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Home › Magazines › 2006 › July › 1-Wire Thermometer with LCD

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1-Wire Thermometer with LCD

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Published in issue 356, July 2006

1-Wire Thermometer with LCD
The present circuit is particularly intended to help the reader in the use of a PIC processor Type PIC16F84, a temperature sensor with 1-Wire protocol Type DS1820 (see), an LCD screen with 2×16 characters (HD44780 compatible) and a light sensor with an LDR that determines whether the background lighting of the LCD should be on.

Components

Relevant websites

Free downloads

Resistors

R1 = LDR (small model)

R2,R4,R6,R9= 10k

R3,R5 = 1k

R7 = 3k3

R8 = 10

P1 = 10k preset, horizontal

Capacitors

C1,C2 = 33pF

C3,C4 = 100nF

Semiconductors

T1 = BC547

IC1 = PIC16F84A-04CP (programmed, order code 060090-41)

IC2 = 4094

IC3 = DS1820, DS18S20

LCD = alphanumerical LCD, 2x16 characters, 44780-compatible

K1 = 9-way sub-D socket (female), angled, PCB mount

K2 = 3-way SIL pinheader

X1 = 4MHz quartz crystal, parr. cap. 32pF, HC49 case

5 wire links

PCB, ref. 060090-1 from The PCBShop

Click below to download a PDF copy of this article from Elektor magazine.

 

Downloads 
PDF Article (060090-UK.pdf)
10 Elektor Credits
PCB layout (060090-PCB.pdf)
10 Elektor Credits
 

Order from Elektor 
PIC16F84A-04CP, programmed
060090-41 (USD 16.70)
PCB, bare
060090-1
 

Free downloads 

060090-11.zip

Free download
Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.

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