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I have done the sugar and yeast co2 and it's a bit of a pain to control. 1 week you may be at 1500ppm and the next at 1000ppm. For photosynthesis there are the major factors, light, co2 and heat. You need to dial in and work out the weak points to find upping which will help the most. If you're...

Looks great. I popped 9 seeds on the 5th, 8 of 9 are out of the ground. The 9th is taking its sweet time. Not sure if it's the strain, never grown 7 of the 9. That last one is The Black from BC Bud Depot. Maybe it's something do to the dark strains?

If you're growing Organic in a "super soil" type, then by water to runoff you're removing good nutes. If you are growing in soil, feeding salt nutes, then water to runoff is recommended to remove the salt buildup. I grow super soil, and use compost teas mostly, and just try to water as required...

Even with no led'so hooked up, you should be getting a 0-10v swing. You should be measuring voltage between dim+ and dim-. Try hooking up and testing without the 10k resistor along with your meter so you can verify your voltage swing, and can be sure not to go below 1v that way. Also, might want...

Not sure what you have going on with that pot, but it sounds faulty. If you have another one available, I'd try it out. Even a 50k pot will give you a 60% sweep with your 10k added in. As for turning direction for dimming, you can swap legs on the pot to give you dim cw, bright ccw, or swap legs...

Do you have a multimeter? You can verify that your pot is working, making sure it goes from 0ohms to100k ohms. Your picture looks correct.

Here is the proven method, I get the same voltage as an open circuit. I decided to use a 2N3904, as it seemed to work the best. I picked it up in a 15 pack at radio shack, came with 5x 2N2222, 5x 2N3904, and 5x 2N4401. I also had some BC547BTAs, but the 2N3904 seemed to be less prone to leakage...

I had a long conversation, learning session with an electronics guru at work today. I didn't understand the whole PWM circuit as a whole. I now have a much better understanding of it. The circuit that I built, although working, isn't really correct. He agreed with me that if you already have 10V...

Also want to add that I am still using the code posted above, and fade to 0 gives me ~1V, this is great since you don't want to try to dim below 11%. It's not good for the driver.

I figured out my issue!! The build I posted works perfectly until I add my HLG to the circuit. It is adding voltage and there is nowhere for the extra voltage to go, so it just raises the entire system voltage to match. I added a resistor between Dim+ and Dim- and it works!! So to figure out...

@KrazyKappa it is my understanding that by forcing the Dim+ to Dim- circuit to open, will provide full 100%, or even slightly higher, this can also be achieved by as you stated a 100K resistance. You can use a switch or a relay to get the results you're looking for. As for my issue that I've...

Ok I just figured out what you meant... Long day bongsmilie Removing the Rb 4.7K, connecting 5V PWM directly to Base gives me a fade of ~6.5V to ~11V

Disconnect the base in CBE orientation I get a few mV, 0-350mV. Seems like its still getting something from the PWM pin a little bit. In the EBC orientation steady 3.173V. I am not sure I understand your 2nd Q, I have the base and the 5V PWM pin9 seperated, and then joined by the 4.7K Rb...

I have tried both ways, and since you suggested it, I tried that again. Same result latches ~9.6V. The data sheet from mouser was a bit confusing, on page 1 at the top, it seems to agree with your picture, bu if you look at the bottom drawing of page 5, it shows...

I am trying to make sense of the PWM setup. I am using a L7810CV, as SDS instructed along with a BC547BTA transistor and a 4.7k ohm Rb resistor. This was the only way that I could actually see a movement in the voltage from ~0 to ~9.5V using the arduino fade example code. I am somewhat new to...