HW-V2.0.0-alpha

Finished PCB ready for production.

Improvements on PCB V2.0.0

• Shrinked general schematic and PCB layout (rearrangement of parts, space reduction of ~30%)
• Removed testpoints
• Added/Improved silkscreen labels
• Removed 2/3 IMUs because not needed anymore
• Removed UART access pins because communication runs fully over USB-C
• Replaced 1/4 button jack by push button to enter device config mode

Bugfixes

• Changed I2C-SDA pullup from 4k7 to 1k8 due to special timing requirements of BNO055 IMU

Known Bugs

• Battery charging status cannot be determined correctly due to week internal pullup of ESP32-S3. Can be patched by adding an additional 1k-Pullup to Vbat and deactivating the internal pullup.

v1.1.1-alpha

Added minor improvements to PCB V1.1.0

Improvements on PCB V1.1.1

• Improved general schematic and PCB layout (rearrangement of parts)
• Added/Improved silkscreen labels
• Removed unneccessary 25V specification from caps
• Changed R3/R4 from 10k to 100k (less power dissipation)
• Added i2c pull-ups
• Added connector for sip&puff sensor board

Bugfixes V1.1.0

• Fixed swapped battery input poles
• Added missing GND-connections to BNO055 IMU
• Fixed wrong pinning of AS3401 PMOS

Other Changes V1.1.0

• Added Testpoints
• Moved LEDs and power switch to pcb-edge

HW-V1.1.0

Added new feature to PCB V1.0.1

New Features

• Added connector for sip&puff sensor board

Bugfixes

• Fixed swapped battery input poles
• Added missing GND-connections to BNO055 IMU
• Fixed wrong pinning of AS3401 PMOS

Other Changes

• Added Testpoints
• Moved LEDs and power switch to pcb-edge

Hardware V1.0.1

Improved PCB V1.0.0

Bugfixes

• Fixed swapped battery input poles
• Added missing GND-connections to BNO055 IMU
• Fixed wrong pinning of AS3401 PMOS

Other Changes

• Added Testpoints
• Moved LEDs and power switch to pcb-edge