Never Thirsty DrinkMaster 8000 Stephan Zebrecky Daniel Hudepohl Brandon Davis Ryan Rhodes

Project Abstract The DrinkMaster 8000 is an automated beverage maker that interfaces wirelessly with a personal computer. It will allow users to combine instant powdered drink mixes with hot and cold water in multiple combinations. The computer interface simplifies control and will allow for recipes to be saved for later use.

PSSC – Project Specific Success Criteria 1)An ability to control the (de)activation of motors and flow of water/powder in the device. 2)An ability to view the status of the components of the device and the sensor readouts on a laptop, desktop or mobile device. 3)An ability to create drinks at a specified time using an on-board timer circuit. 4)An ability to communicate with a user via [LCD screen and a rotary pulse generator/touch screen]. 5)An ability to maintain the temperature of a holding tank.

Block Diagram – Electronics S.V Temperature Sensor (4) IR (4) and weight (3) sensors Motor x 2 (pump/mix) Main µCtrl LCD Bluetooth PC, Laptop, etc RPG Thermoelectric Peltier

Mechanical Schematic Liquid flow Powder flow Heat/Cool flow T.E. PPump Motor Reservoir Drink Powder tanks Solenoid Valve Waste Water out Low PSI Water In Drink out Mix Tank Key

Microcontroller ports Based on block diagram, require the following ports: ▫20 non-specific I/O pins  Solenoid valves, IR sensors, thermo. peltier control ▫7 A-to-D input pins  Sensors (temperature and weight)  Requires at most 8 bits of accuracy ▫2 PWM pins  Motors/pump (pump might only require a standard I/O pin)  8 Bits should be sufficient here for both. Will not require forwards/backwards operation. ▫Interface with Bluetooth module  Probably 1 SPI (depends on the module) ▫RPG/LCD interfaces (touch screen preferable?)  RPG requires 2-3 I/O pins  LCD would probably require around 2-4 I/O pins for a relatively small size. ▫Still finalizing how heating/cooling system will function  May require additional I/O pins for solenoid valves and driving another pump. ▫Debug Pins  Nice to have

Microcontroller selection More cost effective to select two cheaper microcontrollers? ▫Concerns about consistent reads of sensor data ▫Bluetooth messages interrupting normal operation ▫Failsafe device to shutoff water etc (prevent damage)  Requires quick turnaround time ▫Thoughts?

Power Supply Mechanical components needing power: ▫Solenoids require 12v rail and draw 0.5 A each ▫Selected DC motor (pump) requires 12v rail and draws 1.3 amps max ▫Thermoelectric peltier requires 12v rail and draws 6 amps (maximum) ▫DC motor (mix tank) needs to be determined. Can assume its fairly similar to the pump motor Device will almost certainly require a dedicated power supply and cooling solution ▫P ≈ (17 * 12 V * 0.5 A) + (12 V A) + (12 V * 6 A) ≈ 190 W ▫Thermoelectric peltier requires cooling as well. May be able to combine these functions ▫Will require circuit to generate +12V rail for Thermoelectric peltier. Chopper circuit functions here? ▫Need a linear regulator for 12V to 3.3 V?

Q&A

Design concerns Based on feedback from previous week: ▫Multiple microcontrollers? (addressed earlier) ▫Usage of Wi-Fi vs. Bluetooth?  Prefer for it to work without an external network  Solution using Wi-Fi: Create a network? ▫Failsafe for overflow (water + electronics causes issues)  Weight sensors causes shutdown of pumps  Bypass circuit in case of microcontroller lock up? ▫Power concerns  This will require a dedicated power supply