Power LED from 3.3V Power Pin without ResistorLED resistor questionWiring RGB LED'sbattery power for RPI and IR LED bank?PWM-based controlling an LED-strip using transistors, circuitry problemsTurn TouchScreen Backlight Off after ShutdownUsing jumper cables to turn on LEDsRaspberry PI + DS1820 + Led. Resistor confusion (series or parallel?)Control 5m of WS2812 LED Strip: Wire it uphelp reconstructing blinking LED circuit that required GPIO #17 pin low rather than highProblem with LED blink program on PiPowering a sensor using an external power supply board
How do you center multiple equations that have multiple steps?
Is it appropriate to refer to God as "It"?
What word means "to make something obsolete"?
When and why did journal article titles become descriptive, rather than creatively allusive?
Why debootstrap can only run as root?
Does hiding behind 5-ft-wide cover give full cover?
Selecting a secure PIN for building access
Why do freehub and cassette have only one position that matches?
Why do computer-science majors learn calculus?
How long can a 35mm film be used/stored before it starts to lose its quality after expiry?
Was Hulk present at this event?
Why is Thanos so tough at the beginning of "Avengers: Endgame"?
Airbnb - host wants to reduce rooms, can we get refund?
How did Arya manage to disguise herself?
Is Cola "probably the best-known" Latin word in the world? If not, which might it be?
Was the ancestor of SCSI, the SASI protocol, nothing more than a draft?
What happened to Ghost?
How to get SEEK accessing converted ID via view
How to assert on pagereference where the endpoint of pagereference is predefined
Change active object through scripting
What are the spoon bit of a spoon and fork bit of a fork called?
What does air vanishing on contact sound like?
Unexpected email from Yorkshire Bank
Can I use 1000v rectifier diodes instead of 600v rectifier diodes?
Power LED from 3.3V Power Pin without Resistor
LED resistor questionWiring RGB LED'sbattery power for RPI and IR LED bank?PWM-based controlling an LED-strip using transistors, circuitry problemsTurn TouchScreen Backlight Off after ShutdownUsing jumper cables to turn on LEDsRaspberry PI + DS1820 + Led. Resistor confusion (series or parallel?)Control 5m of WS2812 LED Strip: Wire it uphelp reconstructing blinking LED circuit that required GPIO #17 pin low rather than highProblem with LED blink program on PiPowering a sensor using an external power supply board
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
I tried wiring one white LED to the 3.3V pin on a Pi Zero W with a 330 Ohm resistor but it's not as bright as I would like. If I wire it up without a resister I get a good amount of brightness. Is that a viable solution? Or should I try a smaller resistor?
If it matters, the power supply is a standard 5V 2.5A supply like this one. The LED is this one.
power led
asked 1 hour ago
MichaelMichael
1504
add a comment |
I tried wiring one white LED to the 3.3V pin on a Pi Zero W with a 330 Ohm resistor but it's not as bright as I would like. If I wire it up without a resister I get a good amount of brightness. Is that a viable solution? Or should I try a smaller resistor?
If it matters, the power supply is a standard 5V 2.5A supply like this one. The LED is this one.
power led
asked 1 hour ago
MichaelMichael
1504
1
I'd recommend 10Ohm resistor
– Jaromanda X
1 hour ago
add a comment |
I tried wiring one white LED to the 3.3V pin on a Pi Zero W with a 330 Ohm resistor but it's not as bright as I would like. If I wire it up without a resister I get a good amount of brightness. Is that a viable solution? Or should I try a smaller resistor?
If it matters, the power supply is a standard 5V 2.5A supply like this one. The LED is this one.
power led
asked 1 hour ago
MichaelMichael
1504
I tried wiring one white LED to the 3.3V pin on a Pi Zero W with a 330 Ohm resistor but it's not as bright as I would like. If I wire it up without a resister I get a good amount of brightness. Is that a viable solution? Or should I try a smaller resistor?
If it matters, the power supply is a standard 5V 2.5A supply like this one. The LED is this one.
power led
power led
asked 1 hour ago
MichaelMichael
1504
asked 1 hour ago
MichaelMichael
1504
asked 1 hour ago
MichaelMichael
1504
asked 1 hour ago
MichaelMichael
1504
asked 1 hour ago
MichaelMichael
1504
1504
1
I'd recommend 10Ohm resistor
– Jaromanda X
1 hour ago
add a comment |
1
I'd recommend 10Ohm resistor
– Jaromanda X
1 hour ago
1
1
I'd recommend 10Ohm resistor
– Jaromanda X
1 hour ago
I'd recommend 10Ohm resistor
– Jaromanda X
1 hour ago
add a comment |
1 Answer
1
active
oldest
votes
You need to consider that the forward voltage of a white LED is likely in the range of 3.0 V to 3.2 V (according to the linked article). Assuming the best case of 3.0 V and a resistor of 330 Ohms and using Ohm's law R = U / I we find that the current is about 1 mA and thus the brightness of the LED is rather low. Decreasing the resistor will help to some degree but be aware that this is borderline in any case. Say 33 Ohms will get you about 10 mA which might be ok. Best bet is to use the 5 V instead and design the resistor in such a fashion that the current suits the safe operational range of the LED.
