW" (down and SET)
  • You get into a menu, which ist generated by the receiver
  • Press "UP" once

http://mikrocontroller.com/files/HoTT/goto_telemetry.jpg

Alternative:

  • Switch to the MK-telemetry by pressing right (6 times)
  • If the menu stays on "Servo Test" and no further arrow to the right is displayed, then the receiver don't get telemetry data from the FlightCtrl
  • You can't switch back to the receiver menus. Right/Left are switching to the MK-menus

http://mikrocontroller.com/files/HoTT/pfeil.gif

MK-Menus

Settings Overview

Here you can get a quick overview of the used setting

http://mikrocontroller.com/files/HoTT/HoTT_Setting_2.gif

{i} If Looping or Heading-Hold is activated there will be a warnung at the bottom

Status

http://mikrocontroller.com/files/HoTT/text_telemetry.jpg

GPS-Mode symbol

A symbol shows the actual GPS-Mode:

  • - : no GPS possible
  • / : Free
  • W : Waypoint
  • H : Coming Home
  • D : Dynamic Position Hold
  • P : Position Hold

Vario - symbol

This shows the setpoint of the altitude control. (vario mode only)

  • = : no change in altitude
  • + : increase altitude
  • - : decrease altitude
  • ^ : increase (command from NC: (Waypoint))
  • v : decrease (command from NC: (Waypoint))

The background of the symbol is black, if the altitude control is activated.

Status temperatures

http://mikrocontroller.com/files/HoTT/Hott_Status_2.gif

Errormessages in plain text

In the case of an error, you hear a warning and a text will be displayed:

http://mikrocontroller.com/files/HoTT/ERR_H1.gif

http://mikrocontroller.com/files/HoTT/ERR_H2.gif

See also: ErrorCodes
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