http://blog.uctronics.com/downloads/shields/ArduCAM_Camera_Shield_V2_DS.pdf
ArduCAM demo (C) 2017 Lee
// URL: HTTP: //www.ArduCAM.com
// how this program is to use most of the features of the demo
// library has supported camera module.
// This demo is only available in ARDUCAM_SHIELD_V2 platform.
This demo is compatible with ESP8266 //
// This demo applies to Omnivision OV2640 / OV5640 / OV5642 / sensor.
// ArduCAM it will become a real digital camera with capture and playback functions.
// 1. Real-time video preview on the LCD screen.
// 2. captured image to the FIFO buffer and fast shutter.
// 3. image stored in BMP format Micro SD / TF card.
// 4. When the photo shutter button for 3 seconds to play by one shot.
// This procedure requires ArduCAM V4.0.0 (or later) Library screen V2 and ArduCAM
// using Arduino IDE 1.6.8 or later compiler