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Topic: Overloading the backlight (Read 225 times) previous topic - next topic

ryancaptechu

Hi Everyone !

So I am trying to make a DHT 11/22 project that displays the temp and humidity and has a corresponding led that blinks based on temp parameters. Although I have run into a major problem during simulation the current through back light is 23.7 kA while the max is 20.0mA. I built it and it fried my sensor can someone offer any advice. I have attached a pic of the circuit.


Delta_G

Do you have a current limiting resistor for the backlight?  Do you need one?

Have you looked at that picture you posted?  Do you think that tangled mass of same colored wires helps?  Why don't you forget the fritzing for a minute, heap a pencil and paper, and make a little better drawing.  Or at least color those wires so one can see what goes to what. 
|| | ||| | || | ||  ~Woodstock

Please do not PM with technical questions or comments.  Keep Arduino stuff out on the boards where it belongs.

lastchancename

Delta_G beat me to it.
As soon as I see a Fritzy drawing I look away.
Sorry - but there are better ways to draw a schematic.
Pen & paper, Visio, Eagle CAD, AutoCAD
- almost anything else than Fritzing,.
Experienced responders have a nose for laziness, (they were beginners once)... expecting the poster to contribute to the learning experience.

jremington

Quote
I have run into a major problem during simulation the current through back light is 23.7 kA
While the current did not get that high in real life, the simulation was telling you something useful.

Grumpy_Mike

Feeding a sensor, be it humidity or temperature, into a digital input is going to do nothing.

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