Does the 20mA change at all with the setting (ie changing from 0 to 100%)? Can you measure the voltage at the PWM pin at 0, 50% and 100%?Thanks Fietsenrex,
Yes i have connected the ground of PSU to Arduino as i am able to control the intensity of the LED's from the controller. The issue is if i set 100% intensity on the controller it is still very low as compared to directly giving 12v to the LDD700H. This LED are Cree 3W.
I read the current on the output of LDD700, its 690mA when powering directly with12v(without PWM) and the same when i connect the controller(PWM) i get just 20mA which is way too low.
Need to know if their are any settings in the code.
You need a logic-level N-channel mosfet like the FQP30N06L, and you need to make a constant current driver with it, the following project has some methods that will work, although with poor efficiency-Love this thread, a very big salute for mr AH, realy bringin m=y arduino skill, yes i a lately on this hobby, starting the aquarium only last year ang this arsuino just now, what an inspiring project, but still got problem with LED drivers, can anyone suggest me with a lower inexpensive driver like using mosfet not the LDD, this is quite expensive to me, what kind of mosfet or any transistor or like would be use.
Thank You, sorry for late replyYou need a logic-level N-channel mosfet like the FQP30N06L, and you need to make a constant current driver with it, the following project has some methods that will work, although with poor efficiency-
High Power LED Driver Circuits: 12 Steps (with Pictures)
I'm Guillaume, a french guy that love computers, electronic, and... shrimps!
(sorry for my poor english...)
I have found this thread 2 month ago, what amazing work :icon_eek: !
While I wanted to build a similar project, I decided to try to adapt iAqua to my tank, so....
Thanks Dan Cunningham (AnotherHobby), thanks robsworld78, thanks Ryan Truss (MrAqua) and all the others contributors!
I started with the v2.5.1 of MrAqua (thanks again), this code is pretty cool! :wink2:
I've made my own shield to fit my need (do you think it looks like MrAqua's one? It's normal, I was inspired by it!):
There are 6 outputs with optocouplers for the LED PWM signals
Bottom view (with the PCA9685 SMD):
The code is working, but I have some graphic improvements to do...
Now I have to debug 2-3 things, and add new stuff to fit perfectly my needs...
Once again, THANK YOU GUYS FOR THIS WORK !!! roud:roud:roud: