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Published 20 hours ago • verified publisher icon ArduCAM

Trigger an image capture from another arduino module

Open Kel2D2 opened this issue 4 years ago • 3 comments

Hi,

I'm doing a project for school - I have little coding experience so please forgive lack of proper terminology, but is there a way to trigger an image capture on an arducam from data from another arduino module?

Specifically, I have a pulse sensor and an adurcam OV2640 2mp module wired to my arduino uno r3 board. The pulse sensor reads my heartbeat in bpms - when my bmp reaches a certain rate (say 110 bpm, can i use that data to trigger the arducam to take a picture?

Kel2D2 avatar Apr 22 '20 02:04 Kel2D2

Hello, I'm glad to help you. The one way is that call the Capture function and read out the image data when the bmp reaches a certain rate. The another way is that connect one pin to the external trigger pin on the camera and control it when the bmp reaches a certain rate.

ArducamSupport avatar Apr 23 '20 02:04 ArducamSupport

Thank you for you reply. Where can I find that 'capture function' in my code and how do I edit that? I have searched through the Arducam site, documentation, and tutorials and it's not clear at all. Right now I am using the example code for the OV2640 functions, and I have added in my code for the pulsesensor setup. (see below)

I have been reading through various threads and help forums and I'm finding out that a lot of people have asked about how to automatically trigger an image with an arducam, but there isn't a clear way to do that. Can you provide some clarity on that question?

Here is the code I am using:

//PulseSensor #define USE_ARDUINO_INTERRUPTS true // Set-up low-level interrupts for most acurate BPM math. #include <PulseSensorPlayground.h> // Includes the PulseSensorPlayground Library. //PulseSensor Variables const int PulseWire = 0; // PulseSensor PURPLE WIRE connected to ANALOG PIN 0 int Threshold = 550; // Determine which Signal to "count as a beat" and which to ignore.
PulseSensorPlayground pulseSensor; // Creates an instance of the PulseSensorPlayground object called "pulseSensor" // ArduCAM Mini #include <Wire.h> #include <ArduCAM.h> #include <SPI.h> #include "memorysaver.h" //This demo can only work on OV2640_MINI_2MP platform. #if !(defined OV2640_MINI_2MP) #error Please select the hardware platform and camera module in the ../libraries/ArduCAM/memorysaver.h file #endif #define BMPIMAGEOFFSET 66 const char bmp_header[BMPIMAGEOFFSET] PROGMEM = { 0x42, 0x4D, 0x36, 0x58, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x42, 0x00, 0x00, 0x00, 0x28, 0x00, 0x00, 0x00, 0x40, 0x01, 0x00, 0x00, 0xF0, 0x00, 0x00, 0x00, 0x01, 0x00, 0x10, 0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0x58, 0x02, 0x00, 0xC4, 0x0E, 0x00, 0x00, 0xC4, 0x0E, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xF8, 0x00, 0x00, 0xE0, 0x07, 0x00, 0x00, 0x1F, 0x00, 0x00, 0x00 }; // set pin 7 as the slave select for the digital pot: const int CS = 7; bool is_header = false; int mode = 0; uint8_t start_capture = 0; #if defined (OV2640_MINI_2MP) ArduCAM myCAM( OV2640, CS ); #else ArduCAM myCAM( OV5642, CS ); #endif uint8_t read_fifo_burst(ArduCAM myCAM);

void setup() { //PulseSensor Setup pulseSensor.analogInput(PulseWire); pulseSensor.setThreshold(Threshold);

//Camera Setup uint8_t vid, pid; uint8_t temp; #if defined(SAM3X8E) Wire1.begin(); Serial.begin(115200); #else Wire.begin(); Serial.begin(921600); #endif Serial.println(F("ACK CMD ArduCAM Start! END")); // set the CS as an output: pinMode(CS, OUTPUT); digitalWrite(CS, HIGH); // initialize SPI: SPI.begin(); //Reset the CPLD myCAM.write_reg(0x07, 0x80); delay(100); myCAM.write_reg(0x07, 0x00); delay(100); 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("ACK CMD SPI interface Error! END")); delay(1000);continue; }else{ Serial.println(F("ACK CMD SPI interface OK. END"));break; } }

#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 != 0x26 ) && (( pid != 0x41 ) || ( pid != 0x42 ))){ Serial.println(F("ACK CMD Can't find OV2640 module! END")); delay(1000);continue; } else{ Serial.println(F("ACK CMD OV2640 detected. END"));break; } } #else

