The 8 LEDs on the Explorer 16 development board to generate a Knight Rider Pattern on those LEDs. Calculations (Current/voltage/resistance/Time/Frequency/ etc.,):
Voltage: +3.3V
Resistance: 10k
current: 0.00033A
In the program, the timer I used the was: Count = 200
To generate a Knight Rider pattern on the 8 LEDs on the Explorer 16 development board, you can use a timer with a count of 200. Here are the calculations for the current, voltage, resistance, time, and frequency:
Current:
Given that the current is 0.00033A (or 330μA), this is the maximum current that each LED should draw.
Voltage:
The voltage used is +3.3V, which is the supply voltage for the LEDs. Each LED will have this voltage across it.
Resistance:
A resistance of 10kΩ (or 10,000Ω) is used to limit the current flow through each LED. This resistor is known as a current-limiting resistor.
Time:
The count of 200 indicates the number of timer ticks required to complete one iteration of the Knight Rider pattern. The actual time it takes will depend on the frequency of the timer.
Frequency:
To calculate the frequency, you need to know the period (time taken for one iteration) and the count value. Let's assume the timer has a frequency of 1 MHz (or 1,000,000 Hz) and a count of 200. The period T can be calculated as:
T = count / frequency
T = 200 / (1,000,000)
T = 0.0002 seconds
The frequency f is the inverse of the period:
f = 1 / T
f = 1 / 0.0002
f = 5000 Hz
Therefore, the timer used operates at a frequency of 5000 Hz, or 5 kHz.
These calculations can guide you in configuring the timer and setting up the pattern for the 8 LEDs on the Explorer 16 development board.
To generate a Knight Rider pattern on the 8 LEDs on the Explorer 16 development board, you can follow these steps:
1. Determine the LED connection: Check the datasheet of the board to identify how the LEDs are connected (parallel or series) and the voltage drop across each LED.
2. Calculate the LED series resistance: Assuming the LEDs are connected in parallel, calculate the required resistance by using Ohm's Law (V = IR) to ensure the desired LED current is obtained. For example, if the LED forward voltage is 2V and the desired current is 20mA (0.02A), the resistance can be calculated as (3.3V - 2V) / 0.02A = 65Ω. Choose the nearest standard resistor value, such as 68Ω.
3. Calculate the total supply resistance: Since you have a 10kΩ resistor, add it in series with the LED resistors. The total resistance will be R(total) = 10kΩ + 68Ω = 10.068kΩ.
4. Calculate the current flowing through the LEDs: With the total supply resistance and the supply voltage of 3.3V, apply Ohm's Law to calculate the current flowing through the LEDs. I = V / R = 3.3V / 10.068kΩ = 0.00033A (330μA).
5. Determine the number of LEDs that can be connected: Knowing the LED current (0.00033A) and the LED forward current, check the datasheet to make sure the selected LEDs can handle the determined current safely.
6. Calculate the timer values: Based on the Count value of 200, you need to determine the time period between LED transitions. This depends on the timer clock frequency, which is specified in the board's datasheet. Let's assume the clock frequency is 1MHz. The time period (T) in seconds can be calculated as T = (1 / Clock Frequency) * Count = (1 / 1,000,000) * 200 = 0.0002 seconds (200μs).
7. Calculate the frequency of the Knight Rider pattern: The frequency is the inverse of the time period, so the Knight Rider pattern frequency would be 1 / T = 1 / 0.0002 = 5000 Hz (or 5 kHz).
8. Set up the code to control the LED pattern: Write code to control the timing and pattern of LED transitions. This may involve toggling the LEDs on and off in a specific sequence, based on the calculated timer values and the desired pattern.
By following these steps, you should be able to generate a Knight Rider pattern on the 8 LEDs on the Explorer 16 development board.
To generate a Knight Rider pattern on the LEDs of the Explorer 16 development board, you will need to understand how to control the LEDs using the given voltage, resistance, and current values.
1. Determine the LED configuration: The Explorer 16 development board might have a specific layout for the LEDs. Identify the pin numbers or port names associated with each LED.
2. Set up the circuit: Connect the LEDs in the desired pattern using the appropriate resistors. In this case, you mentioned using a 10k resistor. Make sure to connect the anode (+) of each LED to the +3.3V power supply and the cathode (-) to the output pins of the development board.
3. Calculate current-limiting resistor value: LEDs have a forward voltage drop (typically around 2V). To protect the LEDs and ensure they operate within their specified current, a current-limiting resistor is required. Calculate the resistance needed using Ohm's Law: R = (V_supply - V_LED) / I_LED. Using the given values: R = (3.3V - 2V) / 0.00033A = 3.03kΩ. Therefore, a 3.03kΩ resistor should be used for each LED.
4. Program the microcontroller: You mentioned using a timer and setting the count value to 200. This indicates that you're likely using a timer interrupt to control the LED pattern. The exact programming details may depend on the specific microcontroller being used. However, the general idea is to toggle the output pins connected to the LEDs in a sequenced pattern, simulating the Knight Rider effect. You can use a loop with a nested if-else statement to change the LED states based on the timer count.
5. Calculate timer frequency and time: To determine the frequency of the LED pattern, you need to know the timer clock frequency and the count value. Divide the timer clock frequency by the count value to get the LED pattern frequency. If you have this information, you can provide the details, and I can help you calculate it.
Remember to always refer to the datasheet or programming manual for your specific development board and microcontroller to ensure accurate programming and connections.