AC TESTER - Circuit Cellar

NXP3680 1

NXP MBED Design Contest Project Number: NXP3680 Project Title: AC TESTER NXP Component: MBED LPC1768FBD100 Abstract

AC TESTER

The AC Tester is a tool for prototyping, testing, and repairing equipment that is powered off the AC line. It provides power line isolation to allow for the safe use of an oscilloscope on non isolated equipment. It provides adjustable line voltage to test proper operation at all line levels. It displays on both analog (for quick recognition) and digital (for accuracy) volt and ammeters. It also has a series connected incandescent light bulb to provide protection and indication of over-current conditions. If a repair or prototype has a high power short the series bulb will light and limit the power to the device. A variable response time solid state circuit breaker is also incorporated for safely cutting off power at any set current and response time. Peak surge current is also displayed. An optional Energy meter (E meter) is also provided for display of Watts, VA, VAR, peak voltage, RMS voltage, peak current, RMS current, and frequency. This project utilizes I2C, A/D, D/A, SPI and interrupt functions of the LPC1768. I2C is used to expand the I/O capabilities. Four SAA1064 LED controllers are used to display current, voltage, trip current, and response time. A PCA9539 is used to provide switch inputs, port outputs and key press interrupt. Another PCA9539 is used to provide a Dot Matrix LCD interface for the E Meter. A PCA9507 is used to bridge the 3.3V and 5V I2C buses. Five A/D channels are used to measure AC current, line voltage, load voltage, trip current setting, and response time setting. The D/A converter is used to set the latest high current peak value for the over-current comparator. The SPI bus is used to communicate with the ADE7753 Energy Meter. The basic current sensing is done by a Hall Effect current sensor. It is ratio metric, so it is powered by the 3.3V output of the MBED module. The output of the sensor is conditioned by a precision rectifier and op-amps to remove the sensor offset and rectify the output. Comparators generate Over-Current and Peak interrupts. For FAST response the OC comparator can directly turn off the TRIAC circuit breaker or for adjustable SLOW response the microcontroller through the A/D and interrupts control the TRIAC. The current sensor voltage is further conditioned by a filter for averaging or a Sample and Hold for peak detection before it is sent on to the processor A/D converter. The line voltage is attenuated and buffered by op-amps before being sent to the A/D converter. The Energy Meter portion uses an ADE7753 Multifunction Metering IC design for commercial Watt-Hour meters. It is a very power device with a multitude of features and functions. It provides a very accurate line frequency meter in addition to all Watt, VA, VAR, current, and voltage measurements. All of these are displayed on an I2C bus serially attached LCD display. The Energy Meter portion is optional. The processor checks to see if it is present. The firmware will ignore E meter functions if it is not plugged in. Since the E meter is meant to be optional it has its own stand alone power supply including an electroluminescent back light inverter. The ADE7753 is a 5 volt device so level translation for the I2C, SPI, and signal lines are provided.

NXP3680 2

NXP3680 3

Project Photo—Project prototype

NXP3680 4

VARIAC

MBED

METERENERGY

BREAKERCIRCUIT

ELECTRONICTRANSFORMERISOLATION

TRIP

DISPLAYDISPLAY

DISPLAYVOLTAGE

DISPLAYCURRENT

LCD DISPLAY

CURRENT TIMERESPONSE

1 2

AC Tester Block Diagram Block Diagram—The system block diagram shows the VARIAC feeding the current limiting series light bulb, electronic circuit breaker, energy meter, and outlet. The MBED LPC1768 interfaces to LCD display, energy meter, electronic circuit breaker and LED displays.

NXP3680 5

VLOAD

34

5

68

712

LS1

RELAY DPDT

LINE

ISO_NEUT

D31N4001

Q12N7002

R447K

TO E METER

R2680/.5W

L1VARIAC

12

3J2PLUG AC MALE

SW5SW DPDT

SW2

SW DPDT

R1820/.5W

SW1

10A SW/BRKR

14

23

T1

600VA

14

23

T3

600VA

14

23

T2

600VA

1 2

DS1300W

14

23

T4

600VA

SW3

SW6

SW SPDTRV2

V25S150P

NORMAL

BOOST

BYPASS 110V

SW4

220V

1 2

DS21000W

12

3

J3PLUG AC FEMALE

12

3

J4PLUG AC FEMALE

RV1V25S150P

+12V

TOECB

FRMECB

1234567

J1

HIRNG

HI RANGE

1 2V

M2 150/300VAC

1 2AM1

10A AC

NEUT

R36.80K/2W

C1.47UF/400V

1

2

6

54

3

7

8U1 TLP222

D21N4007

D4LED

D1LED

Schematic 1 AC power input section showing VARIAC, isolation transformer, and analog meters.

