You need to know the forward voltage (Vf) and current requirement (A) of the LED. Then, calculate if the 1.5kΩ resistor results in enough (and not too much) current for the LED. AND as dl324 said, the LED may load the output line to the point the MCU cannot detect the output of the PIR…
This is the reason why it’ll blink fast (hyper-flash). The fix is very simple – install a RESISTOR. This will make your buddy think that it has a bulb in good condition, so it will blink in a normal state. Because our technology is very open to improvements, there are now LEDs that have built-in resistors in it.
5,934. Oct 26, 2011. #3. Then it comes to LEDs always think current not voltage. A LED can easily conduct a current that will destroy it. So you must always use some sort of method to limit the current. You may build a constant current source. But the simplest way is to use a series resistor to limit the current. Originally Posted by cb_13. Hyper flash (which the bcm does to let you know there is a turn signal bulb out) can be turned off with IDS and most likely ForScan as well. That would eliminate the need for wiring in resistors.Most likely be a programming fee at the dealership. Where I'm at we'd charge $57.50 for it. When the button is not pressed, the input pin is pulled high. The value of the pull-up resistor controls the voltage on the input pin. For condition 1, you don't want the resistor's value too low. The lower the resistance, the more power will be used when the button is hit. You generally want a large resistor value (10kΩ), but you don’t want
A series resistor of 6.5 Ω is the correct way to do this. A voltage divider will change its voltage when you add the LED in parallel with the "bottom" resistor. Keep in mind that your resistor's power is 0.28 2 ·6.5, or just over half a watt, so you will need probably a 1 W resistor to handle it comfortably and it will get warm if not hot.
The LED's Operating Voltage is 2.0 Volts (if you had more then one just add up each voltage, so 3 LED's would use 6 volts) The LED's Operating Current is 20ma (Milliamps) or 0.02 Amps We need to find out 2 things, one the Resistance value needed to drop 12 Volts to 2 Volts and the second part of the problem is the wattage rating of the resistor.
However, more often than not, a push button will require a resistor. A push button will need a resistor when it is used in conjunction with a microprocessor or microcontroller as an input. The main reason for using it is to ensure a defined state (0 or 1) is present at the micrcontroller’s input, otherwise the input could be left floating
Red,yellow leds usually need only 1.8-2V to glow depending on the led. so you need to use a resistor in series based on your brightness requirements. this forward voltage needed depends on the led. for red, I suggest around 20mA current which will give you a resistance of 50ohms.
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    • do i need a resistor for led