#endif

//Change to JPEG capture mode and initialize the OV5642 module myCAM.set_format(JPEG); myCAM.InitCAM(); #if defined (OV2640_MINI_2MP) myCAM.OV2640_set_JPEG_size(OV2640_320x240); #else myCAM.write_reg(ARDUCHIP_TIM, VSYNC_LEVEL_MASK); //VSYNC is active HIGH myCAM.OV5642_set_JPEG_size(OV5642_320x240); #endif delay(1000); myCAM.clear_fifo_flag(); #if !(defined (OV2640_MINI_2MP)) myCAM.write_reg(ARDUCHIP_FRAMES,0x00); #endif }

void loop() { int myBPM = pulseSensor.getBeatsPerMinute(); // Calls function on our pulseSensor object that returns BPM as an "int". // "myBPM" hold this BPM value now.
// Camera: main code uint8_t temp = 0xff, temp_last = 0; bool is_header = false; if (Serial.available()) { temp = Serial.read(); switch (temp) { case 0: myCAM.OV2640_set_JPEG_size(OV2640_160x120);delay(1000); Serial.println(F("ACK CMD switch to OV2640_160x120 END")); temp = 0xff; break; case 1: myCAM.OV2640_set_JPEG_size(OV2640_176x144);delay(1000); Serial.println(F("ACK CMD switch to OV2640_176x144 END")); temp = 0xff; break; case 2: myCAM.OV2640_set_JPEG_size(OV2640_320x240);delay(1000); Serial.println(F("ACK CMD switch to OV2640_320x240 END")); temp = 0xff; break; case 3: myCAM.OV2640_set_JPEG_size(OV2640_352x288);delay(1000); Serial.println(F("ACK CMD switch to OV2640_352x288 END")); temp = 0xff; break; case 4: myCAM.OV2640_set_JPEG_size(OV2640_640x480);delay(1000); Serial.println(F("ACK CMD switch to OV2640_640x480 END")); temp = 0xff; break; case 5: myCAM.OV2640_set_JPEG_size(OV2640_800x600);delay(1000); Serial.println(F("ACK CMD switch to OV2640_800x600 END")); temp = 0xff; break; case 6: myCAM.OV2640_set_JPEG_size(OV2640_1024x768);delay(1000); Serial.println(F("ACK CMD switch to OV2640_1024x768 END")); temp = 0xff; break; case 7: myCAM.OV2640_set_JPEG_size(OV2640_1280x1024);delay(1000); Serial.println(F("ACK CMD switch to OV2640_1280x1024 END")); temp = 0xff; break; case 8: myCAM.OV2640_set_JPEG_size(OV2640_1600x1200);delay(1000); Serial.println(F("ACK CMD switch to OV2640_1600x1200 END")); temp = 0xff; break; case 0x10: mode = 1; temp = 0xff; start_capture = 1; Serial.println(F("ACK CMD CAM start single shoot. END")); break; case 0x11: temp = 0xff; myCAM.set_format(JPEG); myCAM.InitCAM(); #if !(defined (OV2640_MINI_2MP)) myCAM.set_bit(ARDUCHIP_TIM, VSYNC_LEVEL_MASK); #endif break; case 0x20: mode = 2; temp = 0xff; start_capture = 2; Serial.println(F("ACK CMD CAM start video streaming. END")); break; case 0x30: mode = 3; temp = 0xff; start_capture = 3; Serial.println(F("ACK CMD CAM start single shoot. END")); break; case 0x31: temp = 0xff; myCAM.set_format(BMP); myCAM.InitCAM(); #if !(defined (OV2640_MINI_2MP))
myCAM.clear_bit(ARDUCHIP_TIM, VSYNC_LEVEL_MASK); #endif myCAM.wrSensorReg16_8(0x3818, 0x81); myCAM.wrSensorReg16_8(0x3621, 0xA7); break; case 0x40: myCAM.OV2640_set_Light_Mode(Auto);temp = 0xff; Serial.println(F("ACK CMD Set to Auto END"));break; case 0x41: myCAM.OV2640_set_Light_Mode(Sunny);temp = 0xff; Serial.println(F("ACK CMD Set to Sunny END"));break; case 0x42: myCAM.OV2640_set_Light_Mode(Cloudy);temp = 0xff; Serial.println(F("ACK CMD Set to Cloudy END"));break; case 0x43: myCAM.OV2640_set_Light_Mode(Office);temp = 0xff; Serial.println(F("ACK CMD Set to Office END"));break; case 0x44: myCAM.OV2640_set_Light_Mode(Home); temp = 0xff; Serial.println(F("ACK CMD Set to Home END"));break; case 0x50: myCAM.OV2640_set_Color_Saturation(Saturation2); temp = 0xff; Serial.println(F("ACK CMD Set to Saturation+2 END"));break; case 0x51: myCAM.OV2640_set_Color_Saturation(Saturation1); temp = 0xff; Serial.println(F("ACK CMD Set to Saturation+1 END"));break; case 0x52: myCAM.OV2640_set_Color_Saturation(Saturation0); temp = 0xff; Serial.println(F("ACK CMD Set to Saturation+0 END"));break; case 0x53: myCAM. OV2640_set_Color_Saturation(Saturation_1); temp = 0xff; Serial.println(F("ACK CMD Set to Saturation-1 END"));break; case 0x54: myCAM.OV2640_set_Color_Saturation(Saturation_2); temp = 0xff; Serial.println(F("ACK CMD Set to Saturation-2 END"));break; case 0x60: myCAM.OV2640_set_Brightness(Brightness2); temp = 0xff; Serial.println(F("ACK CMD Set to Brightness+2 END"));break; case 0x61: myCAM.OV2640_set_Brightness(Brightness1); temp = 0xff; Serial.println(F("ACK CMD Set to Brightness+1 END"));break; case 0x62: myCAM.OV2640_set_Brightness(Brightness0); temp = 0xff; Serial.println(F("ACK CMD Set to Brightness+0 END"));break; case 0x63: myCAM. OV2640_set_Brightness(Brightness_1); temp = 0xff; Serial.println(F("ACK CMD Set to Brightness-1 END"));break; case 0x64: myCAM.OV2640_set_Brightness(Brightness_2); temp = 0xff; Serial.println(F("ACK CMD Set to Brightness-2 END"));break; case 0x70: myCAM.OV2640_set_Contrast(Contrast2);temp = 0xff; Serial.println(F("ACK CMD Set to Contrast+2 END"));break; case 0x71: myCAM.OV2640_set_Contrast(Contrast1);temp = 0xff; Serial.println(F("ACK CMD Set to Contrast+1 END"));break; case 0x72: myCAM.OV2640_set_Contrast(Contrast0);temp = 0xff; Serial.println(F("ACK CMD Set to Contrast+0 END"));break; case 0x73: myCAM.OV2640_set_Contrast(Contrast_1);temp = 0xff; Serial.println(F("ACK CMD Set to Contrast-1 END"));break; case 0x74: myCAM.OV2640_set_Contrast(Contrast_2);temp = 0xff; Serial.println(F("ACK CMD Set to Contrast-2 END"));break; case 0x80: myCAM.OV2640_set_Special_effects(Antique);temp = 0xff; Serial.println(F("ACK CMD Set to Antique END"));break; case 0x81: myCAM.OV2640_set_Special_effects(Bluish);temp = 0xff; Serial.println(F("ACK CMD Set to Bluish END"));break; case 0x82: myCAM.OV2640_set_Special_effects(Greenish);temp = 0xff; Serial.println(F("ACK CMD Set to Greenish END"));break;
case 0x83: myCAM.OV2640_set_Special_effects(Reddish);temp = 0xff; Serial.println(F("ACK CMD Set to Reddish END"));break;
case 0x84: myCAM.OV2640_set_Special_effects(BW);temp = 0xff; Serial.println(F("ACK CMD Set to BW END"));break; case 0x85: myCAM.OV2640_set_Special_effects(Negative);temp = 0xff; Serial.println(F("ACK CMD Set to Negative END"));break; case 0x86: myCAM.OV2640_set_Special_effects(BWnegative);temp = 0xff; Serial.println(F("ACK CMD Set to BWnegative END"));break;
case 0x87: myCAM.OV2640_set_Special_effects(Normal);temp = 0xff; Serial.println(F("ACK CMD Set to Normal END"));break;
} } if (mode == 1) { if (start_capture == 1) { myCAM.flush_fifo(); myCAM.clear_fifo_flag(); //Start capture myCAM.start_capture(); start_capture = 0; } if (myCAM.get_bit(ARDUCHIP_TRIG, CAP_DONE_MASK)) { Serial.println(F("ACK CMD CAM Capture Done. END"));delay(50); read_fifo_burst(myCAM); //Clear the capture done flag myCAM.clear_fifo_flag(); } } else if (mode == 2) { while (1) { temp = Serial.read(); if (temp == 0x21) { start_capture = 0; mode = 0; Serial.println(F("ACK CMD CAM stop video streaming. END")); break; } switch (temp) { case 0x40: myCAM.OV2640_set_Light_Mode(Auto);temp = 0xff; Serial.println(F("ACK CMD Set to Auto END"));break; case 0x41: myCAM.OV2640_set_Light_Mode(Sunny);temp = 0xff; Serial.println(F("ACK CMD Set to Sunny END"));break; case 0x42: myCAM.OV2640_set_Light_Mode(Cloudy);temp = 0xff; Serial.println(F("ACK CMD Set to Cloudy END"));break; case 0x43: myCAM.OV2640_set_Light_Mode(Office);temp = 0xff; Serial.println(F("ACK CMD Set to Office END"));break; case 0x44: myCAM.OV2640_set_Light_Mode(Home); temp = 0xff; Serial.println(F("ACK CMD Set to Home END"));break; case 0x50: myCAM.OV2640_set_Color_Saturation(Saturation2); temp = 0xff; Serial.println(F("ACK CMD Set to Saturation+2 END"));break; case 0x51: myCAM.OV2640_set_Color_Saturation(Saturation1); temp = 0xff; Serial.println(F("ACK CMD Set to Saturation+1 END"));break; case 0x52: myCAM.OV2640_set_Color_Saturation(Saturation0); temp = 0xff; Serial.println(F("ACK CMD Set to Saturation+0 END"));break; case 0x53: myCAM. OV2640_set_Color_Saturation(Saturation_1); temp = 0xff; Serial.println(F("ACK CMD