NXP3680 6

D51N4148

C9.1UF

5

8 9

7

6

35 6

R9

10K

RESET#

SW8

SW SPDT

INTOC#

TRIPPED#

TRIPPED

ONSW7

Q52N7000

Q42N7000

Q32N7000

R1147K

R1247K

R1347K

OFF

+3.3V

+3.3VOUT

IP1+1

IP2+2

IP3+3

IP4+4

IP1-5

IP2-6

IP3-7

IP4-8

FAULT_EN16

VOC15

VC

C14

FAULT13

VIOUT12

FILTER11

VZCR10

GN

D9

U2

ACS710-12

FLTR1

SLOW

FAST

FLTR2 FLTR3

Q62N7002

L3

1 UHY

L2

1 UHY

1

23

14

7

U4A74HC00

1

23

U5A 74HC00

C4.001UF

C5.001UF

C6.01UF

C7.1UF

FRMECB

C81UF

VCZR

C2.1UF

C3.01UF/400V

R5 56/2W

R8 82

R7 390R6390

Q2BTA225-800

1

2

6

4

CIRCUITCROSSZERO

U3

MOC3063

TOECB

+3.3V

ISENSE

VSENSE

PWRON#

D6LED

R1082

+3.3V

TRIPPED

TRIPPED#

RESP

Schematic 2 Hall effect current sensor and TRIAC switch for the circuit breaker.

NXP3680 7

+5VA

R15

10.0K

R19

10.0K

R14

10.0K

R20 10K

+3.3V

R21 10K

R27 10K

R28 10K

D7

1N4148

+5VA

C11.1UF

C10.1UF

+5VA

AIN

ISENSE

R183.3K

R263.3K

+5VA

-5VA

R25 20.0K

R2210.0K

R29 10.0K

9

814

312

-

+

U7C

LM339A

+3.3V

11

1013

312

-

+

U7D

LM339A

+3.3V

C14.1UF

R171K

+ C1310UF

OC SET

3

21

84

-

+

U8ALM358A

#INTOC

-5VA

#INTPEAK

ADOCSET

C12.1UF

AOUT

VCZR

R2420.0K

2

31

411

-

+

U6A

LM324

R16 330K

R23 330K

6

57

+

-

U6B

LM324

Schematic 3 Current conditioning circuit showing rectifier, midpoint voltage subtractor and amplifier, and over current and peak comparators.

NXP3680 8

INH6

VEE7 VDD

16

X14

X012

X113

Y15

Y02

Y11

Z4

Z05

Z13

A11

B10

C9

U10

4053

APSEL

R304.7K

IADC

C15.1UF

+5VA

R311M

+5V

RC14

CX15

A112

A011

Q10Q9

VDD16

RST13

U41B

4538

-5V

POLY

20 uS

0=AVG

POLY

1=PK

D8 1N4148

-5VA

C18.1UF

AIN

C16.1UF

AIN3

AOUT5

CAP6

VC

C1

VE

E4

GN

D7

SAMPLE8

U11

LF398

#INTPEAK

R3210K

C21.0022UF

C20.1UF C22

.1UF

C19.01UF

C17.1UF

D9

1N4148

+5VA

+5V-5VA

3

21

84

-

+

U9A

LM358A

Schematic 4 Current noise filter and sample and hold circuit.

NXP3680 9

D12 1N4007

D15 1N4007

C231UF/400V

C251UF/400V

C24.1UF

C26.1UF

+3.3V

9

108

-

+

U6C

LM324

R35

1.0M

R34

1.0M

13

1214

+

-

U6D

LM324

R41

1.0M

R40

1.0M

R39

1.0M

R3733.2K

R33

1.0M

121:1 ATTN

R38

1.0M

FAULT

VSENSE

D111N4148

D131N4148

D141N4148

D161N4148

+3.3V

R4233.2K

VLOAD

D103.6V TVS

F1 1/2A

R43 220K DS3 NE-2H

ISO_NEUT

R36

1.0M

ADVLOAD

ADVAC

+3.3V

R441K

+ C2710UF

ADRESPTIME

TIMERESPONSE

Schematic 5 Input voltage attenuators and buffers.

