I wanted to use my bike's power meter as a presence detector, so I went down the rabbit hole of bluetooth advertisement sniffing and ended up creating a full integration.
Unfortunately the pedals go into sleep mode pretty aggressively so I only get Bluetooth updates when I physically wake them up (beginning or ending a ride, and attaching the charger) so they're not great for presence detection, but I can still trigger notifications if the battery is low after a ride. It makes me irrationally happy to see my bike in HA.