Notifications
Clear all
Topic starter
2021-09-03 5:54 pm
I was going to buy some components just to have them for Arduino experimenting and was looking at LDR Photo Resistors. I watched a video on using them and pretty much understand them except for one major question. They make a bunch of different part numbers with mostly all the same specs except for the "light" and "dark" resistance. Take the seemingly more common GL5537 that has the following specs:
Maximum voltage (v-dc) : 150
Maximum power consumption (mW) : 100
Ambient temperature ( C) : - 30 - + 70
Spectral peak (nm) : 540
**Dark Resistance M:2 , 100100.7
**Bright resistance (10 lux) (K) : 18 - 50
Response time (ms) : rise: 20
Fallen: 30
My question is in easy terms, with a lower dark and bright resistance, what are the effects The ability to be used in darker and/or brighter environments like outside direct sun as opposed indoors?
Other part numbers available:
5516
5528
*5537
5539
5549
Thanks,
Voltage
2021-09-03 6:45 pm
I think it just refers to the maximum and minimum resistance of the LDR, presumably a wider range implies a better precision. But they're nonlinear devices, so the variation in resistance over light range is still pretty much relative.
Buy the cheapest ones and experiment 🙂
Anything seems possible when you don't know what you're talking about.
Topic starter
2021-09-03 7:11 pm
Ok, sounds like a plan. With some sellers they list all the different ranges (part numbers) and the price is the same. But at a glance, ebay seems to have mainly the 5537 for sale. I am also going to get some of those tri-color LED's with the common cathode to play around with. I notice however the viewing angle is only 25 degrees unless you get the diffused ones and it goes up over 150 degrees. Always something to consider. 🙂 I have been busy studying Arduino coding and watching a lot of Paul McWhorter's lessons. Great teacher. 😎
Thanks,
Voltage
2021-09-03 7:19 pm
Yeah, seems one can never stop learning about the Arduino and coding.
If you're interested in blinking lights, I'd suggest you take a look at ws2812b LEDs as well. You can get strips of them and chop 'em up or whatever. They only use 5V to operate and you can program each LED individually with its own colour and intensity, even in strings.
Anything seems possible when you don't know what you're talking about.
Topic starter
2021-09-03 7:31 pm
I already have some of those strips of LED's. Not sure if they are the ws2812b's though. 😀 They are single color. Thanks for the info and part number on those. I will add them to my grocery list. 🙂 But yeah, that Arduino is a lot of fun in a small package and the Nano is even smaller. I always think I can come up with something useful/salable but that never seems to ever happen. But it is very useful for my own projects.
Thanks,
Voltage