NXP3680 10

SWIRQ#

MEIRQ#

INTZCROSSI#

INTZCROSSV#

TRIPPED#

HIRNG

PWRON#

BEEPER

MERESET#

+5VA

MECS#

#INTPEAK

#INTOC

EMISO

ADVAC

ADOCSET

ADRESPTIME

ADVLOAD

IADC

SDA1

SCL1

EMOSI

ESCK

AOUT

+3.3VOUT

MESAG#

MEZX

MECF

GND1

VIN2

VBAT3

NRES4

P0.9/I2STXSDA/MOSI1/MAT2.35

P0.8/I2STXWS/MISO1/MAT2.26

P0.7/I2STXCLK/SCK1/MAT2.17

P0.6/I2SRXSDA/SSEL1/MAT2.08

P0.0/CANRX1/TXD3/SDA19

P0.1/CANTX1/RXD3/SCL110

P0.18/DCD1/MOSI0/MOSI111

P0.17/CTS1/MISO0/MISO12

P0.15/TXD1/SCK0/SCK13

P0.16/RXD1/SSEL0/SSEL14

P0.23/AD0.0/I2SRXCLK/CAP3.015

P0.24/AD0.1/ISRXWS/CAP3/.116

P0.25/AD0.2/I2SRXSDA/TXD317

P0.26/AD0.3/AOUT/RXD318

P1.30/VBUS/AD0.419

P1.31/SCK1/AD0.520

DTR1/PWM1.6/P2.521

DSR1/PWM1.5/P2.422

DCD1/PWM1.4/P2.323

CTS1/PWM1.3/P2.224

RXD1/PWM1.2/P2.125

RXD1/PWM1.1/P2.026

MAT3.1/SCL2/RXD2/P0.1127

MAT3.0/SDA2/TXD2/P0.1028

CAP2.1/CANTX2/I2SRXWS/P0.529

CAP2.0/CANRX2/I2SRXCLK/P0.430

USBD+31

USBD-32

TXD+33

TXD-34

RXD+35

RXD-36

IF+37

IF-38

5VOUT39

3.3VOUT40

U13

mbed_LPC1768

Schematic 6 MBED Processor connections.

12345

J5

C29.1UF

A10 B9 C1 D4 E3 F6 G5 DP2

DG

18

DG

27

DP1 DP2

U14NFD-5261

A10 B9 C1 D4 E3 F6 G5 DP2

DG

18

DG

27

DP1 DP2

U15NFD-5261

C30.0027UF

ADR 70/71

+ C2810UF/16V

P110P29P38P47P56P65P74P83

P915P1016P1117P1218P1319P1420P1521P1622

SDA23

SCL24

MX214

MX111

GN

D12

VC

C13

ADR1

CEXT2

U16

SAA1064

Q72SD965

Q82SD965

Schematic 7 AC Voltage LED display.

NXP3680 11

I2C IN

C32.1UF

A10 B9 C1 D4 E3 F6 G5 DP2

DG

18

DG

27

DP1 DP2

U17NFD-5261

A10 B9 C1 D4 E3 F6 G5 DP2

DG

18

DG

27

DP1 DP2

U18NFD-5261

C33.0027UF

ADR 72/73

12345

J6

Q92SD965

Q102SD965

+ C3110UF/16V

P110P29P38P47P56P65P74P83

P915P1016P1117P1218P1319P1420P1521P1622

SDA23

SCL24

MX214

MX111

GN

D1

2V

CC

13

ADR1

CEXT2

U19

SAA1064

R461.8K

R453.3K

Schematic 8 AC Current Display

NXP3680 12

Q112SD965

Q122SD965

C36.0027UF

ADR 74/75

P110P29P38P47P56P65P74P83

P915P1016P1117P1218P1319P1420P1521P1622

SDA23

SCL24

MX214

MX111

GN

D12

VC

C13

ADR1

CEXT2

U22

SAA1064

R483.3K

R471.8K

12345

J7

+ C3410UF/16V

C35.1UF

A10 B9 C1 D4 E3 F6 G5 DP2

DG

18

DG

27

DP1 DP2

U20NFD-5261

A10 B9 C1 D4 E3 F6 G5 DP2

DG

18

DG

27

DP1 DP2

U21NFD-5261

Schematic 9 Response Time or AC Load Voltage display.

