After this tedious step, he designed a PCB that hosts an Arduino Nano to accept input, two MCP23017 GPIO expanders to give it enough outputs, and CD4066BE CMOS switches to trigger the connections.

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One day they may be able to guide the nanobots through the body and control their functions, he said. "That kind of device simply did not exist; this is the first time we have created a nano-brain," ...

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An example of modifying flash memory on the Arduino Nano BLE Sense 33 from a sketch, using Mbed. - petewarden/arduino_nano_ble_write_flash ...