There is no code, because i didnt upload it.
So i tried to use an lcd screen, and another one at once. Both of them were not i2c but when i put the second display, a minute later, i felt the screen hot. so i took it out. IT BURNT MY HAND. the pins almost melted, but it only seemed to be the A and K pins, so anyone wanna tell me whats going on here????????
Maybe your display does not include a current limiting resistor for the backlight and you need to add one externally. Try 220R or 330R.
I did use 220 ohm resistor
Wiring errors.
what kind of? what did i do wrong : (
At this point, the only person who could possibly know is you.
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@PaulRB but i already did use 220 ohm ???
We will need a schematic of you circuit in order to provide help. You can hand draw one and post a picture of it if you don’t know a drawing program. Very carefully check your actual circuit against the schematic.
What LCD display are you using. What voltage are you applying to the 220 ohm going to A?
Where is K connected?
@JohnRob
220 ohm resister is connected to 5v, and k is connected to gnd. is that correct or is it what caused it.
and one thing we all know, is that ill never use it again. it even smells BAD.
Is the 220 ohm connected to 5v and the A pin?
This shouldn't be an issue.
Possibilities are:
The likely / unlikely has no reflection on you specifically. It's just due to the fact that I've not heard of LCD's failing this way and I've heard of a lot of folks have miswiring issues.
@baconyy33
Sorry to say that, but it's becoming a tradition for your threads to ask a bunch of questions while providing very little information about the problem.
Where is you connection diagram? At least a clear photo of your project?
That diagram looks correct. Where did you find it?
Compare your actual wiring with the diagram very carefully, in order to find the mistake(s).
Also, carefully check your header pin soldering with a magnifying glass, to find bad solder joints or solder bridges between adjacent pins. Post a focused, closeup photo of it.
Do you think i have maybe accidentally swaped GND and 5V? Or is it the fact that I tried to use 2 LCDs at once (No i2cs)
I already disconnected it : /
The wiring diagram you posted shows only one LCD. You seem to be very confused, or very lazy.
So here's where I am ...
The 220 will limit current into any possible load in the LCD to the point it cannot create enough heat to make the A and K pins too hot to touch.
So we think either it was connected differently or you have an error in your physical connections and don't actually have what you think you have.
No other possible options.
I don't see a two screens on it. It is absolutely pointless to discuss an issue with connection of two LCD by a diagram with only one.
What? If you don't use I2C (even if this interface is HiGHLY recommended, for its lower pin requirements -just need a couple- and ease of connections) you need a lot of pins I don't think you have available, but I also hope (and suspect) you haven't connected both in parallel!!
buy a couple of I2C display backpacks, solder them to your current displays, and change the code to use I2C, and you're done.