NXP3680 13

Q14

Q132SD965

2SD965

C39.0027UF

ADR 76/77

P110P29P38P47P56P65P74P83

P915P1016P1117P1218P1319P1420P1521P1622

SDA23

SCL24

MX214

MX111

GN

D12

VC

C13

ADR1

CEXT2

U25

SAA1064

C38.1UF

A10 B9 C1 D4 E3 F6 G5 DP2

DG

18

DG

27

DP1 DP2

U23NFD-5261

A10 B9 C1 D4 E3 F6 G5 DP2

DG

18

DG

27

DP1 DP2

U24NFD-5261

12345

J8

+ C3710UF/16V

Schematic 10 Trip Current or Peak Current display.

P004

P015

P026

P037

P048

P059

P0610

P0711

P1013

P1114

P1215

P1316

P1417

P1518

P1619

P1720

INT1

A021

A12

RST3

SDA23

SCL22

GN

D12

VC

C24U26

PCA9539

FLTR1

SW15

F2

SW16

F1

SW18

I SET

FLTR2

SW19

RESET

FLTR3

RESET#

R531K

SW17

RESET PEAK

R49330

C40.1UF

R50330

+3.3V

R51330

R52330

D17LED

D19LED

12 3 4 5 6 7 8

R544.7K D20

LEDD18LED

12 3 4 5 6 7 8

R554.7K

AVG/PEAK

RESPSDA1

SCL1

SWIRQ#

EPRSNT#

ADR E8/E9

APSEL

SW14

F3

SW13

F4

SW11

AVG/PEAK

SW10

SILENT

SW9

RESP TIME/V OUT

VOUTTIMERESPPEAKAVG

Schematic 11 Switches and push buttons.

NXP3680 14

ACV

IADC

INTZCROSSV#

INTZCROSSI#

SDA5V

SCL5V

R603.3K

R61 1M

R66 1M

R64 1M

R70 1M

-5VA

TO E METER+3.3V

R581K

R591K

R57680

R56680

C42.1UF

C41.1UF

+5V

VC

CA

1

SCLA2

SDAA3

GN

D4

EN5

SDAB6

SCLB7

VC

CB

8 U27

PCA9507

+3.3V

SCL1

SDA112345

J10

7

61

312

-

+

U7A

LM339

5

42

312

-

+

U7B

LM339

R6510K

R6910K

R623.3K

R673.3K

R63 10K

R68 10K

+5VA

+5VA

13579

111315

246810121416

J9

+3.3V

EMOSIESCK

MEREST#MECS#

+3.3V

EPRSNT#

MEIRQ#

EMISO

MEZXMESAG#

MECF

+3.3V

Schematic 12 I2C level translation and zero crossing detectors.

NXP3680 15

COMMON POINT GROUND

ACV

VCC6

CO

LD

RV

8

SW

CO

L1

ISE

N7

GN

D4

CT

3

SW2

CO

MP

IN5

U29

MC34063

+ C50100UF/16V

+ C54100UF/16V

R71.075/2W

8

76

5

4

32

1T5

DST-7-16

R741.2K

R72330/1W

R733.6K

C46560PF

L4

100UHY

LINE

D22SB540 + C44

100UF/16V

D23P1.5KE6.8

NEUT

Q1627P06

C43.1UF

D

S

G

+ C511500UF/25V

+ C55330UF/25V

IN2

OUT3

GN

D1

U32 79L05

IN1

OUT3

GN

D2

U30

78M05

GN

D1

OUT2

IN3

U31

78M33

C49.1UF

C53.1UF

C57.1UF

C56.1UF

D25 1N5402

+12V

C48.1UF

C52.1UF

D29 1N4002

D271N4002

+ C474700UF/25V

D281N4002

D26 1N4002

D30 1N5402

+ C45

2200UF/25V

D2115V

+5V

+5VA

+ C58100UF/16V

+3.3V

D24 1N4002

-5VA

D31 1N4002

Schematic 13 Power Supply

NXP3680 16

SDA5V

SCL5V

+ C59470UF/25V

+ C61100UF/16V

D321N4002

BEEPER

R7747K

Q182N7000

LS2

BEEPER

+5V

SDA1

SCL2

OS3

GN

D4

A25

A16

A07

VD

D8U33

LM75

Q17TIP30

R75100

R761K

+5V

+12V

C60.1UF

12

J11

CON2

THERMALLY ATTACH TO TRIAC HEATSINK

FAN

ADR 0x90

Schematic 14 Fan control and beeper.

