The schematic

The PCB

This PCB is meant to be a help to build the prototype on a perfboard, all with 2.54mm (100 mil, meaning 100 milli-inches) through-hole components, so I'm using a grid of that size, and allow some room between the components:

I print it on a A4 sheet of paper, which I'm then using as guide to place the components and wiring:

I don't build the whole thing at once:

• I first solder in place the big connectors:
  • The 2-poles and 3-poles terminal blocks
  • The ICD connector.
  • The radio control receiver connector.
• Then I place the microcontroller, using a DIP-28 socket.
• Then I wire the minimum to perform a hello world to the microcontroller

Connectors:

• The RC receiver is connected to the (C) module via a standard servo extension cable like this one: https://www.amazon.com/RCmall-Servo-Extension-Cable-Futaba/dp/B01MQPCLPT.
  • To plug the servo extension cable I'm going to use a Molex 3 poles, right angle header: https://ch.farnell.com/fr-CH/molex/90121-0763/connect-header-3-voies-1-rangee/dp/9733450
• To connect the 12V DC Motor I'm using the same 2 pole and 3 pole green connectors with screws: Connectors: Meccano builders seem to be fond of those green screw terminals. Their technical name is PCB terminal block, Wave soldering, Screw connection with tension sleeve:
  • 2 poles: https://ch.farnell.com/phoenix-contact/1729128/bornier-sur-ci-2v-5-08mm/dp/3041440
  • 3 poles: https://ch.farnell.com/camdenboss/ctbp0508-3/bornier-fil-a-carte-3-voies-16awg/dp/2