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Hello, this is Dustin from Mopbots. What
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you see in front of you is Mbots's new
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upcoming project. It is a 555
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temperature controlled fan controller. I
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have a 12volt supply coming into the
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and I am taking a measurement at what
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I'm calling the sensor node and at the
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sensor node is this thermister. Right
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now, you can see that I'm getting a
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reading of about 7.7 volts around that
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at that sensor node. And what I'm going
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to do is I'm going to add heat to this
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And we'll watch the voltage and we'll
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see it gradually drop. And at about 4
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volts or so, the fan will kick on. I'll
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remove the heat, allowing the fan to
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cool the thermister. And we'll watch the
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voltage again gradually rise. And at
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around 7.8 volts, we should see the fan
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kick off. So, let me add the heat.
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I have a heat gun here adding heat to
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the thermister. We're seeing the voltage
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drop and the fan kicks on at around 4
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volts. I'm removing the heat. The fan is
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still on cooling the thermister.
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And at about 7.8 8 volts. We should see
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And the fan has turned off. Cooling the
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sensor node enough to turn it off.
