I ordered this Atmega32u4 board while forgetting that the 32u4 has dedicated SPI pins, which this board didn't break out to a header.
And of course its the QFN version. But with the help of a head magnifier, some disassembled stranded wire, and by channeling my inner Louis Rossman, I managed to get wires onto the MOSI, MISO, and SCK pins.
Attached are some pictures so you can laugh at my suffering. I am going to finish the code soon and see if it works.
PS: For the curious among you, this is for a custom design I did based on the Si4463 radio transceiver from Silicon Labs, which i'm configuring for use in the 2 meter ham radio band.
Believe it or not, you can do that with 30AWG kynar wire with the insulation still on. I have use smaller wires, but there is rare the job that actually need it. 30AWG kynar is my bread and butter. I feel naked without at least 1000 feet on hand.
If you really need to use bare/bus wire, here's a tip. Hot glue a little bit of board to the top of the chip. Either a tiny fragment of protoboard or a little square of copper clad scored into 3 little strips. Using a small knife, you can cut these 3 traces partway through to reduce heat transfer. Then connect the little bus wires to one side of the board, and connect insulated wires to the other. Tack the insulated wires down to the pcb just a little bit away, for strain relief. If room allows, I like to make the board large enough to place a small paper label on it to identify each signal without looking at a datasheet. And it allow easy resoldering if the interconnect wires do break.
Maybe overkill for this specific project. But a lot of my proto/dev boards may get cleared/stored away and revisited several times, and going the extra mile saves time and effort in the long run. But your lack of even hot glue is disturbing. When doing anything like this... hot glue, baby.