Thanks for your help. Yesterday I moved my Raspberry Pi cam v2.1 with the rpi robot chassis and the camera won’t take pictures. But, the day before, the camera functioned properly. Why do you think this is happening, is the camera damaged? I've tried pressing all the chips I could on the camera's circuit board in case a chip (like Sunny) was loose. And I've tried the camera with two different Raspberry Pis using the same micro SD card. Thanks for your help.
pi@raspberrypi:~ $ raspistill -v -o newpic.jpg raspistill Camera App v1.3.11 Width 3280, Height 2464, quality 85, filename newpic.jpg Time delay 5000, Raw no Thumbnail enabled Yes, width 64, height 48, quality 35 Link to latest frame enabled no Full resolution preview No Capture method : Single capture Preview Yes, Full screen Yes Preview window 0,0,1024,768 Opacity 255 Sharpness 0, Contrast 0, Brightness 50 Saturation 0, ISO 0, Video Stabilisation No, Exposure compensation 0 Exposure Mode 'auto', AWB Mode 'auto', Image Effect 'none' Flicker Avoid Mode 'off' Metering Mode 'average', Colour Effect Enabled No with U = 128, V = 128 Rotation 0, hflip No, vflip No ROI x 0.000000, y 0.000000, w 1.000000 h 1.000000 Camera component done Encoder component done Starting component connection stage Connecting camera preview port to video render. Connecting camera stills port to encoder input port Opening output file newpic.jpg Enabling encoder output port Starting capture -1 mmal: No data received from sensor. Check all connections, including the Sunny one on the camera board ^Cmmal: Aborting program pi@raspberrypi:~ $ vcgencmd get_camera supported=1 detected=1