ECE 205 Lab 1

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The power supply is a 9V battery and uses a Red LED whose voltage drop is 2V. The LED recommends that the "ON" current should be 10 milliamps. a. What series resistor will give the specified LED current? b. What is the power dissipated by the resistor you selected in part a? What is the power dissipated in the LED? C.

1. For the ADC0804 used in section 1. the step size can be adjusted by setting the reference voltage on pin 9. When this pin is not connected (as shown in the figure 1 schematic), the reference voltage is the operating voltage Vcc. a) What is the step size for this default setting? b) How can we set the reference voltage on pin 9. to 4 V? c) What would be the step size after changing the reference voltage to 4 V? 2. Determine the analog input that will result in an output code of "10001110". Assume 5 V reference. Show your calculations. 3. What value of the analog input voltage would result in a digital output is 6F (hex)? Assume 4V reference. Show calculations. 4. In section, you used a 8-bit D/A converter. With a reference voltage of 5 V, what voltage does each bit represent in terms of the analog output? Show calculations. 5. For the D/A converter, if the output is 3.62 V, what is the value of the digital input? Show calculations. 6. For the D/A converter circuit shown in Figure 2,…

The purpose of the current limiting resistor in a Zener diode circuit is to _________. a. Maintain a constant current through the load resistor b. Maintain a constant voltage across the Zener diode c. Maintain a constant current through the Zener diode d. Drop the additional voltage from the power supply in order to maintain a constant voltage across the Zener diode Please answer it clearly.

Indicate which of the following statements refer to LCD displays and which refer to LED displays:   a. Emit light   b. Reflect ambient light   c. Are best for low-power applications   d. Require an AC voltage   e. Use a 7-segment arrangement to produce digits   f. Require current-limiting resistors

Build a thermostat using Arduino Uno, LCD display, temperature sensor and few LED's. Write a program in Arduino IDE which will work for the heating and cooling process. Use the temperature sensor to measure the current temperature. Display the current temperature on the LCD display. You need to use a loop for comparison of current temperature with the set temperature. LCD display should display the current and set temperature. Try to implement red and green LED’s for heater and cooler side respectively. Modify the project using the remote given in the kit. You should use the remote to change the temperature up and down the set temperature.

Explain with a simple circuit diagrams the three main methods (Flash, dual slope and SAR) for analog to digital conversion. please answer in typing format solution please

) Explain the functions of given IC function(s) with suitable example.b) Write down the formula for charging, discharging time and the frequency.

Please answer all subparts for like either dislike is ready.. Please all subparts in short..