Link quality sensor for Frsky on Arduino Nano based on RealTadango LQ sensor. Custom name 5105. SBUS out connected through inverter to RX0, S-port - to D3. Lost frame detection based on tringle wave generation on one or 2 channels. Failsafe duration is displayed on the same 5105 custom sensor every 10s for 1s in 1/10 of a second.

@define's : DISPLAYFS - maxim number of detected failsafes to display LOWCHAN - channel with triangle wave generation (one in 8ch mode, lower (1-8) channel in 16 channels mode. HIGHCHAN - upper channel (9-16) in 16 channels mode CH16 - enable 16 channnel mode

Triangle generation in OpenTX: L08 a<x 0 Mix: CH8 L08 Weight(+100) Delay (u1:d1) Slow (u2:d2:)