Interactive LED Coffee Table – Arduino Compatible

Rajkumar Sharma
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SKU: EL130660
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The project demonstrated here is an IR proximity sensor-based LED light, mainly designed for interactive coffee tables, but also can be used as single interactive light. The table can be made with multiple of these PCBs. Multiple tiles can be used as shown in the image below, each tile will light up when an object is placed over the sensor. Only the LEDs that are to the sensor area will light up. The project is Arduino compatible and consists of an ATMEGA328 chip, 16 x 5mm LEDs, ULN2803 multi-output driver for LEDs, IR Sensor, 5mm IR LED, and BC847 BJT transistor. The operating supply is 5V DC @ 200mA current.

Note 1: It is important to use an original IR LED and IR sensor from Vishay, as cheap sensors have lots of noise and cause abnormal behavior. Especially black sleeve/cover is required around the LED so IR emissions do not leak and hit the IR sensor directly.

Note 2: The user may replace the LED with green, blue, yellow, orange, or white. In this case, consider the voltage and current of LEDs, and choose the appropriate LED series resistor as per the LED datasheet.

Note 3: The project may be used for other LED light applications as well, that’s why all 8 LED groups kept independent to create multiple light effects and colors.

Note 4: Optional U4 connector provided for Analog sensor input, in case of external sensor interface is required.

Features

Supply 5V DC @ 200mA
8 x LED Groups to Create Multiple LED effects
On-Board IR LED
Sensing Distance 2 cm to 15 cm
On-Board IR Sensor
PCB Dimensions 95.98 x 95.25mm
4 x 3mm Mounting Holes

Arduino Pins and Other Connections

Arduino Analog Pin A0 Optional analog Sensor Interface Connector U4
CN1: Arduino Programming and Boot-Loader, Pin1 TX, Pin 2 RX, Pin 3 Reset, Pin 4 GND, Pin 5 VCC, Pin 6 D11, Pin 7 D12, Pin 8 D13
Arduino Digital Pin D4 = LED 8 and LED 16
Arduino Digital Pin D5 = LED 7 and LED 15
Arduino Digital Pin D6 = LED 6 and LED 14
Arduino Digital Pin D7 = LED 5 and LED 13
Arduino Digital Pin D8 = LED 4 and LED 12
Arduino Digital Pin D9 = LED 3 and LED 11
Arduino Digital Pin D10 = LED 2 and LED 10
Arduino Digital Pin D11 = LED 1 and LED 9
Arduino Digital Pin D2 IR Sensor
Arduino Digital Pin D3 IR LED
CN2: Pin 1 VCC 5V DC, Pin 2 VCC 5V DC, Pin 3 GND, Pin 4 GND

Arduino Programming

Sample Arduino code is available as a download. The ATmega328 chip generates 38Khz pulses which drive the IR LED using a BC847 transistor, IR sensor is installed close to IR LED, When an object approaches the IR light, it reflects and falls on the IR sensor. IR sensor sends the signal to the ATMEGA328 chip and it drives all the outputs high, thus all LEDs are ON and continue in the same state until the object is removed. Refer to the connection diagram for bootloader burning and programming the ATMEGA chip with help of Arduino IDE. Users may write their own code as per requirements.

Schematic

Parts List

NO	QNTY	REF	DESC	MANUFACTURER	PART NO
1	1	CN1	8 PIN MALE HEADER RIGHT ANGLE PITCH 2.54MM	WURTH	732-5321-ND
2	1	CN2	4 PIN MALE HEADER RIGHT ANGLE PITCH 2.54MM	WURTH	732-5317-ND
3	4	C1,C4,C5,C9	0.1uF/10V CERAMIC SMD SIZE 0805	YAGEO/MURATA
4	1	C2	47uF/10V CERAMIC SMD SIZE 1210	YAGEO/MURATA
5	1	C3	10uF/10V CERAMIC SMD SIZE 0805	YAGEO/MURATA
6	2	C6,C7	22PF/50V CERAMIC SMD SIZE 0805	YAGEO/MURATA
7	3	U4,C8,D17	DNP
8	16	D1 TO D16	5MM RED LED OR GREEN	SUNLED	1497-XCMDK12D-ND
9	1	D18	IR LED 5MM	KINGBRIGHT	754-2222-ND
10	1	J1	WIRE JUMPER JUMPER		WIRE JUMPER
11	1	Q1	BC847AL	NEXPERIA	1727-2924-2-ND
12	8	R1,R2,R3,R4,R5,R6,R7,R8	100E 5% SMD SIZE 0805	YAGEO/MURATA
13	2	R9,R11	10K 5% SMD SIZE 0805	YAGEO/MURATA
14	1	R10	1M 5% SMD SIZE 0805	YAGEO/MURATA
15	2	R12,R13	10E 5% SMD SIZE 0805	YAGEO/MURATA
16	1	R14	2.2K 5% SMD SIZE 0805	YAGEO/MURATA
17	1	R15	62E 5% SMD SIZE 0805	YAGEO/MURATA
18	1	U1	ATMEGA328TQPF-32	MICROCHIP	ATMEGA328PB-AURCT-ND
19	1	U2	ULN2803A	TI	ULN2803ADW-ND
20	1	U3	TSMP58138	VISHAY	TSMP58138
21	1	X1	16Mhz	ECS INC	X1103-ND