PCB Changes in next revision

[StefanRvO]

The PCBs has now been recieved (Though all IC's have not yet been recieved). This issue will be used to keep track of the changes needed for next revision. So far, the following issues/inconveniences have been identified:

Power Board:

• The milling on the leftmost socket should probably be improved so it does not look so strange..
• The pad for the center leg of the SRD-05V relay is too small, so it is quite hard to fit the relay in.
• The power supply should be moved ~ 1mm further away from the socket.
• Add a bit more spacing between the sockets.

Logic Board:

• The MOSFET's Q4, Q5, Q6 (Used for the LED's in the buttons) are located a bit close together, making them difficult to solder. Some more spacing should be added in the next revision.
• The footprint for the ADUM1410 digital isolators is a bit too slim. They are still solder able with the current footprint, but it would be easier to add a bit wider one. (Will Possibly cause issues with the PCB size, so we need to consider if it is really needed. After some current revision boards have been soldered, we will probably have a better idea.
• We should allow the ESP32 to be soldered onto the heat-sinking path underneath it, possibly by adding some large vias. However, this will result in that it will not be possible to have components on the opposite side of the pad, which will possibly cause issues.
• Generally, silkscreen placement should be improved(However, seeedstudio apparently does apparently add a random offset to the silkscreen layer when they print it, so it is quite hard to fix this.)
• The ESP32 have internal pullups for I2C, so we can remove R6 and R5

Both

• We should consider using the more common 5.08 mm terminals instead of 3.5 mm
• The footprint for the PCF8574 is a bit narrow.
• The polarity of the PLM-03 and PLM-05 power supply are reversed.
  -- Two possibilities of mounting the power supply on the current PCB exists:
  --- Mounting the power supply on the opposite side of the PCB will reverse the two pins. However, this will also increase the height of the device.
  --- Adding some kind of adapter to swap the two pins. An example of ho an adapter could be made can be seen below: