MX-20 Flight Timer and Logging – Gary Haynes – Ver 1 Feb. 2, 2013 The Graupner series of flight transmitters have the ability to log flight data to a removable micro SD card. This ability does not work unless you have setup the Flight Timer function since the trigger to start a flight log is the Flight Timer. I am going to explain how both timers can be used, one the Stop Watch counting down from a set time with alarms and the Flight Timer which counts up. Important Note: You must have one timer that is setup as a Flight Timer in order to trigger the logging function on the Graupner. Here are the steps to setup the Flight Timers. Step 1 There are actually two timers. From the MX-20 photo below you can see them in the upper right side of the data window. There is a Stop Watch timer in the top and a Flight timer in the bottom. The starting of both of these can be controlled by the position of the Throttle stick. The Stop timer will run when the throttle is above a set value. Mine is set for -83%. As long as the throttle is above that level that Stop timer will run. If it is pulled back to zero then it stops. It can keep time counting up or be a countdown timer. Typically it is in a countdown mode and will give audible/voice warning messages as it approaches the time running out. For the Flight Timer, once it starts it continues to run until it is either manually reset or the transmitter is powered off. Step 2 To setup the timers go to the menu and scroll down to Timers (general). Step 3 You will see this screen. Scroll to the “Top:” line and click on the left field. There are 4 choices (Stop, Flight Timer, Time Frame, Motor) selected with the left-right arrows on the ring control. Select Stop for Stopwatch. Step 4 Now use the Right arrow and enter the amount of countdown time. Enter minutes first and then any seconds using the Set button and up/down arrows. In this example the Top timer will start at 8 mins and countdown. Once it hits Zero time it will continue but count upwards. Click on the right arrow and you will go to the next screen. Step 5 Set the warning signal time. The first entry (30s) tells the count down timer when to begin giving warning messages and count down beep tones. Enter what you would like for a warning time. Step 6 Lastly we need to tell the MX-20 how to start the timers. Click SET on the cell and then move the Throttle from zero so some higher point. Press SET again and you will see another screen. Click on C1 with the SET button. Step 7 Finally we will adjust the timer start point. From the main menu scroll up to the Control Switch item and press the SET button. Right arrow to the % column for C1 and press the SET button. Move the Throttle up slightly from the Zero position and click the SET button. I target about -85%. If you find that your first attempt is higher or lower than that value simply reposition the throttle and press SET again. Step 8 Do the same Throttle assignment for the Flight timer. Step 9 The last step is to set the date and time in the Info Display menu. While you will get log files without setting the date/time they are much easier to find if they are time stamped. You are done. Let’s check to see if it works. Exit the menus. If the timers are not displayed with your countdown number on the top and 0:00 on the bottom then we can reset them. With the Throttle at Zero, press the ESC key to stop the Flight Timer and then on the right hand ring press the up and down arrows at the same time to reset the both of the timers. Then advance the throttle and as it passes your start setting point both counters will start. If you throttle back to Zero the countdown timer will stop while the flight timer will continue. Logs will be created on the Graupner SD card when the Flight Timer starts and there is data being received from the GR16/GR24. Now with the micro SD card in the Graupner card slot a new file folder will be created containing the logs for each flight. You can review them with the Graupner Studio or SD Log Converter software. Since this logs the MK output of GPS coordinates it can be a good safety feature in case of a lost copter. Full instructions can be reviewed in the Graupner manuals. For the MX-20 this starts on page 138. Additional Information: You can use only one timer, the Flight Timer and assign a time to it. When you do this it will act as the Flight Timer, triggering the log creation, and as a Countdown Timer which can have voice triggers the same as the Stop timer in the example above. But since you will always have the Top and Center timers displayed on the screen I’ve found it easier to set it up the way I have described. If you do a battery change, actually physically removing the battery rather than charging it in the transmitter, it is a good idea to check the date and time. There is a battery that is supposed to keep the time clock going but I have found occasionally that the clock has reset. Makes it much harder to find the correct log file if you need it.