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Jim Bennett
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Update README.md
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1-getting-started/lessons/3-sensors-and-actuators/README.md

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@@ -145,7 +145,8 @@ One example is a dimmable light, such as the ones you might have in your house.
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Like with sensors, the actual IoT device works on digital signals, not analog. This means to send an analog signal, the IoT device needs a digital to analog converter (DAC), either on the IoT device directly, or on a connector board. This will convert the 0s and 1s from the IoT device to an analog voltage that the actuator can use.
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✅ What do you think happens if the IoT device sends a higher voltage than the actuator can handle? ⛔️ DO NOT test this out.
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✅ What do you think happens if the IoT device sends a higher voltage than the actuator can handle?
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⛔️ DO NOT test this out.
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#### Pulse-Width Modulation
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