The USB-to-serial is now done with a reversible USB-C connector with through hole anchoring and the ubiquitous CH340G requiring fewer driver installs. We've also broken out the SDA, SCL and IOREF pins that showed up on the Arduino Uno R3 footprint. The SparkFun RedBoard Plus has all of the hardware peripherals you know and love: 22x Digital I/O pins with 6x PWM pins, 8x analog pins, UART, I2C, SPI, and external interrupts. The best part about the RedBoard Plus is that it utilizes SparkFuns handy Qwiic Connect System which means no soldering or shields are required to connect it to the rest of your system!
Two version of the Pro Mini:one runs at 3.The SparkFun RedBoard Plus is an Arduino-compatible development board that has everything you need in an Arduino Uno with many extra perks. Two version of the Pro Mini:one runs at 3.3V and 8 MHz, the other at 5V and 16 MHz. Allowing the use of various types of connectors or direct soldering of wires. Intended for semi-permanent installation in objects or exhibitions. A six pin header can be connected to an FTDI cable or Sparkfun breakout board to provide USB power and communication to the board. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, an on-board resonator, a reset button, and holes for mounting pin headers. The SainSmart Development Board For Arduino Pro Mini is a microcontroller board based on the ATmega328(datasheet).
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