If you have an adafruit TTL Serial JPEG Camera you may have found that downloading an uncompressed 640×480 JPEG from the camera can take up to 15 seconds. Depending on your application this might be far too long!
To speed things up a bit you can add compression to the image. Adding up to 40% can decrease the download time for a picture to about 5 seconds but at the same time you have to sacrifice picture quality.
Ttl Serial Camera Arduino Code
So how else can you speed up the transfer? How about upping the transfer speed!
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The camera by default uses 38400 baud but it is capable of much more than this. The question though is how to change the settings?
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The Arduino Uno can do up to 115200 baud so it seems like a good idea to me to set the camera to the same speed. This should improve the download times by a fair bit more. (At the present time I haven’t been able to test by how much.)
So how do you get the camera to run at this faster speed? adafruit provide a library for the Arduino that provides functions for virtually all the things you might want to use on the camera. Unfortunately, at present there isn’t a function for changing the baud. After doing a lot of hunting around the interwebs I found there were quite a few people wanting to change the baud but no answer on how to do it. I put my thinking hat on and after a few hours of experimenting I came up with the following test code…
#include <SoftwareSerial.h>
Ttl Serial Camera Arduino Download
SoftwareSerial softSerial(2, 3); //Set Software serial to use Pins 2 and 3
char serInStr[100];
int serInIdx =0;
int serOutIdx =0;
Ttl Serial Camera Arduino Uno De
void setup() {
Serial.begin(9600); //Set Hardware Serial to 9600 baud - For outputting debug messages
Serial.println('Start');
softSerial.begin(38400); //Set Software serial to 38400 baud - Default setting for the camera
Serial.println('Softserial Baud has been set to 38400');
delay(10); //Pause for 10ms to let it all settle down. Probably not needed!
Serial.println('Get Camera Version');
getCamVers(); //Call getCamVers function
Serial.println('Setting Camera Baud to 115200');
setBaudMax(); //Call setBaudMax function
Serial.println('Reset softSerial to 115200');
softSerial.end(); //Disconnect serial connection to camera
softSerial.begin(115200); //Reconnect serial connection to camera at 115200 baud
Serial.println('Get Camera Version again using 115200');
getCamVers(); //Check camera version again to prove everything is working at 115200
}
void loop() {
//Do nothing
}
void getCamVers() {
Ttl Serial Camera
uint8_t ByteData[5]={0x56, 0x00, 0x11, 0x00}; //String of bytes that requests version number from camera
softSerial.write(ByteData,5); //Send string to camera
delay(10); //Pause to let the camera deal with the request
if(softSerial.available()){ //Check if serial buffer has a response from camera
while(softSerial.available()){ //Loop as long as the serial buffer contains data
serInStr[serInIdx] = softSerial.read(); //Read data from serial buffer. Copy into array
serInIdx++; //Increase array count by 1
}
}
for(serOutIdx=0; serOutIdx < serInIdx; serOutIdx++) { //Loop through array
Serial.print(serInStr[serOutIdx]); //Print each value in array to consol
}
Serial.println(); //Print end of line
}
void setBaudMax() {
Ttl Serial Camera Arduino Uno De C
uint8_t ByteData[7]={0x56, 0x00, 0x24, 0x03, 0x01, 0x0D, 0xA6}; //String that sets baud to 115200
softSerial.write(ByteData,7); //Send string to camera
//Should really check for a suitable response here!
Ttl Serial Camera Arduino Code
}