Hi guys,
I have a question in regards to connecting an LED to a Microcontroller unit.
What is the best resistor value to make sure the LED is bright as much as possible.
i am not sure i am using a simple way of like
R=(Voltage from MCU - Voltage LED)/Max currentof MCU Pin.
and then divide the reslut by 2 to ensure not to reach the max condition.
but the other one which i am confused i have been given a source current for I/O pin for MCU and is asking to find the value of resistor to be connected to the LED to ensure the LED is bright.
Can any one advice me or give me a hint on how to extract the information form the graph.
Note: i have attached two pictures . 1 has the question in it and the 2nd one is the I/O soure current
Many thanks
Sam
I have a question in regards to connecting an LED to a Microcontroller unit.
What is the best resistor value to make sure the LED is bright as much as possible.
i am not sure i am using a simple way of like
R=(Voltage from MCU - Voltage LED)/Max currentof MCU Pin.
and then divide the reslut by 2 to ensure not to reach the max condition.
but the other one which i am confused i have been given a source current for I/O pin for MCU and is asking to find the value of resistor to be connected to the LED to ensure the LED is bright.
Can any one advice me or give me a hint on how to extract the information form the graph.
Note: i have attached two pictures . 1 has the question in it and the 2nd one is the I/O soure current
Many thanks
Sam
Attachments
-
112.8 KB Views: 13
-
196.3 KB Views: 10