Connecting a LED to a voltage source without a current limiting resistor is not a safe way of operating a LED. It is therefore not advisable to do so.
Find a more elaborate description of the calculations here; even though it is aiming at GPIO pins the physics still apply.
answered 1 hour ago
Ghanima♦Ghanima
12.6k114080
Great input - thanks so much!
– Michael
56 mins ago
add a comment |
Your Answer
StackExchange.ifUsing("editor", function ()
return StackExchange.using("schematics", function ()
StackExchange.schematics.init();
);
, "cicuitlab");
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "447"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fraspberrypi.stackexchange.com%2fquestions%2f98051%2fpower-led-from-3-3v-power-pin-without-resistor%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You need to consider that the forward voltage of a white LED is likely in the range of 3.0 V to 3.2 V (according to the linked article). Assuming the best case of 3.0 V and a resistor of 330 Ohms and using Ohm's law R = U / I we find that the current is about 1 mA and thus the brightness of the LED is rather low. Decreasing the resistor will help to some degree but be aware that this is borderline in any case. Say 33 Ohms will get you about 10 mA which might be ok. Best bet is to use the 5 V instead and design the resistor in such a fashion that the current suits the safe operational range of the LED.
Connecting a LED to a voltage source without a current limiting resistor is not a safe way of operating a LED. It is therefore not advisable to do so.
Find a more elaborate description of the calculations here; even though it is aiming at GPIO pins the physics still apply.
answered 1 hour ago
Ghanima♦Ghanima
12.6k114080
Great input - thanks so much!
– Michael
56 mins ago
add a comment |
You need to consider that the forward voltage of a white LED is likely in the range of 3.0 V to 3.2 V (according to the linked article). Assuming the best case of 3.0 V and a resistor of 330 Ohms and using Ohm's law R = U / I we find that the current is about 1 mA and thus the brightness of the LED is rather low. Decreasing the resistor will help to some degree but be aware that this is borderline in any case. Say 33 Ohms will get you about 10 mA which might be ok. Best bet is to use the 5 V instead and design the resistor in such a fashion that the current suits the safe operational range of the LED.
Connecting a LED to a voltage source without a current limiting resistor is not a safe way of operating a LED. It is therefore not advisable to do so.
Find a more elaborate description of the calculations here; even though it is aiming at GPIO pins the physics still apply.
answered 1 hour ago
Ghanima♦Ghanima
12.6k114080
Great input - thanks so much!
– Michael
56 mins ago
add a comment |
You need to consider that the forward voltage of a white LED is likely in the range of 3.0 V to 3.2 V (according to the linked article). Assuming the best case of 3.0 V and a resistor of 330 Ohms and using Ohm's law R = U / I we find that the current is about 1 mA and thus the brightness of the LED is rather low. Decreasing the resistor will help to some degree but be aware that this is borderline in any case. Say 33 Ohms will get you about 10 mA which might be ok. Best bet is to use the 5 V instead and design the resistor in such a fashion that the current suits the safe operational range of the LED.
Connecting a LED to a voltage source without a current limiting resistor is not a safe way of operating a LED. It is therefore not advisable to do so.
Find a more elaborate description of the calculations here; even though it is aiming at GPIO pins the physics still apply.
answered 1 hour ago
Ghanima♦Ghanima
12.6k114080
You need to consider that the forward voltage of a white LED is likely in the range of 3.0 V to 3.2 V (according to the linked article). Assuming the best case of 3.0 V and a resistor of 330 Ohms and using Ohm's law R = U / I we find that the current is about 1 mA and thus the brightness of the LED is rather low. Decreasing the resistor will help to some degree but be aware that this is borderline in any case. Say 33 Ohms will get you about 10 mA which might be ok. Best bet is to use the 5 V instead and design the resistor in such a fashion that the current suits the safe operational range of the LED.
Connecting a LED to a voltage source without a current limiting resistor is not a safe way of operating a LED. It is therefore not advisable to do so.
Find a more elaborate description of the calculations here; even though it is aiming at GPIO pins the physics still apply.
answered 1 hour ago
Ghanima♦Ghanima
12.6k114080
answered 1 hour ago
Ghanima♦Ghanima
12.6k114080
answered 1 hour ago
Ghanima♦Ghanima
12.6k114080
answered 1 hour ago
Ghanima♦Ghanima
12.6k114080
12.6k114080
Great input - thanks so much!
– Michael
56 mins ago
add a comment |
Great input - thanks so much!
– Michael
56 mins ago
Great input - thanks so much!
– Michael
56 mins ago
Great input - thanks so much!
– Michael
56 mins ago
add a comment |
Thanks for contributing an answer to Raspberry Pi Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fraspberrypi.stackexchange.com%2fquestions%2f98051%2fpower-led-from-3-3v-power-pin-without-resistor%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
1
I'd recommend 10Ohm resistor
– Jaromanda X
1 hour ago