For something smaller and lower power consumption, you might check out the Arietta board: https://www.acmesystems.it/arietta https://www.acmesystems.it/arietta

For something smaller and lower power consumption, you might check out the Arietta board: https://www.acmesystems.it/arietta https://www.acmesystems.it/arietta It's about half the size of the Pi Zero, and can enter an ultra-low-power mode consuming only ~5 mA (and resume in 160 ms).