Set to Saturation-1 END"));break; case 0x54: myCAM.OV2640_set_Color_Saturation(Saturation_2); temp = 0xff; Serial.println(F("ACK CMD Set to Saturation-2 END"));break; case 0x60: myCAM.OV2640_set_Brightness(Brightness2); temp = 0xff; Serial.println(F("ACK CMD Set to Brightness+2 END"));break; case 0x61: myCAM.OV2640_set_Brightness(Brightness1); temp = 0xff; Serial.println(F("ACK CMD Set to Brightness+1 END"));break; case 0x62: myCAM.OV2640_set_Brightness(Brightness0); temp = 0xff; Serial.println(F("ACK CMD Set to Brightness+0 END"));break; case 0x63: myCAM. OV2640_set_Brightness(Brightness_1); temp = 0xff; Serial.println(F("ACK CMD Set to Brightness-1 END"));break; case 0x64: myCAM.OV2640_set_Brightness(Brightness_2); temp = 0xff; Serial.println(F("ACK CMD Set to Brightness-2 END"));break; case 0x70: myCAM.OV2640_set_Contrast(Contrast2);temp = 0xff; Serial.println(F("ACK CMD Set to Contrast+2 END"));break; case 0x71: myCAM.OV2640_set_Contrast(Contrast1);temp = 0xff; Serial.println(F("ACK CMD Set to Contrast+1 END"));break; case 0x72: myCAM.OV2640_set_Contrast(Contrast0);temp = 0xff; Serial.println(F("ACK CMD Set to Contrast+0 END"));break; case 0x73: myCAM.OV2640_set_Contrast(Contrast_1);temp = 0xff; Serial.println(F("ACK CMD Set to Contrast-1 END"));break; case 0x74: myCAM.OV2640_set_Contrast(Contrast_2);temp = 0xff; Serial.println(F("ACK CMD Set to Contrast-2 END"));break; case 0x80: myCAM.OV2640_set_Special_effects(Antique);temp = 0xff; Serial.println(F("ACK CMD Set to Antique END"));break; case 0x81: myCAM.OV2640_set_Special_effects(Bluish);temp = 0xff; Serial.println(F("ACK CMD Set to Bluish END"));break; case 0x82: myCAM.OV2640_set_Special_effects(Greenish);temp = 0xff; Serial.println(F("ACK CMD Set to Greenish END"));break;
case 0x83: myCAM.OV2640_set_Special_effects(Reddish);temp = 0xff; Serial.println(F("ACK CMD Set to Reddish END"));break;
case 0x84: myCAM.OV2640_set_Special_effects(BW);temp = 0xff; Serial.println(F("ACK CMD Set to BW END"));break; case 0x85: myCAM.OV2640_set_Special_effects(Negative);temp = 0xff; Serial.println(F("ACK CMD Set to Negative END"));break; case 0x86: myCAM.OV2640_set_Special_effects(BWnegative);temp = 0xff; Serial.println(F("ACK CMD Set to BWnegative END"));break;
case 0x87: myCAM.OV2640_set_Special_effects(Normal);temp = 0xff; Serial.println(F("ACK CMD Set to Normal END"));break;
} if (start_capture == 2) { myCAM.flush_fifo(); myCAM.clear_fifo_flag(); //Start capture myCAM.start_capture(); start_capture = 0; } if (myCAM.get_bit(ARDUCHIP_TRIG, CAP_DONE_MASK)) { uint32_t length = 0; length = myCAM.read_fifo_length(); if ((length >= MAX_FIFO_SIZE) | (length == 0)) { myCAM.clear_fifo_flag(); start_capture = 2; continue; } myCAM.CS_LOW(); myCAM.set_fifo_burst();//Set fifo burst mode temp = SPI.transfer(0x00); length --; while ( length-- ) { temp_last = temp; temp = SPI.transfer(0x00); if (is_header == true) { Serial.write(temp); } else if ((temp == 0xD8) & (temp_last == 0xFF)) { is_header = true; Serial.println(F("ACK IMG END")); Serial.write(temp_last); Serial.write(temp); } if ( (temp == 0xD9) && (temp_last == 0xFF) ) //If find the end ,break while, break; delayMicroseconds(15); } myCAM.CS_HIGH(); myCAM.clear_fifo_flag(); start_capture = 2; is_header = false; } } } else if (mode == 3) { if (start_capture == 3) { //Flush the FIFO myCAM.flush_fifo(); myCAM.clear_fifo_flag(); //Start capture myCAM.start_capture(); start_capture = 0; } if (myCAM.get_bit(ARDUCHIP_TRIG, CAP_DONE_MASK)) { Serial.println(F("ACK CMD CAM Capture Done. END"));delay(50); uint8_t temp, temp_last; uint32_t length = 0; length = myCAM.read_fifo_length(); if (length >= MAX_FIFO_SIZE ) { Serial.println(F("ACK CMD Over size. END")); myCAM.clear_fifo_flag(); return; } if (length == 0 ) //0 kb { Serial.println(F("ACK CMD Size is 0. END")); myCAM.clear_fifo_flag(); return; } myCAM.CS_LOW(); myCAM.set_fifo_burst();//Set fifo burst mode

