A 9X RC transmitter controller based on the Gruvin9X 4.2 design using an ATMEGA2560 MCU. This is a 4 layer ultra compact design to be retrofitted into almost any reasonably sized non-Turnigy/FlySky case. All 4 layers have copper planes for voltages and ground including a portion for Analog Ground. Extensive 0805 SMD components are used on both sides along with other SMD transistors and ICs. The slightly larger 0805 parts are easier to solder for most people than the 0603 parts on the original Gruvin board, but since parts are installed on both sides this will be a tedious board to build.

It is designed to use the 26 pin East Rising 2.9" 128x64 back lighted LCD display as is common on ebay and is set up to use a cheap, simple ebay sourced Micro SD card with built in LDO and level shifter to interface between the MCU and the SD card. An original Turnigy 30 pin LCD should be able to be used if several unused pins are trimmed off the connector end of the flat cable. You can figure out which to trim if you are willing to undertake this project.

Some liberty is taken from the original Gruvin9X design since there is no support for a charger, a trainer port, or EL Back Light. The power on soft high side switch is simplified by using an integrated switch device. Control signals from the MCU that supported some of these eliminated functions are taken to test points and can be rewired easily if these functions are needed or can be used for other controls. There are stouter LDOs for 5V Vcc and the Haptic Motor and the 3.3V supply that is on an externally available AUX connector is capable of at least two hundred mA. The 5V Vcc LDO is also capable of several hundred mA for external use as well. All connectors are numbered the same as the Gruvin design (also the Turnigy numbered-I think).

Mounting holes are provided but are not matched to any particular TX case–a perf board mounting the front panel switches would be used as the mounting board for this controller and would need to be matched to the case.

This board has not yet been tested but has been thoroughly checked against the public domain Gruvin9X schematics. Given that it has extensive copper planes, signal integrity, especially in the analog portion, should be excellent, with little crosstalk.

If interested in building this I will update the silkscreen for added detail on the board, and I can supply .pdf schematics, excel BOM information and gerber files. Please contact me at larry dot shorthill at gmail for added info.