Polaris Smart Metering Embedded Engineer Interview Questions, Process, and Tips

Q1. How clcd works and explain in detail
Ans. 
CLCD stands for Character LCD. It is a type of display commonly used in embedded systems to show text and simple graphics.
• CLCD displays characters and symbols by controlling individual pixels on the screen

• It typically has a predefined set of characters stored in ROM, which can be displayed by sending corresponding ASCII values

• CLCDs are commonly interfaced with microcontrollers using protocols like I2C or SPI

• Commands ar...read more
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Q2. Write the code for with explain 8 bit and 4bit of clcd
Ans. 
Code for interfacing 8-bit and 4-bit CLCD with an embedded system.
• For 8-bit CLCD, use all 8 data lines (D0-D7) to send data to the display.

• For 4-bit CLCD, use only 4 data lines (D4-D7) to send data in two 4-bit nibbles.

• Ensure proper initialization and configuration of the CLCD controller in the code.

• Example: For 8-bit CLCD - send data using PORTA in AVR microcontroller. For 4-bit CLCD - send data using lower nibble of
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Q3. What is interrupt
Ans. 
An interrupt is a signal sent to the processor to temporarily suspend the current program and execute a specific task.
• Interrupts are used to handle time-sensitive tasks or events in real-time systems.

• There are different types of interrupts such as hardware interrupts, software interrupts, and external interrupts.

• Examples of interrupts include timer interrupts, keyboard interrupts, and communication interrupts.

• Interrupt...read more
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Q4. What is latency
Ans. 
Latency is the delay between the input and output of a system, often measured in milliseconds.
• Latency can be caused by processing delays, network congestion, or hardware limitations.

• Examples of latency include the delay between pressing a key on a keyboard and seeing the character appear on the screen.

• In embedded systems, latency can impact real-time performance and responsiveness.
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Explain the clcd 8 bit and 4 bit