Serial.write(0xFF);
Serial.write(0xAA);
for (temp = 0; temp < BMPIMAGEOFFSET; temp++)
{
  Serial.write(pgm_read_byte(&bmp_header[temp]));
}
//for old version, enable it else disable

// SPI.transfer(0x00); char VH, VL; int i = 0, j = 0; for (i = 0; i < 240; i++) { for (j = 0; j < 320; j++) { VH = SPI.transfer(0x00);; VL = SPI.transfer(0x00);; Serial.write(VL); delayMicroseconds(12); Serial.write(VH); delayMicroseconds(12); } } Serial.write(0xBB); Serial.write(0xCC); myCAM.CS_HIGH(); //Clear the capture done flag myCAM.clear_fifo_flag(); } } } uint8_t read_fifo_burst(ArduCAM myCAM) { uint8_t temp = 0, temp_last = 0; uint32_t length = 0; length = myCAM.read_fifo_length(); Serial.println(length, DEC); if (length >= MAX_FIFO_SIZE) //512 kb { Serial.println(F("ACK CMD Over size. END")); return 0; } if (length == 0 ) //0 kb { Serial.println(F("ACK CMD Size is 0. END")); return 0; } myCAM.CS_LOW(); myCAM.set_fifo_burst();//Set fifo burst mode temp = SPI.transfer(0x00); length --; while ( length-- ) { temp_last = temp; temp = SPI.transfer(0x00); if (is_header == true) { Serial.write(temp); } else if ((temp == 0xD8) & (temp_last == 0xFF)) { is_header = true; Serial.println(F("ACK IMG END")); Serial.write(temp_last); Serial.write(temp); } if ( (temp == 0xD9) && (temp_last == 0xFF) ) //If find the end ,break while, break; delayMicroseconds(15); } myCAM.CS_HIGH(); is_header = false; return 1; }

Kel2D2 avatar Apr 24 '20 05:04 Kel2D2

Hi, This is the capture process: `myCAM.flush_fifo(); myCAM.clear_fifo_flag(); //Start capture myCAM.start_capture();

if (myCAM.get_bit(ARDUCHIP_TRIG, CAP_DONE_MASK)) { Serial.println(F("ACK CMD CAM Capture Done. END"));delay(50); read_fifo_burst(myCAM); //Clear the capture done flag myCAM.clear_fifo_flag(); }` After capture done, you can read out the data from fifo. The above demo due to the receive function of serial port , it's not too clear. For detail process of capture and store, I suggest you refer to thishttps://github.com/ArduCAM/Arduino/tree/master/ArduCAM/examples/mini/ArduCAM_Mini_PIR_Trig_Capture2SD.

ArducamSupport avatar Apr 24 '20 08:04 ArducamSupport