"Can't find OV2640 module!"

[ghost]

Hello,

I'm trying to get an Arducam MINI 2MP OV2640 to work with my Arduino UNO which is connected to a microSD shield. I connected both the microSD-shield and the Arducam to the pins of the Arduino UNO,

After some trial and error, I am getting the error message "Can't find OV2640 module !" which comes from the following part of the example code:

ArduCAM_Mini_Capture2SD

`void setup(){

 Wire.begin();

  uint8_t vid, pid;
  uint8_t temp;

  Serial.begin(115200);
  Serial.println(F("ArduCAM Start!"));
  //set the CS as an output:
  pinMode(SPI_CS,OUTPUT);
  // initialize SPI:
  SPI.begin();
  while(1){
    //Check if the ArduCAM SPI bus is OK
    myCAM.write_reg(ARDUCHIP_TEST1, 0x55);
    temp = myCAM.read_reg(ARDUCHIP_TEST1);

    if (temp != 0x55){
      Serial.println(F("SPI interface Error!"));
      delay(1000);continue;
    }else{
      Serial.println(F("SPI interface OK."));break;
    }
  }
  //Initialize SD Card
  while(!SD.begin(SD_CS)){
    Serial.println(F("SD Card Error!"));delay(1000);
  }
  Serial.println(F("SD Card detected."));

  Serial.print(" vid: ");      
  Serial.print(vid);
  Serial.print(" pid: ");
  Serial.print(pid);
  #if defined (OV2640_MINI_2MP)
    while(1){
      //Check if the camera module type is OV2640
      myCAM.wrSensorReg8_8(0xff, 0x01);
      myCAM.rdSensorReg8_8(OV2640_CHIPID_HIGH, &vid);
      myCAM.rdSensorReg8_8(OV2640_CHIPID_LOW, &pid);
      if ((vid != 0x71 ) && (( pid != 0x1c ) || ( pid != 0x42 ))){

        Serial.println(F("Can't find OV2640 module!"));
        delay(1000);continue;
      }
      else{
        Serial.println(F("OV2640 detected."));break;
      } 
    }
  #elif defined (OV3640_MINI_3MP)
    while(1){
      //Check if the camera module type is OV3640
      myCAM.rdSensorReg16_8(OV3640_CHIPID_HIGH, &vid);
      myCAM.rdSensorReg16_8(OV3640_CHIPID_LOW, &pid);
      if ((vid != 0x71) || (pid != 0x4C)){
        Serial.println(F("Can't find OV3640 module!"));
        delay(1000);continue; 
      }else{
        Serial.println(F("OV3640 detected."));break;    
      }
   } 
  #else
    while(1){
      //Check if the camera module type is OV5642
      myCAM.wrSensorReg16_8(0xff, 0x01);
      myCAM.rdSensorReg16_8(OV5642_CHIPID_HIGH, &vid);
      myCAM.rdSensorReg16_8(OV5642_CHIPID_LOW, &pid);
      if((vid != 0x56) || (pid != 0x42)){
        Serial.println(F("Can't find OV5642 module!"));
        delay(1000);continue;
      }
      else{
        Serial.println(F("OV5642 detected."));break;
      } 
    }
  #endif
  myCAM.set_format(JPEG);
  myCAM.InitCAM();
  #if defined (OV2640_MINI_2MP)
    myCAM.OV2640_set_JPEG_size(OV2640_320x240);
  #elif defined (OV3640_MINI_3MP)
    myCAM.OV3640_set_JPEG_size(OV3640_320x240);
  #else
    myCAM.write_reg(ARDUCHIP_TIM, VSYNC_LEVEL_MASK);   //VSYNC is active HIGH
    myCAM.OV5642_set_JPEG_size(OV5642_320x240);
  #endif
  delay(1000);

}`

and from ArduCAM_Mini_2MP_OV2640_functions

#if defined (OV2640_MINI_2MP) while(1){ //Check if the camera module type is OV2640 myCAM.wrSensorReg8_8(0xff, 0x01); myCAM.rdSensorReg8_8(OV2640_CHIPID_HIGH, &vid); myCAM.rdSensorReg8_8(OV2640_CHIPID_LOW, &pid); if ((vid != 0xB6 ) && (( pid != 0x00 ) || ( pid != 0x42 ))){ Serial.print(F("ACK CMD Can't find OV2640 module!")); Serial.print("vid: "); Serial.print(vid); Serial.print(" pid: "); Serial.println(pid); delay(1000);continue; } else{ Serial.println(F("ACK CMD OV2640 detected."));break; } }

I changed the values (vid 0xB6, pid 0x00, and pid 0x42) and problems are still persisting. When I check my serial monitor, all I see are dots. I made a chart of the values I have gotten, and the values I need.

___ | EXPECT | values | need
VID | 0x26 | 38 | 0x69 105 PID | 0x41 | 65 | PID | 0x42 | 65 | 0x1C 28 VID | | | 182 PID | | 0 | 0

@UCTRONICS

[UCTRONICS]

@mtronmaddie

The 2MP‘s pid is 0x42 and vid is 0x26. How do you change it ? Please try the below code : while(1){ //Check if the camera module type is OV2640 myCAM.wrSensorReg8_8(0xff, 0x01); myCAM.rdSensorReg8_8(OV2640_CHIPID_HIGH, &vid); myCAM.rdSensorReg8_8(OV2640_CHIPID_LOW, &pid); if ((vid != 0x26 ) && (( pid != 0x41 ) || ( pid != 0x42 ))){ Serial.println(F("Can't find OV2640 module!")); delay(1000);continue; } else{ Serial.println(F("OV2640 detected."));break; } }

[ghost]

@UCTRONICS, I was not changing the values I was getting from the ArduCAM, but I was reading different vid and pid values depending on which sample code I was running.

The vid values I got were (0x69) and pid (0x1C) from the ArduCAM_Mini_Capture2SD sample code. When I tried the ArduCAM_Mini_2MP_OV2640_functions code, I got values of (182 decimal) for vid and (0) for pid.

I'm pretty sure I bought the correct camera. Why would the values be changing?

[UCTRONICS]

@mtronmaddie From the phenomenon, It maybe because of the bad hardware connection and the driver of I2C . I advice you test your i2c bus separately. Notice: The connection between the UNO and camera shoud be as short as possible.

[ghost]

@UCTRONICS, I’m using SPI, not I2C. And my connection is fine!

[UCTRONICS]

@mtronmaddie The code read the camera's ID (pid and vid )through I2C interface.

[ghost]

We connected the I2C wires, but the values we're reading for pid & vid are not the expected values for a OV2640 module (Mini 2MP). Why would the values on our board not match what is expected?

[UCTRONICS]

@mtronmaddie Please use another mini demo to try. If you are ensure your hardware connection is fine and your software configure is right as our video guide. https://www.youtube.com/watch?v=hybQpjwJ4aA&feature=youtu.be Maybe your camera is defective and we will give you a resend .