Hello AAC Forum,
Have a couple of old Arduinos which could be useful. So decided
to put together a test circuit using a 555 timer as a signal to the
Uno.
The sketch is attached but basically it says: When pin A0 is getting a signal turn pin 9 HIGH then LOW.
Then repeat at pin 10 and then pin 11.
It works great except after a few minutes the LED connected to 555 pin 3 burns out which makes the signal
to the Arduino stop and the LEDs attached to the Uno pins 9, 10, and 11 stop working. So I tried a 1500 ohm
resistor but had the same result. So a 10k resistor was substituted but although the LED seemed to last a little longer
it finally gave up the ghost.
It looks like too many amps are being pulled thru the LED.
Is there a way of preventing the LED at 555 pin 3 from burning out?
Thanks.
Allen Pitts
Dallas TX
Have a couple of old Arduinos which could be useful. So decided
to put together a test circuit using a 555 timer as a signal to the
Uno.
The sketch is attached but basically it says: When pin A0 is getting a signal turn pin 9 HIGH then LOW.
Then repeat at pin 10 and then pin 11.
It works great except after a few minutes the LED connected to 555 pin 3 burns out which makes the signal
to the Arduino stop and the LEDs attached to the Uno pins 9, 10, and 11 stop working. So I tried a 1500 ohm
resistor but had the same result. So a 10k resistor was substituted but although the LED seemed to last a little longer
it finally gave up the ghost.
It looks like too many amps are being pulled thru the LED.
Is there a way of preventing the LED at 555 pin 3 from burning out?
Thanks.
Allen Pitts
Dallas TX
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