for low amp boards, 3mm holes to hold the MOSFETs in place has been added
at the DIP switch, holes have been added (for ease of adding external (miniature relay) control of a channel)
using 0805 size components (are easier to hand solder)
because the PCB has been re-sized, all copper paths were re-designed
added IDC 10-pin option (for easy connect/disconnect of RasPi control pins)
added extra pin rows so the dual rows of the “Wemos S2 mini” (ESP32 27-pin) controller connects to the board
added a 5V pin-connector at the bottom edge of the board
added a GND screw-terminal/connector at the bottom edge of the board
added solder stripes to the bottom layer - so additional copper strips can be soldered to the board (2x 64amp strips can be added)
additional power-in connectors/options (blade connectors and/or screw-held ring-eye-lets
added a DHT22 connection header (S2 mini option on pin D21)
on-board low-battery-voltage on/off switch - so a simple on/off signal can remove power from the MCU (and thus can turn the entire board OFF) - in low-battery-voltage situations
added a 100nF capacitor to the A0 analog input (might help stabilize the analog reading a little bit)