5 votes
Accepted

Why the LED heats up and fails to pass the controlling information further?

I think there are many things not entirely correct. First of all, it is a miracle that you can use that logic level shifter at all. Most people here simply ask why it does not work level translating a ...
Justme's user avatar
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3 votes

Why the LED heats up and fails to pass the controlling information further?

I mentioned bypassing DIN to DOUT on the suspect LED as an initial test, though I think your problems are more fundamental than that. Recognize that RGB LEDs draw a fair amount of current. At first ...
hacktastical's user avatar
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2 votes

Non-inverting buffer to drive LED using different power source

What you appear to want is a same-polarity buffer that can drive an LED on a different rail, using the function: GPIO LOW for LED lit. You can use a single-gate 74LVC17 buffer IC, a cheap and readily-...
TonyM's user avatar
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2 votes

Non-inverting buffer to drive LED using different power source

ADDED: THIS IS A GOOD ANSWER TO THE ORIGINAL QUESTION. It assumes that the LED is lit when the GPIO drive pin is high - as originally implied. - RM If the GPIO output is 3.3 V and the LED Vf is 2 V, ...
AnalogKid's user avatar
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2 votes

LED light bulb is flickering when switched on

So the light turns off when the LDR is illuminated. Your first problem is you have to decuple the light generated by the lamp from the LDR - you set up what's known as a hysteric oscillator - light ...
MOSFET's user avatar
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2 votes
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Modulation Bandwidth of LED

The issue is probably how you're driving the LED. They're nonlinear circuit elements, so if you try to drive them as you would a resistor by modulating voltage they don't respond linearly. Instead, ...
user1850479's user avatar
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2 votes
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How Does This Diode Affect This Circuit?

The LED is a diode which allows current to flow in one direction, but not the other as long as you don't apply enough voltage to cause breakdown in the reverse direction. When current is flowing in ...
qrk's user avatar
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1 vote
Accepted

How would I decide on the best LED intensity for TCS3200 sensor

Basics Cool project! You should know about potentiometers So, if you should really go with resistors, you'd honestly just buy an adjustable resistor, a so-called potentiometer (the ones meant for &...
Marcus Müller's user avatar
1 vote

Non-inverting buffer to drive LED using different power source

the LED is expected to light when the signal is low. Well - - - that changes everything. Still, this is possible with only one transistor because the LED Vf is greater than 5 V minus the sum of Voff (...
AnalogKid's user avatar
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1 vote

Non-inverting buffer to drive LED using different power source

ADDED: THIS IS A GOOD ANSWER TO THE ORIGINAL QUESTION. It assumes that the LED is lit when the GPIO drive pin is high - as originally implied. - RM while GPIO is 3.3V, I want to drive the LED using ...
Andy aka's user avatar
  • 457k
1 vote

Non-inverting buffer to drive LED using different power source

ADDED: THIS IS A GOOD ANSWER TO THE ORIGINAL QUESTION. It assumes that the LED is lit when the GPIO drive pin is high - as originally implied. - RM Looked through the web to find some complicated ...
Rohat Kılıç's user avatar

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