Did you move it in any way? did you change your position? What is the target? What else could have changed? Post an annotated schematic as requested by @Railroader. The following will help us help you and give you an accurate answer.
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Provide Us Clear Documentation: Since we can’t see your project, share an annotated schematic (best) or a clear drawing of your setup. Pictures are welcome, but avoid using Fritzing diagrams as they are wiring diagrams, not schematics, and are not ideal for troubleshooting.
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Include Technical Details: If there is specific hardware involved, include links to technical information. There are often many versions of similar components, so precise details are essential. What version are you using?
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Reference Resources: For additional help, check out useful links and tutorials: Useful Links on Arduino Forum. Post links to your hardware technical information.
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Obtain a copy: of the Arduino Cookbook and complete several of the projects. Many of them will help you achieve parts of your goals.
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Course Electronics For Beginners (eBook)