To program the Circuit Playground Express, you'll need to solder directly to the SWCLK and SWDIO pads on the back of the board.
After soldering, use a piece of tape or a dab of hot glue to hold the wires in place so they don't rip off of the pads. |
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Then, make the following connections between the Circuit Playground Express M0 and the SWD breakout:
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You can use breadboard-friendly Alligator clips to attach the Circuit Playground Express VOut and GND pins to the breakout.