ArduPilot Mega APM 2.8 flight controller (straight/curved needle) with built-in compass, suitable for quadcopters

APM V2.8.0 Instructions with compass: -This version cancels the 1.0mm 6P SM06B GPS interface of the old version V2.52 and replaces it with the DF13-4P I2C external compass interface. -Connect the DF13-5P GPS interface to the outer compass interface to facilitate the connection between GPS and the outer compass. -V2.52 I2C interface changed to multifunctional MUX interface -The modified version has added an isolation resistor, which effectively avoids the interface when the OSD interface is used together with telemetry -The V2.52 version 3.5V power supply adopts IPS79133, with 6V withstand voltage and output current of 100mA. It needs to supply power to six ICs, but the power supply capacity is slightly insufficient and prone to burnout. The new version adopts the American LP2985-3.3, 16V withstand voltage, which is more reliable and eliminates the possibility of poor gyroscope health   APM V2.8.0 Flight Controller -Needle: straight/curved -Power supply: LP2985-3.3 -Maximum voltage: 16V