EEVblog Electronics Community Forum
Electronics => Projects, Designs, and Technical Stuff => Topic started by: Borillion on January 09, 2021, 10:20:15 pm
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I am trying to reverse engineer the controller circuit for a LED Grow lamp that I use to grow aquarium algae as nutrient export.
Unfortunately it has an unknown controller on it but since I can measure the pin state its not too big of an issue to figure out.
On the input side it takes 5 volts from a USB cable for power, the usb power wall adapter it comes with is rated for 5v 4A; and on the output side there is what I would guess are dual voltages as the LED PCB's they connect to have red, blue and white LEDs.
These shows how the controller functions
(https://preview.redd.it/lkhld208hk961.png?width=591&format=png&auto=webp&s=13fceeb8319c32fad761f5badadef585fc4037b3)
PCB Images
Top
(https://preview.redd.it/z0ex8unzgk961.png?width=809&format=png&auto=webp&s=bf4e40ca6bac253ba2ad4696ca073963764ce0d6)
Bottom (Mirrored)
(https://preview.redd.it/33dnfl58kk961.png?width=864&format=png&auto=webp&s=5e2db3dab9e986085d1c4b7cfe50dacda65313e8)
Overlay attempt
(https://ibin.co/5nhYdA2njNqK.png)
Measuring Voltages I see that each LED Array that is lit corresponds to L1, L2 or L3 are connected to ground through Q1 and Q2
Blue Array => Black (Vcc) & Red (L2) GND
Red Array => Black (Vcc) & Green (L3) GND
White Array => Black (Vcc) & White (L1)
Blue & Red Arrays => Black (Vcc) & Green (L3) & Red (L2)
I was hoping others would be willing to act as a sanity check, as I work through this?
I am trying to figure out the connections to and around Q4 and I am a bit confused as to what I am seeing.
Do others of you map this out the same way?
(https://ibin.co/5nhWkOKegpay.jpg)
Thanks!