APM2.9 APM2.8 flight controller board Support PPM apm2.6 2.8 upgraded

Note:Now the latest Mission planner 1.3.76 has bug ,it can not calibrate Accel for APM,Waiting for the official fix of this bug, please use version 1.3.74.

https://firmware.ap.ardupilot.org/Tools/MissionPlanner/archive/MissionPlanner-1.3.74.msi

APM2.9 is used in the same way as APM2.6, 2.8. The benefit is that APM 2.9 supports PPM or PWM receiver protocols.

Why use the PPM protocol? The communication speed is fast, the wiring is simple, only one line is needed, unlike each channel of the PWM, the PWM communication speed is slower than PPM/SBUS.

The product supports the PPM receiver protocol and supports the PWM protocol. Before using this product, make sure your receiver is PPM-enabled. If your receiver does not support PPM, use the PWM protocol.

Also, you can upload firmware from Mission Planner.Uploading firmware does not affect support for PPM.

When connect INPUT 2 and 3（Insert Jumper）,use PPM.

when Disconnect INPUT 2 and 3(Remove Jumper) ,use PWM

NOTE:The hardware of APM2.9 is same as APM2.8. Apm2.9 uses the PCB hardware of apm2.8. It's just that the code of the 32u2 chip is different.The 32u2 chip of apm2.9 supports PPM and PWM functions.

packageA included:

1x APM2.9 flight controller board with shell(without internal compass)

1x M8N GPS Moudule with shell(with external compass)

1x Shock absorber

1x GPS stand

1x RC receiver cable

1x PWMRC Receiver Connection Line

1x PPMRC Receiver Connection Line

packageB included:

1x APM2.9 flight controller board with shell(without Built-in compass )

1x M8N GPS Moudule with shell(with external compass)

1x Shock absorber