Transcript Presentation

Interactive LED Coffee Table
Team #27
Jekyung Choi, Li Jiang
1
Introduction
•
Detecting location and temperature of objects on the table
•
Glowing in different colors depending on the object temperature
2
Objective
•
•
Prevents users get burnt by a hot object
Decorative use:
Party
Night Light
•
•
3
System Overview
4
Hardware Overview
•
LED Driver
•
•
Power Supply
•
•
•
9V 5A AC/DC wall plug-in adaptor
5V 5A DC voltage regulator
IR Sensing
•
•
Receives command from MCU and turns up LEDs
Takes data from 64 IR and send it to MCU by selecting one by one using MUX
Thermopile op-amp unit
•
Amplifying sensor voltage and send it to MCU
5
Power Supply
•
•
9V 5A AC/DC Wall Adaptor
5V 5A Low-Dropout Voltage
Regulator
6
Power Supply: Analysis
•
•
•
•
Mean: 5.06 V
Min: 5.05 V
Max: 5.07 V
Std Dev: 4.07 mV
7
LED Panel and Driver
8
LED Driver: MOSFET
•
•
•
P-channel MOSFET
N-channel MOSFET
Anode side of RGB LED
9
LED Driver: Shift Register
•
•
8-channel
Serial-in-Parallel-out (SIPO)
LED panel row control
10
LED Driver: Constant Current Sink Driver
•
•
•
LED panel column control
One for each LED color
Cathode side of RGB LED
11
IR Sensing unit
• Six 8:1 MUX
• Two triple 2:1 MUX
• Receive 16 IR sensors
12
IR Sensing unit: Schematic
• Two 8:1 MUX
• One 2:1 MUX
• Four select bits
from MCU
13
Thermopile-Op Amp Unit
• Thermopile Sensor
• Monitoring heat above the sensor (remotely)
• Need amplifiers before sending data to MCU
• Amplifying + Shifting => Use Dual Op-Amp
14
Thermopile-Op Amp Unit: Schematic
• Schematic of op amp circuit
• Gain calculation for each op-amp
•
Non-inverting op amp:
•
•
G = 1 + (R2/ R1) = 1 + (30K/100) = 301 V/V
Voltage Shifter:
•
•
Vout = (1+R101/R100)(OUT1*R102/(R102+R103) + 1.5V*R103/(R102+R103) )
Voltage divider: 5V -> 1.5V (R2=2.66KΩ, R1=6.15KΩ)
15
Thermopile-Op Amp Unit: Data Analysis
Voltage from Sensor
OP-AMP 1 Gain
Shifter Value
Trial I: -0.43mV
447.37 V/V
+1.47V
Trial II: 1mV
317 V/V
+1.56V
Trial III: 7mV
278.5 V/V
+1.57V
16
Future Work
●
Programming to connect the sensing modules and LED modules and make them interact with
each other
●
Calibrating the temperature sensing module so that the color brightness and temperature
range is matched.
●
Programming for more LED display pattern
17