Hello
I have a pir driven security light that I want to fade in over the time of 30 seconds to a minute when the pir triggers it. Right now the unit operates on 3 AAA batteries or 3.6 volts. That is the voltage going to the 15LED board. the LEDs each use 20ma. I can remove the battery pack and install the circuit I am requesting help on. I can then drive the pir circuit externally with either 6 or 12 volts. I am using a 6 volt 4.5ah lead acid battery that I can put a voltage booster on if I need 12 volts. I would rather stay with the 6 volts if possible. The fader circuit will just have an in and out from the pir to the LED board. I want the circuit to fade on and then remain at full 3.6 volt brightness until the pir removes the power. It can instantly drop to zero or fade down. I am not too good with the parts and how they work so I will need some guidance. I have been researching the 7555 and the 555 timers but all I have found are oscillators that do not stay powered up. Is there someone out there that would be willing to take the time to help me. I would greatly appreciate it. Thanks Dennis
I have a pir driven security light that I want to fade in over the time of 30 seconds to a minute when the pir triggers it. Right now the unit operates on 3 AAA batteries or 3.6 volts. That is the voltage going to the 15LED board. the LEDs each use 20ma. I can remove the battery pack and install the circuit I am requesting help on. I can then drive the pir circuit externally with either 6 or 12 volts. I am using a 6 volt 4.5ah lead acid battery that I can put a voltage booster on if I need 12 volts. I would rather stay with the 6 volts if possible. The fader circuit will just have an in and out from the pir to the LED board. I want the circuit to fade on and then remain at full 3.6 volt brightness until the pir removes the power. It can instantly drop to zero or fade down. I am not too good with the parts and how they work so I will need some guidance. I have been researching the 7555 and the 555 timers but all I have found are oscillators that do not stay powered up. Is there someone out there that would be willing to take the time to help me. I would greatly appreciate it. Thanks Dennis