* on-board USB-based charger for single-cell LiPo battery
* low noise 5V switching regulator to power pressure sensor
* precision divider with 0.1% resistors to scale pressure sensor
* on-board USB-based charger for single-cell LiPo battery
* low noise 5V switching regulator to power pressure sensor
* precision divider with 0.1% resistors to scale pressure sensor