I need some electrical help with a night rocket snitch with LEDs.
Video: https://imageshack.us/clip/my-videos/836/f8a.mp4/
Parts list:
There are 12x 5mm RGB LEDs
Forward Voltage (V) : 3.5
Forward Current (mA): 20
There are 6x 3mm super white LEDs
Forward Voltage 3.5V
Current Rating 20mA
Reverse Voltage (V) 5
Continuous forward current(mA) 20
Peak forward Current(mA) 40
Power Dissipation (mW) 100
There are 2x 2032 3V batteries
CR2032 Voltage 3V
Norminal capacity 230mAh
Norminal current 0.1
Each led is run parallel to the voltage source. Batteries are run in parallel. Anode of each led is conntected to + and each cathode to -
They are wired WITHOUT RESISTORS currently.
I did buy 150Ohm restors per https://led.linear1.org/led.wiz. if I need them.
This is the info I got from that site...
Solution 0: 1 x 18 array uses 18 LEDs exactly
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
The wizard says: In solution 0:
each 150 ohm resistor dissipates 60 mW
the wizard thinks ¼W resistors are fine for your application
together, all resistors dissipate 1080 mW
together, the diodes dissipate 1260 mW
total power dissipated by the array is 2340 mW
the array draws current of 360 mA from the source.
Problem:
I didn't use the resistors because in my test breadboard the LEDs were doing the same thing (white LEDs would dim/go off due to voltage and or current needs of the RGB leds. (You can tell when LEDs are solid red and not in 'blinking mode' the white leds dim and pretty much go off for a fraction of a second. When a lot of the LEDs are in 'blink mode' there is less voltage/current to drive them and the white LEDs are bright.
Solution Needed:
Is there anything I can do without having to add more/larger batteries to keep the white LEDs from dimming in my circuit?
Thanks, Mark
Video: https://imageshack.us/clip/my-videos/836/f8a.mp4/
Parts list:
There are 12x 5mm RGB LEDs
Forward Voltage (V) : 3.5
Forward Current (mA): 20
There are 6x 3mm super white LEDs
Forward Voltage 3.5V
Current Rating 20mA
Reverse Voltage (V) 5
Continuous forward current(mA) 20
Peak forward Current(mA) 40
Power Dissipation (mW) 100
There are 2x 2032 3V batteries
CR2032 Voltage 3V
Norminal capacity 230mAh
Norminal current 0.1
Each led is run parallel to the voltage source. Batteries are run in parallel. Anode of each led is conntected to + and each cathode to -
They are wired WITHOUT RESISTORS currently.
I did buy 150Ohm restors per https://led.linear1.org/led.wiz. if I need them.
This is the info I got from that site...
Solution 0: 1 x 18 array uses 18 LEDs exactly
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
+----|>|---/\/\/---- - R = 150 ohms
The wizard says: In solution 0:
each 150 ohm resistor dissipates 60 mW
the wizard thinks ¼W resistors are fine for your application
together, all resistors dissipate 1080 mW
together, the diodes dissipate 1260 mW
total power dissipated by the array is 2340 mW
the array draws current of 360 mA from the source.
Problem:
I didn't use the resistors because in my test breadboard the LEDs were doing the same thing (white LEDs would dim/go off due to voltage and or current needs of the RGB leds. (You can tell when LEDs are solid red and not in 'blinking mode' the white leds dim and pretty much go off for a fraction of a second. When a lot of the LEDs are in 'blink mode' there is less voltage/current to drive them and the white LEDs are bright.
Solution Needed:
Is there anything I can do without having to add more/larger batteries to keep the white LEDs from dimming in my circuit?
Thanks, Mark