Can't find Arduino Driver


I have a Sparkfun RedBoard (arduino Uno).

I am able to upload code to my Uno using the IDE but I cannot see anything in the serial monitor

I cannot see any drivers in device manager called Arduino under 'Ports (COM & LPT)' or 'Unknown Devices'.

When I unplug and plug the USB cable to my Uno 'USB serial Port (COM4)' appears under 'Ports (COM & LPT)' .

Does anybody have any advice?

Thanks :slight_smile:

If COM4 appears when connecting and you can upload, you do not have a problem with drivers

The RedBoard uses a FTDI USB-to-TTL converter and the driver is by default installed with the IDE.

Please show your sketch; just in case, please read and pay special attention to point #7 about using code tags.

Hi, here is my code:

  MAX30105 Breakout: Output all the raw Red/IR/Green readings
  By: Nathan Seidle @ SparkFun Electronics
  Date: October 2nd, 2016

  Outputs all Red/IR/Green values.

  Hardware Connections (Breakoutboard to Arduino):
  -5V = 5V (3.3V is allowed)
  -GND = GND
  -SDA = A4 (or SDA)
  -SCL = A5 (or SCL)
  -INT = Not connected

  The MAX30105 Breakout can handle 5V or 3.3V I2C logic. We recommend powering the board with 5V
  but it will also run at 3.3V.

  This code is released under the [MIT License](

#include <Wire.h>
#include "MAX30105.h"

MAX30105 particleSensor;

#define debug Serial //Uncomment this line if you're using an Uno or ESP
//#define debug SerialUSB //Uncomment this line if you're using a SAMD21

void setup()
  debug.println("MAX30105 Basic Readings Example");

  // Initialize sensor
  if (particleSensor.begin() == false)
    debug.println("MAX30105 was not found. Please check wiring/power. ");
    while (1);

  particleSensor.setup(); //Configure sensor. Use 6.4mA for LED drive

void loop()
  debug.print(" R[");
  debug.print("] IR[");
  debug.print("] G[");



I can successfully upload the code to the Uno.
When I open the Serial Monitor I get the message:
MAX30105 Basic Readings Example
MAX30105 was not found. Please check wiring/power.

I know the MAX30105 is powered as I can use Matlab to read the voltage from A4 and A5.

I know the MAX30105 is powered as I can use Matlab to read the voltage from A4 and A5.

What is the use of reading A4 and A5 in matlab? And what are the readings that you get?

MAX30105 was not found. Please check wiring/power.

You will have to check your wiring; you might have a bad contact or a broken cable (between MAX and RedBoard). Or maybe swapped SDA and SCL by accident.

Anything else connected to A4/A5 or SDA/SCL?

The issue was my breadboard.

When I removed the breadboard and connected the Uno directly to the MAX30105 it worked!

Thanks! :slight_smile: