I designed a PCB for a programming box (based on OlliW’s original schematic) for the Assan GA250 gyro flashed with OlliW’s custom firmware (see my original post about flashing your gyro here). The programming box hooks up to your gyro and enables you to tune the parameters on the field. The design is really simple, it basically has an ATMega8, four buttons, 16×2 HD44780 compatible LCD and some auxiliary stuff. The […]

The Assan GA250 is nifty little gyro for $9,99, unfortunately it is very hard (or impossible) to get it to hold the tail in aggressive maneuvers with the original firmware, it just does not have enough adjustments. Don’t worry, there is a solution; flash a custom firmware to your GA250! There are at least two custom firmwares for the GA250 that I know of, but this how-to will deal with […]

A perfect companion for your modded Turnigy 9X transmitter is the FrSky RC system with telemetry. FrSky system supports sending telemetry data back to the transmitter module from the actual model you are flying. By default the D8R-II plus receiver supports two ADC ports (A1 and A2) and a 9600bps serial connection (through which you can send pretty much anything). The A1 port is pre-configured to include a 1:4 voltage […]

I own a FlySky FS-TH9X RC-transmitter which is the same device as the Turnigy 9X (also sold as Eurgle and Imax). This transmitter has become very popular because it is really cheap (under $60!) compared to all of its features. The best feature is that you can flash a custom firmware making it even better! I recently flashed a custom firmware to my 9X and in this post I’ll document […]