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Hi guys! I am in the process of trying to cobble together a Reef-Pi controller, and I could use some help, please. I have posted in the main thread, but I feel bad adding to an already bloated read, so I'm hoping some of you will be willing to help me here.
Consider me a noob with this stuff. I do have a background in tech, but I am super rusty
Here's where I am in short:
I completed the Reef-Pi install, and am now working on my power controller build. I would prefer not to use the American DJ power strip recommended in the Reef-Pi documentation for a number of reasons. I would prefer to go with a DIY bank of regular household duplex outlets. I've done this before with other RPi projects and I am aware of and alright with the safety concerns with doing it this way.
I have soldered up my Adafruit Perma Proto HAT as per the Reef-Pi guide, and I have a 12v 8 channel relay board I'm trying to control. I'm just in my initial testing phase here. My problem is that I can create outlets in Reef-Pi 6.0, I can turn turn those outlets on and off, and I get an expected 3.3v on and off coming out of the RPi GPIO and flowing right into the legs of my ULN2803A Darlington. The problem is that I cannot get any output from the ULN2803A. I have 12v coming into pin 10 (com) of the ULN2803A. Everything on my Perma Proto Board seems to check out with visual inspection (no solder bridges) and a continuity tester. I can't figure out why everything works basically right up to the ULN2803A, and then there is no output afterwards.
An obvious thought is that my ULN2803A chip is defective, and I've ordered more that are supposed to be here tomorrow. I'm not convinced that my ULN2803A chip is faulty, but at least I can rule it out.
Could someone please help me figure out why I have expected voltage coming into the ULN2803A chip, but I get nothing on the output side?
I would very much appreciate any help here, thank you in advance for your help!
Consider me a noob with this stuff. I do have a background in tech, but I am super rusty
Here's where I am in short:
I completed the Reef-Pi install, and am now working on my power controller build. I would prefer not to use the American DJ power strip recommended in the Reef-Pi documentation for a number of reasons. I would prefer to go with a DIY bank of regular household duplex outlets. I've done this before with other RPi projects and I am aware of and alright with the safety concerns with doing it this way.
I have soldered up my Adafruit Perma Proto HAT as per the Reef-Pi guide, and I have a 12v 8 channel relay board I'm trying to control. I'm just in my initial testing phase here. My problem is that I can create outlets in Reef-Pi 6.0, I can turn turn those outlets on and off, and I get an expected 3.3v on and off coming out of the RPi GPIO and flowing right into the legs of my ULN2803A Darlington. The problem is that I cannot get any output from the ULN2803A. I have 12v coming into pin 10 (com) of the ULN2803A. Everything on my Perma Proto Board seems to check out with visual inspection (no solder bridges) and a continuity tester. I can't figure out why everything works basically right up to the ULN2803A, and then there is no output afterwards.
An obvious thought is that my ULN2803A chip is defective, and I've ordered more that are supposed to be here tomorrow. I'm not convinced that my ULN2803A chip is faulty, but at least I can rule it out.
Could someone please help me figure out why I have expected voltage coming into the ULN2803A chip, but I get nothing on the output side?
I would very much appreciate any help here, thank you in advance for your help!