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Thermometer using Giant Gottlieb Displays

Original, self-sufficient, and readable from a distance in all weathers

Thermometer using Giant Gottlieb Displays

In this unique project an electromechanical display recovered from a 1960s pinball machine and some modern programming techniques together form a water-temperature indicator for an outdoor swimming pool. Once the temperature is displayed on the 4 inch reels, the consumption of my circuit drops to zero, but the temperature display remains perfectly visible. There are no batteries (dry or rechargeable), adjustments, or maintenance.


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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 = 100kOhm
R2 = 470kOhm
R3,R6,R12 = 390Ohm
R4,R8,R13 = 470Ohm
R5.R9,R14 = 330Ohm
R7 = 10kOhm
R8 = 2.2kOhm
C1,C4 = 100nF (5mm)
C2 = 1000µF 35V radial
C3 = 1F 5.5V
C5 = 100nF SMD 0805
D1–D5 = 1N4148
B1 = 100Vpiv 1.5A bridge rectifier, round
IC1 = 78L05
IC2,IC4,IC6 = S2S3ADYF (triac optocoupler)
IC3 = ATTINY2313-20PU, programmed, Elektor # 110763-41
IC5 = TMP100
Tri1,Tri2,Tri3 = T1235H-6G
AC power transformer, 40VA, primary 2x115V, secondary 2x12V (e.g. Block RK40/12)
F1 = fuse, 160mAT @240V (315mAT @115 V)
K1,K4,K6,K9 = PCB screw terminal (5mm)
K2,K3 = PCB screw terminal (7.5mm)
K5 = 3-pin pinheader
K7,K8 = 4-pin pinheader
K10 = 6-pin (2x3) pin pinheader
* pushbutton, 230VAC (USA: 115VAC) rated.
PCB # 110763-1
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