I'm looking for help designing a circuit for dimming LEDs on a fish tank in reaction to ambient light. In this case I want to make the LEDs brighter when there is more ambient light, and this seems to be opposite of the circuit designs I have found online.
I'm a hobbyist, and no EE. I can use a soldering iron alright, but am baffled by component selection and the calculation of correct values.
Based on the LED driver's documentation, it seems like I could just connect an LDR photocell with resistance from 10K-100K Ohms, but that somehow seems too simple. For one thing, I have no way to know if the ambient light will match up with the range of the LDR.
The driver I'm using is a Mean Well HLG-100H-36B, and here's what the docuementation says about dimming (I've also attached a PDF file with the same specs in case the below text is hard to read):
Dimming Operation:
HLG-100H-36B
DIM+(Blue) DIM-(White)
-V(Black)
+V(Red)
Built-in 3 in 1 dimming function, IP67 rated. Output constant current level can be adjusted through output cable by connecting a resistance or
1 ~ 10Vdc or 10V PWM signal between DIM+ and DIM-. Please DO NOT connect "DIM-" to "-V".
Reference resistance value for output current adjustment (Typical)
Resistance value 10K 20K 30K 40K 50K 60K 70K 80K 90K 100K OPEN
Percentage of rated current 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 102%~108%
1 ~ 10V dimming function for output current adjustment (Typical)
Dimming value 1V 2V 3V 4V 5V 6V 7V 8V 9V 10V OPEN
Percentage of rated current 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 102%~108%
10V PWM signal for output current adjustment (Typical): Frequency range :100HZ ~ 3KHz
Duty value 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% OPEN
Percentage of rated current 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 102%~108%
Using the built-in dimming function on B-type model can't turn the lighting fixture totally dark. Please refer to the connection method below to achieve 0% brightness of the lighting fixture connecting to the LED power supply unit.
Thank you in advance for your help.
-Jon
I'm a hobbyist, and no EE. I can use a soldering iron alright, but am baffled by component selection and the calculation of correct values.
Based on the LED driver's documentation, it seems like I could just connect an LDR photocell with resistance from 10K-100K Ohms, but that somehow seems too simple. For one thing, I have no way to know if the ambient light will match up with the range of the LDR.
The driver I'm using is a Mean Well HLG-100H-36B, and here's what the docuementation says about dimming (I've also attached a PDF file with the same specs in case the below text is hard to read):
Dimming Operation:
HLG-100H-36B
DIM+(Blue) DIM-(White)
-V(Black)
+V(Red)
Built-in 3 in 1 dimming function, IP67 rated. Output constant current level can be adjusted through output cable by connecting a resistance or
1 ~ 10Vdc or 10V PWM signal between DIM+ and DIM-. Please DO NOT connect "DIM-" to "-V".
Reference resistance value for output current adjustment (Typical)
Resistance value 10K 20K 30K 40K 50K 60K 70K 80K 90K 100K OPEN
Percentage of rated current 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 102%~108%
1 ~ 10V dimming function for output current adjustment (Typical)
Dimming value 1V 2V 3V 4V 5V 6V 7V 8V 9V 10V OPEN
Percentage of rated current 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 102%~108%
10V PWM signal for output current adjustment (Typical): Frequency range :100HZ ~ 3KHz
Duty value 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% OPEN
Percentage of rated current 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 102%~108%
Using the built-in dimming function on B-type model can't turn the lighting fixture totally dark. Please refer to the connection method below to achieve 0% brightness of the lighting fixture connecting to the LED power supply unit.
Thank you in advance for your help.
-Jon