F3F TIMER PROJECT by Jon Edison
Updated Mar 2025
MK IV Timer - Upgraded to SMD layout
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The Mk IV Timer is similar to the MK III, in that the Race Management Functions are carried out by an Android Phone or Tablet. The Timing as before is done by a dedicated Micro which manages the lap counts and timing functions.
The Timer design is based around the existing hardware that is proving so reliable, but now with an upgraded processor and a dedicated built-in USB port for direct communications to the Android Software. Charging of the Android is via this usb link.
The Android Software has been developed by Mark Treble. An explanation of the functions and operation can be found here . The new system has the ability to link with a bluetooth Wind Meter and speakers to give voice instructions, wind speeds and lap counts as the race progresses.
As before, on launch, the Android starts the Timer which begins the timing and lap counting functions. At the end of the race, the Timer sends the race time value to the Android via the USB port.
During the race, the Android is displaying the Lap count, elapsed time and an estimated final time for the selected Pilot. On receipt of the time from the Timer, the Android updates its displays, and saves the time to memory. After allowing the CD to make a note of this time, the Android moves on to the next pilot. Pilot Management and Results management features are also included in the Android Software
The Race results are stored in a txt file ready to be imported into an Excel Spreadsheet. The Simon Hall Spread Sheet was especially written to allow these timer systems to import their results directly, and calculate the results automatically. Latest spread sheet here
A description of the earlier MK I, MK II and MKIII timers can be found here
Android Phone |
Android Nexus 7 Tablet