CHANGELOG.txt

v22
Switched to 4 layer layout
Added SPI header
Added optional I2C socket next to AMS-5915
Added 1000pF capacitors to GND on interface pins to improve RF immunity
I2C bus resistors changed to 6k8
All 100nF caps are now 0402, all 1uF caps are 0603, all 10uF caps are 0805. 470pF caps are 0805. 220nF are 1206. 47pF cap is 0402.  All resistors are 0402.
75k resistor was removed. AP65211AWU-7 should be replaced with AP62200TWU-7 or AP62300TWU-7.
The LDL212PV33R is replaced by a LDL212PVR (these are identical except that the LDL212PVR requires a pair of resistors.  The LDL212PV33R can still be used if you leave one of the resistors open and short the other.
Each NCV8163 is loaded with a Pi-filter (10uF cap, ferrite, 1uF cap).  Each MEMS sensor has a 100nF on VDD and a separate one on VDDIO.  There is a ferrite between each 100nF and the respective 1uF cap. 

v21
Added resistor divider to 12V input for battery voltage measurement on ESP32
Added bypass capacitor to V_SNS resistor
Extended UART1 connector with VCC pin for HC-05 compatibility
Modified audio amplifier input summing (resistor + cap on each input)
Added ferrites to USB power and GND rails
Added 1uF capacitor to VDD4F rail
Solder pad tweaks to improve manufacturability
Added Fiducials to improve manufacturability

v20
Extended UART0 connector with EN, GPIO0 pins
Moved ESP_AUD, WIFI_EN to different ESP32 pins

v19
Added bypass capacitor to ESP32 EN pin

v18
Initial upload