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Twig-Serial Camera 1. Introduction 

Serial Camera v0.9b is a JPEG color camera module easy for MCU use.It has integrated image processing DSP to generate 320x240 or 640x480 JPEG image without thumbnail information, captured picture will be stored in internal buffer and transferred via UART port.

2. Specification 

Stem - Base Shield Interface



Default baud rate of serial port is 115200



640x480/320x240(default) resolution



JPEG compressed image without Thumbnail Information



DC 5v power supply

 

Small and compact Protocol control



Size 32mm X 32mm



Current consumption: 80-100mA

3. Application a. Different image capture systems b. Environmental monitoring c. Industry monitoring d. Medical equipment e. Video phone

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f. Security g. Vehicle based GPS

4. Communication Protocol 1. Reset Command

Return

0x56 0x00 0x26 0x00

0x76 0x00 0x26 0x00

2. Take picture Command

Return

0x56 0x00 0x36 0x01 0x00

0x76 0x00 0x36 0x00 0x00

3. Read JPEG file size Command

Return

0x56 0x00 0x34 0x01 0x00

0x76 0x00 0x34 0x00 0x04 0x00 0x00 0xXH 0xXL

Note: XH XL is the file length of JPEG file, MSB is in the front, and followed by LSB. 4. Read JPEG file data JPEG file starts with FF D8 and ends with FF D9. To read the JPEG file, always starts with address 00 00,and choose a chunk size that are an integer times of 8, and read the chunk many times until reds FF D9 which indicates the end of the JPEG file. Command

Return

0x56 0x00 0x32 0x0C 0x00 0x0A 0x00 0x00 0xAH 0xAL 0x00 0x00 0xLH 0xLL 0xXX 0xXX

0x76 0x00 0x32 0x00 0x00 (Interval time) 0xFF 0xD8 ... (Interval time)0x76 0x00 0x32 0x00 0x00

Note:(Interval time) = 0xXX 0xXX * 0.01ms, this is recommended to be 0x000A 0x0000AHAL:start address of the data to read

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0x0000LHLL:Length of the data to read a time

5. Stop taking pictures Command

Return

0x56 0x00 0x36 0x01 0x03

0x76 0x00 0x36 0x00 0x00

6. Compression Ratio Command

Return

0x56 0x00 0x31 0x05 0x01 0x01 0x12 0x04 0xXX

0x76 0x00 0x31 0x00 0x00 0xXX

Note: 0xXX:0x00~0xFF normally is x36 7. Set Image size Command

Return

0x56 0x00 0x31 0x05 0x04 0x01 0x00 0x19 0x11 (320*240)

0x76 0x00 0x31 0x00 0x00

0x56 0x00 0x31 0x05 0x04 0x01 0x00 0x19 0x00 (640*480)

0x76 0x00 0x31 0x00 0x00

8. Continue to take a picture Command

Return

0x56 0x00 0x36 0x01 0x02

0x76 0x00 0x36 0x00 0x00

9. Power Saving Enter Power Saving Command

Return

0x56 0x00 0x3e 0x03 0x00 0x01 0x01

0x76 0x00 0x3e 0x00 0x00

Exit Power Saving Command

Return

0x56 0x00 0x3e 0x03 0x00 0x01 0x00

0x76 0x00 0x3e 0x00 0x00

10. Chang baud rate Command

Return

0x56 0x00 0x24 0x03 0x01 0xXX 0xXX

0x76 0x00 0x24 0x00 0x00

0xXX 0xXX

Baud rate

0xae 0xc8

9600

0x56 0xe4

19200

0x2a 0xf2

38400

0x1c 0x4c

57600

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0x0d 0xa6

115200

5.Program flow chart Power up

Send:0x56 0x00 0x26 0x00

Send:0x56 0x00 0x36 0x01 0x00

Send:0x56 0x00 0x34 0x01 0x00

Send:0x56 0x00 0x32 0x0C 0x00 0x0A 0x00 0x00 0xAH 0xAL 0x00 0x00 0xLH 0xLL

Read next frame of data Read out all of the data?

Y Send:0x56 0x00 0x36 0x01 0x03

END

N

Twig-Serial Camera - GitHub

many times until reds FF D9 which indicates the end of the JPEG file. Command. Return. 0x56 0x00 0x32 0x0C 0x00 0x0A. 0x00 0x00 0xAH 0xAL. 0x00 0x00 ...

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