This set of Advanced Arduino Questions and Answers focuses on “OV7076 Camera Module”.
1. What is the use of the OV7670 Camera Module?
a) Monitors Motion
b) Evaluates air pressure
c) Network Provider
d) Image Capture
View Answer
Explanation: The OV7670 Camera Module is basically an image capturing device which is designed for use in embedded systems. It uses a 3.3V Power supply and an external oscillator provides the clock source for the XCLK pin.
2. How many pins are present in the OV7670 Camera Module?
a) 18
b) 10
c) 8
d) 50
View Answer
Explanation: The OV7670 Camera Module has 18 pins which includes the Vdd for Power supply, GND for grounding, SDIOC for SCCB clock, SDIOD for SCCB data, VSYNC for Vertical Sync, HREF for Horizontal Sync, PCLK for Pixel Clock, XCLK for System Clock, D0 to D7 pins are for Video output, RESET for resetting the module, and PDWN for powering down the module.
3. What is the resolution of the OV7670 Camera Module?
a) 640×480 VGA
b) 640×481 VGA
c) 640×1020 VGA
d) 640×12 VGA
View Answer
Explanation: 640×480 VGA is the correct resolution of the OV7670 Camera Module. The resolution of a camera is the number of pixels that the camera output has,both horizontal and vertical that forms the image matrix, be it for still images or video outputs.
4. What will happen if we supply a voltage of 250 kV to the Vdd of the EOV7670 Camera Module ?
a) Damage is caused
b) Module will shut down
c) Module will not respond for the time the voltage is applied
d) Module will function normally
View Answer
Explanation: The OV7670 Camera Modules are mostly built to work on a voltage of approximately 3.3V. Any voltage lower than that and the sensor will not be able to power on, but however any voltage significantly above that and the sensor may suffer permanent damage.
5. Can we directly connect the Arduino’s 5V power supply to the OV7670 Camera Module?
a) Yes
b) No
View Answer
Explanation: The OV7670 Camera Module has a voltage rating of 3.3V so if we are to connect it to the 5V Arduino output, it will damage the internal circuit for the module. So we need to add a potential divider in the area to bring the voltage down.
6. What is the nature of the video output protocol in the OV7670 Camera Module?
a) Serial Analog
b) Parallel Analog
c) Parallel Digital
d) Serial Digital
View Answer
Explanation: The output format in the OV7670 Camera Module is Parallel Digital. This is due to the fact that it has 8 pins dedicated to video output marked from D0 to D7 on the module which are to be connected to the Arduino for the output.
7. What kind of device is the ESP8266 WiFi Module?
a) Passive Sensor
b) Active Sensor
c) Transducer Device
d) Switching Device
View Answer
Explanation: The OV7670 Camera Module acts like a transducer. Transducers convert an input from one physical form to another. In this case, the camera module converts light patterns into electrical signals to be used for further processing.
8. What is the type of waves that the ESP8266 WiFi Module detects?
a) Infrared Signal
b) Radio Signal
c) VL Signal
d) Hybrid Signal
View Answer
Explanation: The OV7670 Camera Module detects light wave patterns which fall in the visible spectrum, that is approximately 700 nm. This is roughly the light waves which are also visible to the naked human eye.
9. What technology does the OV7670 Camera Module use for image sub-sampling?
a) VarioPixel
b) ConstPix
c) Activarr
d) Tidal
View Answer
Explanation: VarioPixel is the correct name of the sub-sampling technology used by the OV7670 Camera Module. Sub-sampling in image processing is the process of reducing the image size by removing information all together.
10. Does the OV7670 Camera Module support Lens Shading Correction?
a) Yes
b) No
View Answer
Explanation: Lens shading correction helps software remove image structures that originate in the imaging system and don’t belong to the actual image information hence giving drastically more accurate images.
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