Article

Numitron Clock & Thermometer

Developed on the Arduino platform

Labs Project

Based on a Labs project | September 2012 | Find it here

The idea for this project was to take the Arduino world off of its Shields and Breadboards and out into a world of Elektor DIY projects while also hopefully appealing to the diehard AVR hackers. These worlds are so close but are so often treated as separate. The project happily combines today’s microcontroller technology with 1950’s Soviet tubes now available ‘NOS’ from Ebay.

This is a MEMBER ONLY article. You need a subscription to read this article.

Benefits of a subscription

Access to Elektor archive and 5,000+ Gerber files
Receive up to 8 magazines per year (digital and/or paper)
10% discount in the Elektor store

View the offers
Available from €4.95 per month.

What is Elektor Exclusive?

Materials

www.radiomuseum.org

www.elektor.com/110744

www.elektor.com/120740

www.elektor-projects.com/project/numitron-arduino-clock-and-thermometer-120740.12460.html

http://playground.arduino.cc/Code/BitMath#bitwise_and

120740-PCB.pdf

120740-11.zip

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 the Elektor PCB Service service from its business partner Eurocircuits or AISLER as the best services for its own prototypes and volume production.

The use of our Gerber files is provided under a modified Creative Commons license. Creative Commons offers authors, scientists, educators and other creatives the freedom to handle their copyright in a more free way without losing their ownership.

PCB

Download Gerber file: 120740-1.zip

Components

The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.

Download the BOM list

Component list

COMPONENT LIST
Resistors
R1 = 0.18Ohm 3W
R2,R3,R7,R8,R9 = 10kOhm
R4,R5,R6 = 4.7kOhm
P1 = 4.7kOhm preset, top adjust
Capacitors
C1,C2,C6,C7,C8,C12,C13,C14,C15,C16 = 100nF
C3 = 100µF 25V radial
C4 = 220pF
C5 = 22µF 25V radial
C9 = 10µF 50V radial
C10,C11 = 22pF
Inductors
L1 = 18uH choke, 3.4A, 0.036Ohm (Panasonic type ELC10D180E)
Semiconductors
D1 = 1N5819
IC1 = 78L05
IC2 = MC34063
IC3 = ATmega328-PU, programmed, Elektor Store # 120740-41
IC4 = DS1307
IC5,IC6,IC7,IC8 = 74LS47
IC9 = DS1820
Miscellaneous
V1,V2,V3,V4 = IV-9 Numitron tube
JP1 = 2-pin pinheader + jumper cap, 0.1’’ pitch
X1 = 32.768kHz quartz crystal
X2 = 16MHz quartz crystal
MOD1 = BOB-FT232R (optional), Elektor Store # 110553-91
Bt1 = CR2032 battery
S1,S2 = pushbutton, SPST, chassis mount
K1 = power jack, 2.1mm, PCB mount
K2 = 6-pin (2x3) boxheader
La1 = 5V 300mW light bulb, GOW
PCB # 120740

We buy at:

Discussion (0 comments)

Skalolaz 4 years ago

What is the supply voltage of the device?

Courty 4 years ago

We used 7.5v for this project. This was the best balance and the plug-in psu’s were readily available
Paul (Original Article Author)

TheEditor 4 years ago

It's 9 VDC nominally.

Skalolaz 4 years ago

ok, thanks for your reply. I was planning to use an IV-13 numitron with a 6.3 V heating tube

Courty 4 years ago

If you're using the IN-13's, I would look to Not use the switching part of the circuit at all and power the whole thing from a good 6v PSU. The original reason for the MC34063 was that we didn't know how sensitive the tubes were to voltage fluctuations. Since this article, I have designed Many more clocks and devices around these and other similar tubes and can tell you that they are not super critical on voltage. Don't physically shock them though as the filaments are sensitive to that. Courty (aka Paul)