This is the link, datasheet is right down in this webpage
I don't want to destroy my Arduino, should i use breadboard then? Would it work..?
That's for an LDR light sensor. No laser. This sensor only draws a few mA, most of which is consumed by the onboard LEDs. Still, it's bad practice to feed it from microcontroller pins.
Use the connectors that @sterretje recommended.
If your SD card is 5V, then you can connect it and the LDR module to the Uno 5V
Anything else will need a separate powe supply
Like this, do the same for 5V
No, you can't do that.
There are 3 5V pins on an Uno. One on the lower left header, and one each on pin 2 of each ICSP header. And if you need a 4th, run a jumper from the 5V pin on the header to the unused pin 1 on the same header. Me, I wouldn't do any of that; I'd just add a solderless breadboard to the mix and have all the connection points I'd ever need.
No doubt, just the first I've seen it. Another example of pros (you guys) vs joes (me guys).
You have mentioned that you’re using a SIM800 (poor choice), but where are getting the 5V for that ?
The modem requires more current than your other devices, so it’s likely there’s plenty of current available for those smaller devices.
Ooh, good catch on the IOREF pin. I never think of that one.
I've got a Sainsmart clone that has those individual 5V and GND pins for each I/O like that RoboRED board, and I don't think I've ever had cause to use them. Seems like they ought to be useful, but it just hasn't ever worked out that way.
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