Major new 2019 upgrades for S4.
- Major processor upgrade to the ARM Cortex M4 thru the Adafruit ItsyBitsy M4 Express.
- The new processor allows a major change in form factor to the PocketQube 1p - a 50% decrease in volume.
- The new processor allows a major change in form factor to PocketQube standard stacked 42mm square PCBs with a common bus for power and communications.
- Communications have been simplified to LoRa.
- Performance improved by ~4x.
- Mission memory simplified to totally solid state flash removing occasional memory loss due to flight stress on uSD cards in mechanical carriers. Major increase in reliability.
- New sensors for atmospheric aerosols spectroscopy, light spectroscopy, UV light, IR imaging.
- New I2C GPS with new altitude limit of ~80 km.