![]() The difference between the two is the bootloader type. Since the board uses an ATMEGA32U4, I tried the same code on a bare MCU and the code works as expected. I have pullup resistors on both wires, 2k each. To test it, I use the code below and the result is an infinite square wave on SCL and SDA lines and I only get the number 1 on the terminal output. If you have any questions or concerns on licensing, please contact technical support on our SparkFun forums.I have an Arduino Pro Micro(blue version) and I'm having trouble using the I2C. Please review the LICENSE.md file for license information. DEV-15795- 5V/16MHz version with Qwiic connector and USB C. ![]() SparkFun Fritzing repo - Fritzing diagrams for SparkFun products.SparkFun Graphical Datasheets - Graphical datasheets for various SparkFun products.SparkFun Arduino Board Addon - Arduino board addon for Qwiic Pro Micro.Qwiic Pro Micro USB-C - Basic hookup guide for the Qwiic Pro Micro.Pro Micro & Fio V3 - Basic hookup guide for the Pro Micro (ATmega32U4) 3.3V and 5V versions as well as the Fio V3./Production - Test bed files and production panel files./Hardware - All Eagle design files (.brd./Firmware - Arduino example code used in the hookup guide./Documentation - Data sheets (.pdf and.The USB connector and voltage regulator are also different. For users using the Qwiic Pro Micro USB-C, the board includes a jumper to select either 5V or 3.3V, reset button, castellated pads, and Qwiic connector. The Pro Micro comes in both a 3.3V and 5V version. The USB transceiver is inside the 32U4, adding USB connectivity on-board without external USB interfaces. The Pro Micro is a microcontroller with an ATMega32U4 IC on board.
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