ledresistorval
Using this TI BASIC program on a TI-Nspire, it will calculate the current limiting resistor value needed for an LED
Install
- Open the TI-Nspire CX CAS Student Software
- Plug your TI-Nspire into the computer
- Transfer the file "ledResistorProg.tns" to your TI-Nspire
Run
1) Push var and select ledresistorval
ledresistorval()
2) Push enter and answer the questions.
- VCC -> The input voltage going to the LED.
- Forward Voltage -> The voltage the LED allows through.
- Forward Current -> Current needed to make the LED light up!
3) Results
Input Value: 12
LED Voltage: 6.1
LED Current: .240
Resistor Value: 24.5833
Based on this example, using 12 volts with a forward voltage of 6.1 and forward current of .240mA you would need a 25 Ohms resistor.