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Electrical Design
Power Circuit
The pill dispenser is powered using a standard wall outlet, since they are very common. A Jetson Nano computer used to control the device is powered using 5V DC, so an AC/DC converter is used. The servomotors that move the suction arm are also powered using the same 5V source. The air pump requires 12V DC to run, so a second AC/DC converter is used.
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The servomotors are controlled using pulse width modulation pins on the Jetson Nano, which command the servos to turn to a specific position. The air pump only needs to be turned on and off, so it will be controlled by a transistor acting as a switch, connected to a standard GPIO pin.
Interfacing
The Jetson Nano computer is the central controller of the pill dispenser. It interfaces with other components that add additional features. As previously mentioned, the Jetson Nano controls two servomotors using PWM, and turns the air pump on and off with GPIO. To interact with the user, the computer is connected to a 5" touch screen display using HDMI and USB connections. Additional components, such as a camera to scan prescriptions and a speaker for audible reminders will also be connected with USB.
