LED won't flash with 555 timer output

I posted about this on the r/beneater subreddit but I still wanted to post here. The video file was too big to post but here is the screenshot of the scope reading from the LED. The scope is showing that the LED is receiving an output from the timer but the LED isn't flashing. Not a major issue but more of a QOL improvement.

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4 Comments

James Edens

Aug 22, 2022

I have a working astable circuit that flashes the LED with the 555. I did put my LED in backwards at first, so check that. If it is a bug, it might be something related to how the LED's are being wired. A screenshot of my circuit with 6vcc power supply for comparison.

Justin_Sanderson

Aug 23, 2022

Replying to

The positive end of the LED should be connected to Pin 3 of the timer and the negative ends need to be connected to ground right? If so I have it set properly, the Dev told me that the frame rate scaling of the LED ends up syncing with "off". Mine is based on Ben Eater's circuit .

James Edens

Aug 24, 2022

Replying to

It could be frame rate syncing. Have you tried adjusting one of the two resistors near the caps? Mine are set to do about 500ms on - 2.5 seconds off, so it's a pretty slow flash. I am using this circuit http://www.friendlywire.com/tutorials/ne555/ with modified resistor values and I added a momentary push button to simulate a reed switch.

Justin_Sanderson

Aug 29, 2022

Replying to

Thanks for the response! After some trial and error I think the issue is with the yellow LED specifically. My clock module will have a Flasing LED if I change the color to blue but it won't flash at all for

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LED won't flash with 555 timer output

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LED won't flash with 555 timer output

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