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Circuitry
The circuitry for the Blender Splendor was not terribly complicated. We used a relay to drive both the solenoid valve and the mixing motor. The use of the relay was necessary since when we tried to power these components directly from the Handyboard they drew too much current and the Handyboard shutdown. We ran the solenoid valve with 12 volts and the mixing motor with 5 volts. We used the standard power supply and breadboard form the labs to generate these voltages. Circuit diagrams below show the set up of the relay circuit. This circuit is identical for both motors with the exception of Vin, which is 5V for the mixer and 12V for the solenoid valve.
We also used a TTL logic circuit for illuminating the error light when there is no cup in the machine or when the front door is open. This circuit lights the error light and passes the value into the Handyboard's digital input number 15 so that the program can interpret it. The diagram for this circuit is shown below.
Here's what it actually looked like:
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