Hey all,
Starting off with a thanks in advance!
My project is to use an arduino uno to light 2 LED strips that will be turning on based on the high voltage of my turn signals in my car. I have all the logic coded for that all to work. I am taking the Accessory power fuse (12V) and putting that through my arduino. The arduino is only powering the board itself. The LEDs are powered off a separate power supply that is taking positive/ground into a 7805 and outputting to the power for the LEDs. All grounds are conntected (car,arduino,LEDs). Data line for the LEDs connected up to the arduino.
The Problem:
(Picture attached)
The issue im having is with the 7805 getting suuuuper hot, where its causing the LED strips to pulse and change weird colors. I burnt my fingers grabbing it. That power supply is just taking the 12V from the car, passing it through the 7805 and sending the power at ~4.8 V to power the LEDs. Its worth noting that the wires going out to the LEDs are pretty long so I have a 1k ohm resistor connecting ground to data (I was having issues with the length of wire acting as an antenna and messing with the colors of the LEDs). The 4.8V is powering 2 LED strips with only 9 LEDs per strip.
Ive heard the common current draw from these is about 30mA per so in total im expecting to draw 540mA. In reality, i measured with my multimeter connecting the output of the 7805 screw terminal to each input power to the LED. Due to the different lengths of wire, one side is pulling 112mA and the other is 130mA. That puts the max current draw from the 7805 to be 242mA. The max current draw for the 7805 is 1.5 A, so why is this thing getting so hot.
Am I missing something when measuring out the current? Or know why the 7805 is getting so freaking hot?! Any idea on what other measurements I could make to get a better idea with the issues going on? Thanks again!
Starting off with a thanks in advance!
My project is to use an arduino uno to light 2 LED strips that will be turning on based on the high voltage of my turn signals in my car. I have all the logic coded for that all to work. I am taking the Accessory power fuse (12V) and putting that through my arduino. The arduino is only powering the board itself. The LEDs are powered off a separate power supply that is taking positive/ground into a 7805 and outputting to the power for the LEDs. All grounds are conntected (car,arduino,LEDs). Data line for the LEDs connected up to the arduino.
The Problem:
(Picture attached)
The issue im having is with the 7805 getting suuuuper hot, where its causing the LED strips to pulse and change weird colors. I burnt my fingers grabbing it. That power supply is just taking the 12V from the car, passing it through the 7805 and sending the power at ~4.8 V to power the LEDs. Its worth noting that the wires going out to the LEDs are pretty long so I have a 1k ohm resistor connecting ground to data (I was having issues with the length of wire acting as an antenna and messing with the colors of the LEDs). The 4.8V is powering 2 LED strips with only 9 LEDs per strip.
Ive heard the common current draw from these is about 30mA per so in total im expecting to draw 540mA. In reality, i measured with my multimeter connecting the output of the 7805 screw terminal to each input power to the LED. Due to the different lengths of wire, one side is pulling 112mA and the other is 130mA. That puts the max current draw from the 7805 to be 242mA. The max current draw for the 7805 is 1.5 A, so why is this thing getting so hot.
Am I missing something when measuring out the current? Or know why the 7805 is getting so freaking hot?! Any idea on what other measurements I could make to get a better idea with the issues going on? Thanks again!