Need really accurate time? Yes, you can use an internal timers, but it's not accurate. If you want accurate, long-term, timing, try adding a real-time clock to your next prototype for more accurate time over longer periods.
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Prototyping Supplies:
• Inexpensive Arduino Compatible Kit -- amzn.to/2Dfqs5U
• A More Deluxe Starter Kit -- amzn.to/3g9nFtR
• Jumper Wire Kit - amzn.to/3f9rtK4
• Breadboard Kit - amzn.to/3hIEPib
• Amazing Perfboard -- amzn.to/30Sj6O9
• WaveShield Kit -- amzn.to/3g9vMq6
• Motor Shield Kit -- amzn.to/3hISQfL
• Adafruit Circuit Playground Kit -- amzn.to/39yBfo9
• Makers Notebook -- amzn.to/3jHOYh3
My Camera Equipment:
• Primary Camera -- amzn.to/3fewxgA
• Camera Kit -- amzn.to/3jQvaI8
• Primary Lens -- amzn.to/3jQvaI8
• Macro Probe Lens -- amzn.to/3jQvaI8
• Main Light -- amzn.to/2X1SwB6
• Secondary (RGB) Lights -- amzn.to/3jQvaI8
• Mini Lights -- amzn.to/3jQvaI8
A few other FREE sensor tutorials you might like: (I have 100's!)
• Cellular Data shield - • Arduino Prototyping Te... z
• Capacitive Sensing - • Arduino Prototyping In...
• Luminosity Sensors - • Arduino Prototyping In...
• Thermocouples - • Arduino Prototyping In...
• Sensing Vibration - • Arduino Prototyping In...
A few other sensor tutorials you might like: (I have 100's!)
• Cellular Data shield - • Arduino Prototyping Te... z
• Capacitive Sensing - • Arduino Prototyping In...
• Luminosity Sensors - • Arduino Prototyping In...
• Thermocouples - • Arduino Prototyping In...
• Sensing Vibration - • Arduino Prototyping In...
And some playlists on prototyping with Arduino:
• The Basics - • Arduino Prototyping: T...
• Inputs - • Arduino Prototyping: I...
• Outputs - Arduino Prototyping, Techniques - • Arduino Prototyping Ba...
• Complete Prototyping Series! - • Arduino Prototyping: T...
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My company, Panoptic Labs - www.panopticlabs.com