How to use your transmitter with FMS flight simulator

The simulator is useful for testing the ArduinoRC software.
You just need to add a PPM output socket, make a simple cable and install some Windows software.

1. Add a PPM output jack

• Mount a 3.5 mm mono female jack socket in the Tx; use a 3-connectors switched socket, the switch will be used to turn off the RF module when using the simulator
• Disconnect the RF module's GND wire from the Tx GND
• Connect the RF module's GND wire to the socket's switched GDN connector
• Connect the socket's common GND connector to the Tx GND
• Connect the socket's inner connector to D10 through a 1000Ω resistor; the resistor will protect D10 in case of an accidental short circuit to GND.

2. Make a cable

• The PPM signal is fed into the PC audio input (microphone socket)
• Use two 3.5 mm mono male jacks and a suitable length of shielded audio wire to make the cable; make the cable as short as possible.
• Connect the jacks' inner connectors with the signal wire of the cable through a 33kΩ resistor; the resistor will protect the PC's audio input; use a small resistor that can fit inside a male jack plug.
• Connect the jacks' outer connectors with the shield wire of the cable
• Test the cable:
  • connect the Tx to the microphone input of your PC with the cable;
  • set the microphone input volume to 50% in the Control Panel of Windows;
  • display to the PPM signal with Audacity or any other audio application;
  • use the graph to adjust the microphone input volume to minimize distorsion and maximize modulation.
  
  The 6 channels pulses repeat every 20 milliseconds on this Audacity graph

3. Setup the software

• Download and install FMS 2 alpha 85 (google fms2alpha85.exe). For Windows 7 and above: download and install d3drm.dll and fms-ecomport-fix.reg (google these files), and modify the FMS shortcut to enforce Windows-XP SP3 compatibility.
• Download SmartPropoPlus from http://www.smartpropoplus.com/
• Install and configure SmartPropoPlus for FMS
• Optionally, define ad hoc flight sim model(s) in your transmitter.

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