About the article

1-Wire Thermometer with LCD


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.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

R1 = LDR (small model)
R2,R4,R6,R9= 10k
R3,R5 = 1k
R7 = 3k3
R8 = 10
P1 = 10k preset, horizontal
C1,C2 = 33pF
C3,C4 = 100nF
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
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