How can I increase the sampling rate for AnalogRead() on Arduino Uno?

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The discussion focuses on increasing the sampling rate for the AnalogRead() function on the Arduino Uno, which is currently limited to 30 samples per second. Users inquire about adjusting the clock prescaler for the Analog-to-Digital Converter (ADC) to enhance this rate. Reference to the Atmel documentation is provided for detailed guidance on modifying the prescaler settings. The ADC is confirmed to be integrated within the processor, which influences its performance. Adjusting the clock prescaler can potentially improve sampling rates significantly.
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I connected the A0 pin of arduino uno to +5V and read the voltage using analogRead () and displayed the result and elapsed time on the serial monitor. Its reading only 30 samples per second. What's going wrong? How do I change the clock prescaler for the ADC?
 
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