user48180: I recently have tried to connect an LCD to my Arduino Uno. The tutorial
tells me I need a 220 Ohm resistor, but the only ones I have are 330 Ohm. Does it matter?
Here's the Fritzing diagram by the way:


user4143: No, it doesn't matter. That resistor is just for the backlight LEDs. The larger the resistor the dimmer the backlight will be.  As @VE7JRO suggests, you can always put two 330Ω resistors in parallel, which will halve the resistance to 165Ω, which will give a brighter backlight.

48180: <p>I recently have tried to connect an LCD to my Arduino Uno. <a href="https://www.arduino.cc/en/Tutorial/HelloWorld?from=Tutorial.LiquidCrystal" rel="nofollow noreferrer">The tutorial</a>
tells me I need a 220 Ohm resistor, but the only ones I have are 330 Ohm. Does it matter?</p>

<p>Here's the Fritzing diagram by the way:</p>

<p><a href="https://i.stack.imgur.com/i3JfE.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/i3JfE.jpg" alt="enter image description here"></a></p>
 4143: <p>No, it doesn't matter. That resistor is just for the backlight LEDs. The larger the resistor the dimmer the backlight will be.  As @VE7JRO suggests, you can always put two 330Ω resistors in parallel, which will halve the resistance to 165Ω, which will give a brighter backlight.</p>
