Apologies in advance for the long post - and if my questions have already been answered previously (I have read through the whole thread on numerous occasions, but there are a lot of posts & I may have missed something). I'll start with some progress updates on my own build, then into a couple of specific questions I have which relate to: orientation of the schutty diodes vs. schematic and location of PWM resistors.
Firstly, a huge thankyou to everyone that has posted in this thread - it has been a huge help to me & extremely educational. Thanks of note to @AnotherHobby
, @02Surplus (R.I.P.), & @MrMan
, who's PCB & code I'm using.
A brief intro of me: I don't have an aquarium, fish or plants, have never delved into electronics or soldered a thing in my life, and have never used an arduino. Great start huh? :P I have however coded extensively, and at the end of the day programming is programming, so expect that will be the easiest part for me. I plan on building my own aquarium to the dimensions I need (read: space I need it to fit). I'm first building my controller and LED light bar, I'll measure the light output I get and choose appropriate plants, and finally choose this fish I will stock my aquarium with - with a target of having everything up and running by the end of June. A little backwards I know, but given I'm starting everything from scratch I think it makes sense to approach it that way. Once I have the controller built & successfully tested, I plan on trying to add a PH meter, WiFi, and MQTT integration into my home automation system POC (another project I have going to learn Raspberry Pi)
Anywho, introductions over I'll give an update on my progress to date. I'm using PCB and code from @MrMan
. As a brief aside I had a minimum order quantity when I had them fabricated, so have spares if anyone wants one. I've finished (or so I thought!) soldering all the parts on, and given I've never soldered before am pretty happy with the results.
I've also got the bones of my LED light bar coming along nicely. 15 x 1W Luxeon Rebel LEDs, a mixture of 3000K, 5000K, 6500K, Red & Blue (I have the wavelengths written down somewhere, buried at the moment under a pile of electronics!)
I have a constant current driver for each of the 5 channels of lighting. Because these are fiddly little f.... things, another first for me - I designed a PCB board to mount them on that should be compatible with MrMan's PCB. Again I had a minimum order quantity for these, so when they arrive and I test it works will have some spares if anyone is interested.
And other than having sheets of acrylic and a bunch of other parts (switches, power supplies, regulators etc) ready to go to make my enclosures, that's my progress to date.
Now, onto the questions. I'll start with what I hope are the easy one's. Given the length of this post, my break my questions up into 2 more posts - power & PWM...