[Solved] What will be the output of this Python code snippet reading channel 1 from MCP3008? import spidev spi = spidev.... What will be the output of this Python code snippet reading channel 1 from MCP3008? | Raspberry Pi

Raspberry Pi - SPI Communication

What will be the output of this Python code snippet reading channel 1 from MCP3008? import spidev spi = spidev.SpiDev() spi.open(0,0) resp = spi.xfer2([1, (8+1)<<4, 0]) data = ((resp[1]&3) << 8) + resp[2] print(data)

AA string describing the sensor type

BAn integer between 0 and 1023 representing the analog value

CAn error because of wrong SPI command format

DAlways zero regardless of input

Step-by-Step Solution

Solution:

Step 1: Understand SPI transfer command
The command [1, (8+1)<<4, 0] requests data from channel 1 of MCP3008 using correct bit shifting.
Step 2: Calculate data from response bytes
Data is extracted by combining bits from resp[1] and resp[2], resulting in a 10-bit integer (0-1023) representing analog input.
Final Answer:
An integer between 0 and 1023 representing the analog value -> Option B
Quick Check:
SPI read output = 0-1023 integer [OK]

Quick Trick: MCP3008 returns 10-bit integer values via SPI [OK]

Common Mistakes:

MISTAKES

Misunderstanding bit shifting in command
Expecting string output instead of integer
Incorrectly parsing response bytes

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What will be the output of this Python code snippet reading channel 1 from MCP3008?

Step 1: Understand SPI transfer command

Step 2: Calculate data from response bytes

Final Answer:

Quick Check:

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