Changelog

v6 - (October 2021)

Changed:

• Formfactor to standard Feather size
• Replaced temperature/humidity sensor with SHTC3
• Replaced TVOC sensor with SGP40
• Changed MCP1640 package to DSON from SOT23-5
• Hatched ground planes on both top and bottom
• Re-designed sensor placement
• Thermal isolation slots for SHTC3
• Pinout for PM2.5 connector reverted back to original design (allows for bidirectional use of cable)

Added:

• Added I2C power control to D4
• Added battery backpack (CR2 holder)

v4

• Relocated the Si7021 to a separate "lily pad" for heat isolation

v3

• Fixed bug related supply voltage not being stable to the HPMTA115S0
• Relocated D7 to D5 for CCS811 reset signal
• Changed connector pinout. That way the cable does't have to be twisted.

v2

• Added ferrite to shunt noise
• Swapped out MCP1624 with MCP1640