Microprocessor and microcontroller lab internal exam questions:

1. Simulate software defined programmable Audio Frequency Oscillator for the signals sine wave, square wave, triangular wave, saw tooth wave for the frequency range of 1kHz to 20kHz. Frequency in kHz unit is given through any way of input devices and output any two signals at a time. Use a key to select two set of signals at output.

2. Simulate a temperature display unit. Assume that the temperature sensor output -125oC to + 125oC is in the form of DC voltage of the range 0 to 10V with a resolution of -----.

3. Generate an 8-bit pseudo random binary sequence (PRBS) generator and display it by LEDs.

4. Two messages are stored in program memory of two microcontrollers. Access these messages with passwords of any length and compare these two messages. Use serial communication link for the same and indicate the status by two LEDs (different colours) connected to the microcontrollers.

Comments:1. First question is awesome. Second question temp range is commercially available range. Fourth question I have added a task of message encryption/decryption.