I am trying to get more light from my IR LED. I am using the TSAL6100 http://www.vishay.com/ir-emitting-diodes/list/product-81009/
Currently I have it connected directly to one of the pins of the Teensy 3 and I wonder if I haven't just been lucky that it didn't burn the pin out, I do have a +-1k ohm resistor on it, but I used a 5 ohm resistor last night
So the questions
I read the Teensy 3 pins supply 3.3V so I have been supplying 3.3V to the LED. I am planning on running the Teensy 3 on a LifePo4 3.3V battery that can supply 20A+
Now looking at the datasheet of the LED it seems it can run at 3V max and draw 1.5A current if it is on for less than 100 us. Is this correct? So I can use the the 2N2222 transistor principle, same as when I need to run a motor at high current (http://forum.arduino.cc/index.php?topic=148611.msg1116551#msg1116551) to run the LED? According to this website http://led.linear1.org/1led.wiz if I enter the values 3.3, 3, 1000 it shows I can use a 1 ohm, 2W resistor. I will probably go double for safety. Will this blow the 2N2222 transistor? What kind of damage can I do?
This is my IR pulse code. The IR LED is only on for 8 us and then cools down for 8 us so it is well under the 100 us on time when using 1.5A. I have read some people don't even use a resistor when using this LED in their laser tag gear. They probably also use some kind of transistor or mosfet?
Sorry probably babbled more than asking
Currently I have it connected directly to one of the pins of the Teensy 3 and I wonder if I haven't just been lucky that it didn't burn the pin out, I do have a +-1k ohm resistor on it, but I used a 5 ohm resistor last night
So the questions
I read the Teensy 3 pins supply 3.3V so I have been supplying 3.3V to the LED. I am planning on running the Teensy 3 on a LifePo4 3.3V battery that can supply 20A+
Now looking at the datasheet of the LED it seems it can run at 3V max and draw 1.5A current if it is on for less than 100 us. Is this correct? So I can use the the 2N2222 transistor principle, same as when I need to run a motor at high current (http://forum.arduino.cc/index.php?topic=148611.msg1116551#msg1116551) to run the LED? According to this website http://led.linear1.org/1led.wiz if I enter the values 3.3, 3, 1000 it shows I can use a 1 ohm, 2W resistor. I will probably go double for safety. Will this blow the 2N2222 transistor? What kind of damage can I do?
This is my IR pulse code. The IR LED is only on for 8 us and then cools down for 8 us so it is well under the 100 us on time when using 1.5A. I have read some people don't even use a resistor when using this LED in their laser tag gear. They probably also use some kind of transistor or mosfet?
Code:
void IrCommons::pulseIr(unsigned int messagePart) {
byte firstWaitTime = 8;
byte secondWaitTime = 8;
unsigned int count = (messagePart / PULSE_TIME) + 0.5;
for(byte i = 0; i < count; i++) {
digitalWrite(IrSendPin, HIGH);
delayMicroseconds(firstWaitTime);
digitalWrite(IrSendPin, LOW);
delayMicroseconds(secondWaitTime);
}
}
Sorry probably babbled more than asking