The lasers (20mw green diodes)
QuoteThe lasers (20mw green diodes) Why such powerful devices?
I want to be able to see the beams. I
QuoteI want to be able to see the beams. IGet it wrong, and they could be the last things you see clearly!
so once installed it's completely safe.
All the LDRs in the original image are connected to digital inputs. I'm not sure how you would calibrate that.
I don't think the drawings is correct. You need 8 resistors in series with LDR to form a voltage dividers, than connect middle point to digital input. Probably, you could activate internal pull-up resistors for this, than LDR would be between input and ground (not +5V). The powering lasers using transformer is also not gonna work right, lasers would light up for short period of time, so your LDR would constatnly read 50/60 Hz square wave, not saying that forward peak current should be limited somehow.
I'll look into the resistors, although I doubt I will need them (check out the link above)
Also, why would the lasers not work? If the transformer turn 220v AC into 24v DC, it should work, right?
QuoteI'll look into the resistors, although I doubt I will need them (check out the link above)Not sure you are looking at the same drawing, but picture in the "Analog voltage reading method" section shows 10k resistor in series with LDR.QuoteAlso, why would the lasers not work? If the transformer turn 220v AC into 24v DC, it should work, right?Wrong, transformer outputs 24 AC, according to your drawings.