BARO "ALT" READOUTStart with EdgeTX 2.7.1/OpenTX 2.3.15 and ExpressLRS 2.5, Baro Alt telemetry ID is supported in CRSF protocol.You need to update Transmitter, ExpressLRS TX module and Receiver all to latest verison.and update CRSF-PWM-V to V2.3.0 or newer. https://www.mateksys.com/?portfolio=crsf-pwm#tab-id-6
BOTTOM PCB VARIANTThere is another bottom CRSF-PWM PCB version in market. VBat pad is nearby CH “7”, CH”8″ is just a pad at bottom side. The silk print labelling are correct on both versions. Just follow the labelling to wire Vbat voltage and CH8 signal.