Issue with NHD-C0220BiZ-FSW-FBW-3V3M Display Communication and Hardware Setup

pavan

Hello,
I am currently working with the NHD-C0220BiZ-FSW-FBW-3V3M display for a project but am encountering difficulties scanning for the I2C address. Below are the hardware connections I have used:

  1. RST: 3.3V with a 4.7K pull-up resistor
  2. SCL: 3.3V with a 10K pull-up resistor
  3. SDA: 3.3V with a 10K pull-up resistor
  4. VSS: Connected to GND
  5. VDD: 3.3V
  6. VOUT: 1.34V with a 1μF electrolytic capacitor
  7. C1+: 1.34V with a 1μF electrolytic capacitor connected to C1-
  8. C1-: 1.34V with a 1μF electrolytic capacitor connected to C1+

I would greatly appreciate any advice or insights on how to resolve this issue.

Thank you.

0

Comments

3 comments

Date Votes
  • Engineering Support
    Community moderator

    Hi Pavan,

    The I2C address can be scanned using an Arduino Uno with the code below.  This program scans for the device's 7-bit address.  This display specifies its address as an 8-bit write address of 0x78.  This corresponds to a 7-bit address of 0x3C.  You should be able to get the output below on the Arduino IDE serial monitor.

    Please follow the wiring below:

    Display              Arduino

    1                        3.3V

    2                        A4

    3                        A5

    4                       GND

    5                       3.3V

    6                       1uF cap to VDD

    7                       1uF cap to display pin 8

    8                       1uF cap to display pin 7

     

    Please also note that pin 1 is on the right side of the display.

     

    #include <Wire.h>

    void setup()
    {
      Wire.begin();
      Serial.begin(9600);
      while (!Serial);             // Leonardo: wait for serial monitor
      Serial.println("\nI2C Scanner");
    }

    void loop()
    {
      byte error, address;
      int nDevices;
      Serial.println("Scanning...");
      nDevices = 0;
      for(address = 1; address < 127; address++ )
      {
        // The i2c_scanner uses the return value of
        // the Write.endTransmisstion to see if
        // a device did acknowledge to the address.
        Wire.beginTransmission(address);
        error = Wire.endTransmission();

        if (error == 0)
        {
          Serial.print("I2C device found at address 0x");
          if (address<16)
            Serial.print("0");
          Serial.print(address,HEX);
          Serial.println("  !");

          nDevices++;
        }
        else if (error==4)
        {
          Serial.print("Unknown error at address 0x");
          if (address<16)
            Serial.print("0");
          Serial.println(address,HEX);
        }    
      }
      if (nDevices == 0)
        Serial.println("No I2C devices found\n");
      else
        Serial.println("done\n");

      delay(5000);           // wait 5 seconds for next scan
    }
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  • pavan

    Hi,

    Thank you for your input. The display is now working properly. It turns out I had connected the display pins from the wrong side based on the diagram.

    Thank you!!!

    0
  • Engineering Support
    Community moderator

    Hi Pavan,

    We are happy to hear that we could help resolve your issue. If you have any further questions, please let us know.

    0

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