18F4550 USB interfacing.

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hemnath

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I have interfaced DHT11 humidity and Temp sensor with PIC18F4550 and to display their values on PC(app developed on Visual C#).

Connections:
uC PC
+5V---->+5V
D+-----> D+
D- -----> D-
Gnd----> Gnd

When i connect +5V to DHT11, it displays USB not recognized in PC. Why is it so?
Please help.
 

Are you using the Microchip USB library? You may need to setup BUS power. The USB spec only gives a small amount of power by default. (I think 100mA.) You may be over the limit. Therefore you need to configure your device to ask for the full 500mA.

Do you have a hardware schematic?
 
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