![]() ![]() It expects to have code that is compiled for another bootloader, instead of using the 8MHz frequency with the oscillator. If you upload the wrong frequency, the IC will not be able to understand any new code that is being uploaded. Wrong Bootloader It's possible to brick your Pro Micro 3.3V/8MHz if you used the wrong board selection with the wrong frequency. I recommend trying a different method than using the interrupt timers. I am unsure of how to fix this issue if you continue to use code that interferes with the CDC. Interrupts Atmega32u4's built in CDC driver for USB communication can have timing issues when messing with the watchdog timer, sleep modes, and timer interrupts. Timing Issues w/ USB Communication through CDC ![]() Note: See the GitHub link below for support with the Arduino IDE. Not sure which Arduino or Arduino-compatible board is right for you? Check out our Arduino Buying Guide! If you're supplying unregulated power to the board, be sure to connect to the "RAW" pin on not VCC. There is a voltage regulator on board so it can accept voltage up to 12VDC. The lower system voltage also has its advantages, though, like ease of use with many common 3.3V sensors. This is the 3.3V version so, as always, keep in mind the limits of system voltage and so forth. ![]() Running at 8MHz and 3.3V, this board will remind you a lot of your other favorite Arduino-compatible boards but this little guy can go just about anywhere. This tiny little board does all of the neat-o Arduino tricks that you're familiar with: 9 channels of 10-bit ADC, 5 PWM pins, 12 DIOs as well as hardware serial connections Rx and Tx. The USB transceiver inside the 32U4 allows us to add USB connectivity on-board and do away with bulky external USB interface. That's why we're adding to our line-up of Arduino-compatible microcontrollers once more! The Pro Micro is similar to the Pro Mini except with an ATmega32U4 on board. Here at SparkFun, we refuse to leave 'good enough' alone. ![]()
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