About the article

LED Thermometer

Dallas sensor IC and COP8 microcontroller

LED Thermometer
The project presented here provides a novel form of temperature display. Its appearance makes it an ideal add-on to the ‘Rhine Tower Clock’ and will certainly attract attention.At the heart of the circuit is a National Semiconductor COP8782 microcontroller, as has already been used in Elektor Electronics projects like the Running Text Display (PC Topics Supplement, February 2000). The microcontroller reads temperature data from a sensor IC made by Dallas Semiconductor, which has also been seen before in Elektor Electronics projects (‘Temperature Measurements with the DS1621’ and ‘DS1621 Datasheet’, both in the March 2000 issue). A DS1621 programmer was published in the February 2001 issue.The microcontroller also has the job of displaying the measured value on 32 multiplexed LEDs.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD 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.

Component list
R1-R8,R11,R12 = 220W
R9 = 100kW
R10 = 2kW 7
C1 = 82pF
C2,C3 = 100nF
C4 = 100m F 16V radial
D1-D29 = LED, high efficiency, red
D30,D31,D32 = LED, high efficiency, yellow
D33 = 1N4148
IC1 = DS1621 (Dallas Semiconductor) (Farnell # 760-704)
IC2 = COP8782-CN, programmed, order code 000125-41
IC3,IC4 = 74HCT244
IC5 = 7805
PC1,PC2 = solder pins
PCB, order code 000125-1
Disk, COP8 source code file, order code 000125-11
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