NXP3680 17

FROM CTRLR

13579

111315

246810121416

J12

+3.3V

B to AA to B

A13 A24 A35 A46 A57 A68 A79 A8

10

B121B220B319B418B517B616B715B814

GN

D1

11

GN

D2

12

GN

D3

13

VC

CA

1

VC

CB

124

VC

CB

223

DIR2

OE22

U34

74LVC4245

A13 A24 A35 A46 A57 A68 A79 A8

10

B121B220B319B418B517B616B715B814

GN

D1

11

GN

D2

12

GN

D3

13

VC

CA

1

VC

CB

124

VC

CB

223

DIR2

OE22

U35

74LVC4245

C63.1UF

C62.1UF

C64.1UF

C65.1UF

+5V+5V

EDIN

ECS#ESCLK

ERESET#

EDOUTEIRQ#ESAG#EZXECF

Schematic 15 Energy Meter level translation

I2C IN

LCDWR#

C66.1UF

+5VE

P004

P015

P026

P037

P048

P059

P0610

P0711

P1013

P1114

P1215

P1316

P1417

P1518

P1619

P1720

INT1

A021

A12

RST3

SDA23

SCL22

GN

D12

VC

C2

4

U36

PCA9539

135791113151719

2468

101214161820

J14

HEADER 10X2

D4D2D0D1

D6

+5VE

D5D3

D7

LCDD[0:7]LCDD[0:7]

R801K

+5VE

+C6710UF/16V

ELBL2

ELBL1

240 X 64 LCDHDM64GS24

110VAC 400HZ

T6963 CTRLR

Q192N3906

R78

20K

-15VE

R79

10K

Q20J176

R813.9K

LCDCE#

ADR EA

CONTRAST

LCDRD#

LCDC/D#

12345

J13

LCDRST#LCDFONTSEL

LCDD0LCDD1

Q21J176

LCDD3LCDD2

LCDD6LCDD5LCDD4

LCDD7

Schematic 16 Energy Meter LCD interface

NXP3680 18

AC IN

CURRENT XFMR

E110VLNE110VNT

V1P4

V1N5

V2P7

V2N6

RESET1

DV

DD

2

AV

DD

3A

GN

D8

REF9

DG

ND

10

CF11

ZX12

SAG13

IRQ14CLKIN

15

CLKOUT16

CS17

SCLK18

DOUT19

DIN20

U37

ADE7753

C70.1UF

1234567

J15

CON7

C69.1UF

C68.033UF

C72.033UF

C74.033UFC75.033UF

C7622PF

C7722PF

C781UF

Y13.579Mhz

EDOUT

EZX

EIRQ#

ECF

ESAG#

ESCLK

ECS#

EDIN

+ C7110UF

+

C7310UF

R83 1.0K

R85 1.0K

R8211.3

R8411.3

R881.0K

R89

1.0K

R87

499K

R86

499K

ERESET#

+5VEL5

BEAD

2

5

1

4

6

3

T6

CS2106

Schematic 17 Energy Meter metering IC.

C84.1UF

+5VE

110VAC 400 HZ

160VDC

400HZ

ELBL2

ELBL1

+ C8310UF/250V

36VAC

D361N4004

D33

1N4004

D34

1N4004

D35

1N4004

+

C80 4.7UF/250V

+C814.7UF/250V

+

C79 4.7UF/250V

+

C82 4.7UF/250V

C85

.1UF

TR2

CV5

Q3

DIS7

THR6

R4

VC

C8

GN

D1

U38

555

Q22BT149G

Q23BT149G

R903.3K

R911.8M

C86.001UF

3

6

2

5

1

4

T7

78601-16C

D371N4148

D381N4148

Schematic 18 EL Backlight power supply.

NXP3680 19

+5VE

-15VE

36VAC

IN2

OUT3

GN

D1

U40

79L15

C88.1UF

C89.1UF

C93.1UF

C92.1UF

IN1

OUT3

GN

D2

U3978M05

+

C87220UF/50V

+C9122UF/50V

D39

1N4002

D40

1N4002

8

76

5

4

32

1T8

DST-3-36

E110VLN

E110VNT

+ C9010UF/25V

+ C9410UF/25V

Schematic 19 Energy Meter power supply.

