Hi, newbie here, I'll try to be descriptive yet concise!
My car has LED dashboard instrument lights, dimmable by a push button that cycles through 6 brightness levels. It remembers separate day and night settings.
I want to add a number of switches and gauges to the car that all contain LED illumination intended for a 12v circuit. I'd like to get them to follow the instrument lights, rather than use a separate dimmer.
I don't know how to interface the two circuits, or what voltage the instrument lights are running at (I assume they are being PWM, but I've just about reached the limit of my electronics ability). The instrument lights have a ULN2003A chip, and SMD LEDs that each have a 1k resistor. I've attached flyleads in parallel to an LED+resistor and my basic autoranging DMM reads the following, if it helps:
1 (max): -3.6v
2: -2.7v
3: -1.7v
4: -0.7v
5: 0.0v
6 (min): +0.8v
Thanks in advance for any guidance!
My car has LED dashboard instrument lights, dimmable by a push button that cycles through 6 brightness levels. It remembers separate day and night settings.
I want to add a number of switches and gauges to the car that all contain LED illumination intended for a 12v circuit. I'd like to get them to follow the instrument lights, rather than use a separate dimmer.
I don't know how to interface the two circuits, or what voltage the instrument lights are running at (I assume they are being PWM, but I've just about reached the limit of my electronics ability). The instrument lights have a ULN2003A chip, and SMD LEDs that each have a 1k resistor. I've attached flyleads in parallel to an LED+resistor and my basic autoranging DMM reads the following, if it helps:
1 (max): -3.6v
2: -2.7v
3: -1.7v
4: -0.7v
5: 0.0v
6 (min): +0.8v
Thanks in advance for any guidance!