Raspberry Pi

1. Battery

2. HDMI Screen

3. MUX RXTX

3.1. Thermal Printer

3.2. 2D QR

3.3. Arduino

3.3.1. ADC

3.3.1.1. Pressure Sensor

3.3.2. ADC

3.3.2.1. OPA335

3.3.2.1.1. Alcohol Sensor

3.3.3. Motor driver

3.3.3.1. Pump

4. USB IIC Touch

5. Camera

6. Buttons (x3)

7. RTC