i2ctemp schematic

Vcc

Power: AC 8-12V or DC 7.5-16V

U1

1 2		N	100uF 1	IN	OUT
		W	U	GND
		l	78L05 ^2		7805

-1- NI -1-

T

10uF

Vcc

5

10K

*

5V 2

1uF

R3

CONN4

SCL

RTS=7

4k7

Vcc

5VtL

CD=1

SDA

Vcc

DTR=4

GND=5

4k7

R1

DB9 female

u

5v1

5v1

1K

D1

11

12

13

AA

ATMEGA8	U2
Rst(PC6)	(SCL) PC 5
PDO(RXD)	(SDA)PC4
PD1 (TXD)	(ADC3) PC3
PD2 (INTO)	(ADC2) PC2
PD3 (INT1)	(ADC1)PC1
PD4 (TO)	(ADCO) PCO
Vcc	AGND
GND	AREF
_i | CD 0.	AVcc
PB7(XTAL2)	(SCK) PB5
PD5 (T1)	(MISO) PB4
PD6 (AlNO)	(MOSI) PB3
PD7 (AlN1	(OC1B) PB2
PB0(ICP1)	(OC1A) PB1

28

27

26

25

24

23

_22_

19

16

15

2L

ilr

17

JT

CONN3

4K7 at 25

vcc 10K

'k

_BZ

Vcc 10K

'k

łrc

R8

NTC ou

Je

R5 NTC in dc or

4K7 at 25

47nF or 0.1 uF

Vcc

C4

CD

O

CL

CL

CONN1

—cuntrast—uv 470 R9

I2C thermomether, (c) Guido Socher

Vcc 5V

/T\

R10

il

:I6

:I5

:I4

iw

rs

v'CC

:or

gnd

O

o

LCD