I'm pretty sure on mine it was from the shutter jamming. When I got mine the shutter was disconnected and left open. I repaired the shutter and replaced the resistor, and it worked fine, nothing else was damaged.
I will have to investigate the reason for this!
I have now also ordered a zmpt101b board to create the feedback loop for the dimmer. Gary, you mentioned it was not possible to get a reliable RMS measurement from this. How so?
Here is the shutter on my 2000. I wonder what Gary's looks like.
Yes I abandoned that idea. It came to a point that I concluded that it needed a second microprocessor or better programming skills than mine.
Al three are different. Last picture is from my spare parts.
Maybe is a fuse for the shutter on a bad idea.Ha! Same burned resistor!
Maybe is a fuse for the shutter on a bad idea.
We figured out that we had to use some mosfets in order to control the ssr relay. It seems like the esp can not output enough amps to trigger the relay.
His idea is that the signal that's obtained from the cell is already smoothed out and ready to be used.
We are a bit puzzledHm, that doesn't make all that much de de really. An SSR typically has a logic level input; it doesn't draw any appreciable amount of current.
Thanks for that! I will check it out tomorrowDepends on the type of sensor and the associated circuitry. But yes, you can do a closed loop system on this basis. You may want to Google "PID controller"; you'll find Arduino libraries that you can simply plug your numbers into and you don't have to worry too much about the underlying math/algorithms.
Have a look at post #54
Thanks. Confirms that use of a 5V microcontroller is less complicated.
Thanks; I forgot about that one.
So it's a generic SSR40DA relay; the big question is whether there's a datasheet available. Probably not, so some measurements could be taken, although it's probably easier to just forego that and simply hook up the relay through a small signal mosfet (BSS123, 2n7000 etc.) or even a small NPN and run it off of 5V instead of the ESP's 3.3V logic level.
View attachment 386333
Yes, we will probably ditch the SSR and switch the fan using the other relay board we also installed. It can handle the load and works fine with the esp's signals.So it's a generic SSR40DA relay; the big question is whether there's a datasheet available. Probably not, so some measurements could be taken, although it's probably easier to just forego that and simply hook up the relay through a small signal mosfet (BSS123, 2n7000 etc.) or even a small NPN and run it off of 5V instead of the ESP's 3.3V logic level.
Thanks. Confirms that use of a 5V microcontroller is less complicated.
Yes, we will probably ditch the SSR and switch the fan using the other relay board we also installed. It can handle the load and works fine with the esp's signals.
The simplest replacement is a working EST1000, or a much simpler and functioning enlarger altogether.
if anyone has insights on accurate high-voltage true RMS measurement, I'd certainly be open to suggestions!
One easy and relatively say approach would be to take a small transformer (e.g. 230V to 12V), connect its primary across the lamp contacts and rectify + filter the secondary. Measure that rectified voltage, which you can scale and amplify as you desire. Personally I'd make a simple opamp-based differential amplifier with a static offset so that you only measure fluctuations that are meaningful, then scale that as needed to feed it into the ESP32's ADC. Note that the ADC on the ESP32 isn't very linear, but this will not be a major concern. Due to the filtration of the signal, there will be some delay/dampening so in your PID you'll have to prevent oscillations. That's a matter of judicious programming.
But measuring actual light output is a more sensible approach overall.
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