NXP3680 20

Code—The following is a sample of the code that initializes the Tester: LPC_GPIOINT->IO2IntEnF &= 0x000000; //Disable zcrs int LPC_GPIOINT->IO0IntEnF &= 0x000000; //Disable zcrs int device.format(8,1); //SPI 8 bits Mode 1 Clk, Data true, High to Low Edge device.frequency(100000); //SPI frequency 100 Khz emtr_int.fall(&emtr_handler); //Interrupts Falling Edge oc_int.fall(&oc_handler); peak_int.fall(&peak_handler); sw_int.fall(&sw_handler); tripped_int.fall(&tripped_handler); zcrsi_int.fall(&zcrsi_handler); zcrsv_int.fall(&zcrsv_handler); i2c1.frequency(100000); //set I2C interface 1 to 100 Khz LPC_GPIOINT->IO2IntEnF &= 0xFFFFC7; //Disable zcrs int beeper = 0; hi_rng = 0; pwron = 1; emtr_cs = 1; emtr_rst = 0; dac = 0.0; dac_value=0; i_value_old = 0; i2c1_data[0] = 0x00; //Zero Displays i2c1_data[1] = 0xF7; i2c1_data[2] = 0x3F; i2c1_data[3] = 0xBF; i2c1_data[4] = 0x00; i2c1_data[5] = 0x00; i2c1.write(0x70,i2c1_data,6); //AC VOLTAGE i2c1.write(0x72,i2c1_data,6); //AC CURRENT i2c1.write(0x74,i2c1_data,6); //TRIP CURRENT i2c1.write(0x76,i2c1_data,6); //RESPONSE TIME/V OUT i2c1_data[0] = 0x06; //I/O PCA9539 Command 6 Configuration Port 0 i2c1_data[1] = 0x17; //I/O PCA9539 Configuration Port 0 OUTPUT 3,5-7 i2c1.write(0xE8,i2c1_data,2); i2c1_data[0] = 0x07; //I/O PCA9539 Command 7 Configuration Port 1 i2c1_data[1] = 0xFF; //I/O PCA9539 Configuration Port 1 INPUTS i2c1.write(0xE8,i2c1_data,2); i2c1_data[0] = 0x00; //I/O PCA9539 Command 0 WRITE Port 0 i2c1_data[1] = 0x00; //I/O PCA9539 0x00 Clear Filter Bits i2c1.write(0xE8,i2c1_data,2); i2c1_data[0] = 0x00; //I/O PCA9539 Command Read Port 0 i2c1.write(0xE8,i2c1_data,1); //Read in Switches and Push buttons i2c1.read(0xE8,i2c1_data,2); sw1.switches = i2c1_data[0];

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pb1.push_buttons = i2c1_data[1]; emtr_rst=1; i2c1_data[0]=0x01; //Configuration Reg Temperature Sensor i2c1_data[1]=0x00; //Comparator Mode i2c1.write(0x90,i2c1_data,2); i2c1_data[0]=0x02; //Temp Reset Reg i2c1_data[1]=FAN_OFF; //40 C .5C/bit i2c1_data[2]=0x00; i2c1.write(0x90,i2c1_data,3); i2c1_data[0]=0x03; //Temp Trip Reg i2c1_data[1]=FAN_ON; //50 C .5C/bit i2c1_data[2]=0x00; i2c1.write(0x90,i2c1_data,3); if(sw1.switch_bits.emtr_flag==0) //IF E METER PRESENT INITIALIZE T6963 { printf("EMTR"); T6963_reset(); T6963_init(); // strcpy(msg," 1 2 3 0123456789012345678901234567890123456789"); // string_length = strlen(msg); // T6963_write_text(0,0,msg,strlen(msg)); strcpy(msg,"ENERGY METER"); T6963_write_text(14,0,msg,12); strcpy(msg,"ACTIVE ENERGY "); T6963_write_text(0,1,msg,15); strcpy(msg,"APPARENT ENERGY "); T6963_write_text(0,2,msg,17); strcpy(msg,"REACTIVE ENERGY "); T6963_write_text(0,3,msg,17); strcpy(msg,"RMS CURRENT "); T6963_write_text(0,4,msg,13); strcpy(msg,"RMS VOLTAGE "); T6963_write_text(0,5,msg,13); strcpy(msg,"PEAK CURRENT "); T6963_write_text(0,6,msg,14); strcpy(msg,"PEAK VOLTAGE "); T6963_write_text(0,7,msg,14);

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