10+ Skin and Scalps Clinic Interview Questions and Answers

The master with the lower address will take preference in sending data on I2C.

• The master with the lower address on the I2C bus will take preference in sending data.

• I2C arbitration is based on the address of the master, with lower addresses having higher priority.

• If two masters attempt to send data simultaneously, the one with the lower address will win the arbitration and proceed to send its data.

Mass provision devices using AWS IoT involves creating a fleet provisioning template and using AWS IoT Device Management service.

• Create a fleet provisioning template in AWS IoT console

• Use the template to provision multiple devices at once

• Utilize AWS IoT Device Management service for managing and monitoring provisioned devices

I have worked on protocols such as MQTT, CoAP, HTTP, and LoRaWAN in IoT projects.

• MQTT (Message Queuing Telemetry Transport)

• CoAP (Constrained Application Protocol)

• HTTP (Hypertext Transfer Protocol)

• LoRaWAN (Long Range Wide Area Network)

Azure IoT provides various methods for provisioning devices including manual, automatic, and zero-touch provisioning.

• Use Azure IoT Hub Device Provisioning Service for automatic provisioning

• Leverage Azure IoT Hub Device Twins for manual provisioning

• Implement zero-touch provisioning using Azure IoT Edge

I2C is a serial communication protocol used to connect multiple devices in a master-slave configuration.

• I2C uses two wires - SDA (data line) and SCL (clock line) for communication

• Devices are connected in a bus topology with a master device controlling the communication

• Each device on the bus has a unique address for identification

• Communication is initiated by the master device which sends start and stop signals

• Data is transferred in 8-bit chunks with acknowledgment from the re...read more

Structure is a data type that allows storing different data types in a single variable, while union is a data type that allows storing only one value at a time.

• Structure allows storing multiple data types in a single variable, while union allows storing only one value at a time

• In structure, each member has its own memory location, while in union all members share the same memory location

• Example: struct Person { char name[20]; int age; }; union Data { int num; float value; };

• S...read more

The volatile keyword is used in C/C++ to indicate that a variable may be changed unexpectedly by external factors.

• Used to prevent compiler optimizations that assume the variable's value will not change.

• Commonly used for variables shared between threads or accessed by interrupt service routines.

• Example: volatile int sensorValue; // variable updated by hardware interrupts

calloc and malloc are memory allocation functions in C. calloc initializes the allocated memory to zero, while malloc does not.

• calloc is used to allocate and initialize memory for an array of elements, while malloc is used to allocate memory for a single element.

• calloc takes two arguments - the number of elements and the size of each element, while malloc takes only the size of the element.

• calloc returns a pointer to the allocated memory, while malloc returns a void pointer.

• c...read more

Bitwise operations are used to manipulate individual bits in memory. Memory layout in C refers to how data is stored in memory.

• Bitwise operations include AND, OR, XOR, and NOT.

• They are often used for tasks like setting or clearing specific bits, checking if a bit is set, or toggling bits.

• Memory layout in C determines how variables are stored in memory, including their size, alignment, and order.

• It is important to understand memory layout for efficient memory usage and avoidin...read more

LTE stands for Long-Term Evolution, a standard for wireless communication in mobile networks.

• LTE is a 4G wireless communication technology

• It provides high-speed data transmission and low latency

• LTE uses OFDMA for downlink and SC-FDMA for uplink

• LTE supports multiple antennas for improved signal quality (MIMO)

• LTE Advanced (LTE-A) is an enhanced version with higher data rates and capacity