Wiring: Television Device

This post outlines the wiring for the offline Amazon Alexa device for control of the television in inpatient hospital rooms. To see how this device is connected in the hospital rooms, refer to this post. 

This outlines the wiring for the offline television device using Amazon Alexa. The following design uses the parts listed in a previous post, along with a custom 3-D printed holder for inside of the project box enclosure.

The 5V (Blue Wires) and GND (White Wires) pins on the Texas Instrument board should be wired to the 5V and GND on the barrel jack input. Additionally, the 5V and GND pins on the Texas Instruments board should be wired to the 5V and GND pins on the Arduino to power the boards. The DI05 pin (Orange Wire) and DI04 pin (Yellow Wire) should be wired to the A4 and A5 pins on the Arduino, respectively. This will allow the Texas Instruments board and Arduino to communicate over I2C. 

The IR LED (Red Wire) is wired to the positive pole (5V) of the barrel jack. The other pole of the LED (Brown Wire) is connected to a 47 Ohm resistor and the D terminal of the MOSFET, which sits underneath the 3-D printed holder. The negative pole (GND) of the barrel jack (Black Wire) is wired to the S terminal of the MOSFET underneath the holder. 

The D6 pin on the Arduino (White Wire, Left) is wired to a 330 Ohm resistor and then to the G terminal of the MOSFET underneath the holder. 

The MOSFET in connected beneath the 3-D printed holder and secured using a nylon screw. The resistors are enclosed within the heat shrink tubing. The white wire travels to the G terminal (Middle) from the D6 pin on the Arduino, through a 330 Ohm Resistor. The brown wire travels to the D terminal (Right) from the IR LED through a 47 Ohm resistor. The black wire travels to the S terminal (Left) from the negative pole (GND) of the barrel jack.