Thank you for your reply. I am using DIY board (arduino nano +servo board ) and using 24LC256 EEPROM. Battery is 2s lipo (350 25c) What do you mean flip? is it mean chnging negative to positive? Regards

Hello Finally I decided to attach I2C EEPROM(16kb) in order to break the limit of skills and also avoid mistake in the modification of code. In this case do I need to assign address for each I2C devices ( rom, gyro, servo driver)? Thanks in advance

Thank you very much. I already comment out #define I2CEEPROM in the instinctNybble.h Is it enough or need another modification to work internall EEPROM?

Thank you very much for your quick reply. I found that signal range of "bittel.h" is 0.8ms to 2.7ms. This caused some sevo to keep rotation, so that I noticed that bittel 's servo has enhanced working angle. Therefore I activated " nybble.h" then signal range was changed 0.8ms to 2.2ms . This value is acceptable for most RC servos. However I am still wonderling why outputs of servo driver are not middle ( arround 1.5ms) .