doc: add v2 changes

CHANGELOG.md

@@ -1,3 +1,20 @@
+v2
+--
+
+fixes:
+
+- ESP antenna not surrounded by copper
+
+changes:
+
+- use larger barrier terminal for power ports to carry more current, clamp more wires, and allow wiring when the board is mounted in the enclosure
+- remove 5V jack to save space, and 5V power can be provided by USB port
+- add board hole to fit in other enclosure version
+- use ESP32-S2-MINI instead of WROOM to save space and avoid Not Recommended for New Design part
+- use top spring terminal for LED data wires so they can be inserted when the board is mounted in the enclosure
+- add status LED and change LED meanings
+- complete re-layout
+
 v1
 --
 
@@ -9,12 +26,10 @@ changes:
 
 - use screw terminal for power input/output to support more current
 - add power input protection: PPTC and reverse polarity
-- add switch configure DMX512 line termination
-- change DC-DC buck converter for large input voltage
+- add switch configure DMX512 line termination (loop back to D2 so the XLR chain can continue, end using a termination resistor, or continue forwarding to other port
+- change DC-DC buck converter to TPS54560 for large input voltage (e.g. 48V power supply and batteries)
 
-issues:
-
-- the case has actually other mounting holes, still
+issues: all the same as v0
 
 v0
 --
@@ -24,3 +39,6 @@ first prototype, with the bare features
 issues:
 
 - the case has actually other mounting holes
+- WiFi does not work because of missing [copper clearance around the antenna](https://espressif.com/sites/default/files/documentation/esp32-s2_hardware_design_guidelines_en.pdf).
+- KF141R footprint is not long enough (not really an issue)
+- LED cables need to be stripped ~ 10 mm to fit it KF141R (minor inconvenience)