Single channel ADC reading in Embedded C - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an ADC in embedded systems?

ADC stands for Analog-to-Digital Converter. It changes an analog voltage (like a sensor signal) into a digital number the microcontroller can understand.

beginner

Why do we use a single channel ADC reading?

We use single channel ADC reading to measure one analog input at a time, like reading the voltage from one sensor or a potentiometer.

beginner

What is the general process to read a value from a single channel ADC?

1. Select the ADC channel.<br>2. Start the ADC conversion.<br>3. Wait for conversion to finish.<br>4. Read the digital value from ADC data register.

intermediate

In embedded C, which register usually holds the ADC result?

The ADC result is typically stored in a register like ADC Data Register (e.g., ADC_DR or ADC_DATA). This depends on the microcontroller.

beginner

What does polling mean in the context of ADC reading?

Polling means the program waits and checks repeatedly if the ADC conversion is done before reading the result.

What is the first step in reading a single channel ADC value?

A Select the ADC channel

B Start the ADC conversion

C Read the ADC data register

D Wait for conversion to finish

You must first select which ADC channel to read before starting conversion.

What does ADC stand for?

A Advanced Digital Circuit

B Analog-to-Digital Converter

C Analog Data Channel

D Automatic Data Controller

ADC means Analog-to-Digital Converter, which converts analog signals to digital numbers.

How does polling work in ADC reading?

A Program skips waiting and reads immediately

B ADC automatically sends data without waiting

C Program waits and checks if conversion is done

D ADC converts multiple channels at once

Polling means the program waits and checks repeatedly until ADC conversion finishes.

Which of these is NOT part of single channel ADC reading?

A Selecting the channel

B Starting conversion

C Reading the conversion result

D Reading multiple channels simultaneously

Single channel ADC reading reads one channel at a time, not multiple simultaneously.

Where is the ADC conversion result stored?

A ADC data register

B General purpose register

C Program counter

D Stack pointer

The ADC result is stored in a special ADC data register.

Explain the steps to read a single channel ADC value in embedded C.

Think about what you do first, then how you know when to read the value.

Why is polling used in single channel ADC reading and how does it work?

Polling is like waiting for a green light before crossing.