8x P-channel MOSFET - Wemos D1/S2 mini controlled - Versions C4

 Q: What is this board good for? 
 A: Automotive use - as this board turns power on/off on the plus wire

The C4 versions are contained within a 100x100mm envelope - including corner mounts, screw holes and PCB

GND is still a part of the corner mounts
it is still possible to manually activate a MOSFET channel using a DIP switch
it is still possible to use the “Wemos D1 mini” as the MCU controller (though a “Wemos S2 mini” is now optional)
it is still possible to use the very nice 45-degree-angled spring-loaded high-amp Molex connectors

Main changes

the size of the PCB is 100x83mm - and all screw holes are kept within that frame
each of the 8 channels now have a dual-MOSFET option
there are 2 versions of the C4 PCB.
- C4 maintains all the basic functions of the 'Original' C3
- C4-F have on-board fuse holders - one for each of the 8 channels
12V → 5V conversion is now done (only) via a switch-mode DC-DC converter module

Minor changes and added options

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)

specific for the C4 board:

specific for the C4-F board:

Projects