The robot we created is a bartender robot that we designed to serve drinks and food in a bar. We named it Doggie4. The robot is divided into four layers. The bottom (the fourth layer) is a drive chassis, equipped with two wheels and two caster devices that allow the robot to move around the room. The third layer is the control area, hosting a robot control board, a sensor control panel and a motor control board. The second layer is a storage area, in which food and drinks can be placed. The top (the first layer) is the head of the robot, where we designed a LCD display screen to give the robot life-like emotions and interaction with customers. When the robot is working, a smiley face is displayed on the LED screen. When it reaches the set location, the LCD smiley face will change into a QR code for payment. Also, the flashing LED band around the robot has different color and rhythm option so that the Doggie4 can interact with its users.
Step 1: Materials Needed
All the parts were bought from Internet and local electronic market.
Edison Control Board x1
Edison Shield Board x1
Edison Motor Driver Board x1
Driving Motor x2
180 Degree Servo x1
Sound Box x1
LCD Screen x1
DuPont Line x1
LED Rope Light x1
Gear Motor x1
Acrylic Boards several
Eye nut x2
Several nuts of different sizes
Door Hinges x2
Double sided type Tape
3M PVC TAPE
3M dual lock tape
Glue for Acrylic Board
Step 2: Concept Design
This bartender robot is designed to transport food and drinks in a bar like setting, so there would have to be a space on the robot where food and drinks can be placed, and it should be able to move around. We did some research and found a something similar (see picture above) which can meet the requirements, and based on that, we have drawn our own design sketch (see picture above).
Step 3: Interior & Appearance Design
Combined with the design sketch, we have defined appearance design and interior space arrangement. The robot is divided into four layers. The bottom (the fourth layer) is a drive chassis, equipped with two wheels and two caster devices which allow the robot to move around the bar table. The third layer is the control area, hosting a robot control board, a sensor control panel and a motor control board. The second layer is a storage area, in which food and drinks can be placed. The top (the first layer) is the head of the robot, where we designed a LCD display screen to give the robot life-like emotions and interaction. When the robot is working, a smiley face is displayed on the LED screen. When it reaches the specified location, the LCD smiley face changes into a QR code, waiting for costumer payment. Also, the flashing LED band around the robot has different color and rhythm option so that the Doggie4 can interact smoothly with its users.
Step 4: Prototype & Iteration
Since the robot should be able to support its own weight, so we reinforce the chaises with wood in our first edition, however after we finished the set up, it turned out that it is still too heavy for the motor to work properly.
After ,we built up the second prototype in Solidworks, and sent to Makerbot for printing, we cut it into several parts to meet size constraints. However, the printouts were not as good as we expected, due to several printing errors.
Finally with the third edition, we bought some acrylic boards online, processed and glued them together in order for the robot to work.
Step 5: Component Installation
The acrylic boards worked out very well. So we drilled several holes on the boards to part there circuit through, and fixed it in a set position with crews.
Step 6: Programming
We use an Edison control board from Intel, which is compatible with all hardware devices in arduino system. This is so that we can develop and expand the related functions.Furthermore, we use a graph language software, SmartNode to program the robot. Its interface is clean, simple and easy to debug. One can directly connect to it via wireless network.
As it showed in the node diagram, press the program switch, program control modules work in several time nodes:
A: @ 0 second, setup the strings payload: “OK” and “I’m coming” to a text-to-speech voice output module;
B: @ 5 second, setup the strings direction: 0 to motor 1 and motor 2 to control the robot move straight;
C:@ 10 second, setup the strings speed: 80 to motor 2 to control the robot turn left;
D:@ 15 second,
a) . Setup the strings speed, 50 to motor 2 to control the robot move straight;
b). Input strings 101 to LCD screen to display a QR code
c). Setup the strings payload, 90 to servo to control the door open
d). Setup the strings payload, “here you are” and “please pay” to text-to-speech voice output module.
Programming website: http://www.smartnode.io/getstarted/
Step 7: Testing
We tested all functions needed, and it worked.
In total, we spent 5 weeks completing this robot. We failed in our first two versions and made different iterations to the robot. And finally in our third version, we achieved our goals. We hope you enjoy our Doggie4. Thank you for voting us.