syma x5c-1 mainboard

찾아보니.. 6채널 PWM을 지원하는 MCU이니까

모터 하나당 1개의 PWM 채널로 DC 브러시모터를 제어하는 식으로

ESC없이 단순화 시킨 것으로 보인다.

The three main chips on the control board are:

Processor : NUVOTON MINI 54ZAN

Wireless : BEKEN BK2423

Stability : INVENSENSE MPU 6050C

[링크 : http://hackedgadgets.com/2014/11/27/syma-x5c-1-quadcopter-review-and-teardown/]

PWM  Independent 16-bit PWM duty control units with maximum six outputs  Supports group/synchronous/independent/ complementary modes  Supports One-shot or Auto-reload mode  Supports Edge-aligned and Center-aligned type  Programmable dead-zone insertion between complementary channels  Each output has independent polarity setting control  Hardware fault brake protections  Supports duty, period, and fault break interrupts  Supports duty/period trigger ADC conversion  Timer comparing matching event trigger PWM to do phase change  Supports comparator event trigger PWM to force PWM output low for current period  Provides interrupt accumulation function

[링크 : http://www.nuvoton.com/resource-files/DS_Mini51DE_Series_EN_Rev1.01.pdf]

무선은 2.4GHz대 GFSK 라는 방식을 쓴다는데

Gaussian Frequency Shift Keying 의 약자인데 먼지 감이 안오네

[링크 : http://www.rfwireless-world.com/Terminology/GFSK-vs-FSK.html]