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Good 2018-01-10 00:13:29
I replaced the F1 Naze on my Eachine Racer 130 with this F4 Omnibus. The gyro sampling rate went from 1 khz to 8 khz, the OSD works well, and the CPU is only running at 4% load. There is a pull down resistor on the RC_IN (PPM input) connection on this FC (like most Omnibus F4 FCs). That pull down is enough to trigger a PPM receiver to go into BIND mode every time the FC is powered on. If you use a PPM receiver and want to avoid having to rebind your receiver every time you power on the FC, you will have to remap resources, which I did by swapping RC_IN with TX1. If you want to see the defaults before swapping, type 'resource' at the CLI command line and you should see that the defaults pin mappings include: resource PPM 1 B14 resource SERIAL_TX 1 A09 This means that RC_IN (PPM 1) is connected to the STMF4 pin B14, and serial TX1 is connected to the STMF4 pin A09. The TX1 connection does not have a pull down, so it can be used to receive PPM signals and not put the receiver in bind mode. Once you have your PPM Rx bound to your transmitter, connect the PPM signal line to the TX1 pin instead of the RC_IN pin, and swap the TX1 and PPM1 resources via these Betaflight CLI commands: resource PPM 1 A09 resource SERIAL_TX 1 B14 save
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