elektron IN9-Nixie Bargraph Thermometer

The IN9-Nixie Bargraph Thermometer displays room temperatures on an adjustable colour-lighted scale in Celsius and Fahrenheit.
All functions are controlled by an Arduino Nano, also the attractive visual effects (bargraph and RGB backlight with adjustable colours).

MAIN FEATURES
- Temperature scale in Celsius and Fahrenheit from 10°C to 30°C / 50°F to 85°F
- Graphical representation with Russian IN-9 tube
- RGB backlight with adjustable colours
- 5 V DC supply voltage via USB connector
- Based on an Arduino Nano
- 0.6 - 1.7 W of energy consumption depending on temperature (+/– 0.9 W at 20°C)
- Supports temperature sensors DS18B20, DS18S20 and DS1822
- Uses only through-hole parts
- Arduino development environment

Bargraph tubes like the Russian IN-9 and IN-13 linear indicators can be used for linear gauge displays. As they do not show digits, these are not strictly spoken "Nixie" tubes. Nevertheless, they share the same warm vintage light many of us enjoy.

RGB colour-lighted scale

This bargraph thermometer from Elektor-Labs is based on an Arduino Nano. It offers a beautiful graphical representation of the temperature with a Russian IN-9 tube and a lighted scale with adjustable colours.
The temperature scale in both Celsius and Fahrenheit runs from 10°C to 30°C / 50° F to 85°F
The circuit consists of a 5 V to 150 V "voltage doubler" step-up converter, an IN-9 tube driver based on a low voltage rail-to-rail opamp, two RGB LEDs and the Nano.
Flickering of the display is avoided by the Arduino Nano switching the IN-9 tube on and off around 75 times a second. To prevent cathode poisoning of the IN-9 tube, a pleasant sweep animation is displayed at an adjustable interval.
The temperature sensor is a DS18B20. As the total power consumption is less than 1 W, the thermometer can even be powered via a standard USB port on a computer.

On the corresponding Elektor-Labs project page, you’ll get an insight into the reasons behind the choice of the IN-9 tube and the way it is driven.
A full kit of this project is available in our online Store. It is easy to assemble, as only through-hole parts are used.

elektron IN9-Nixie Bargraph Thermometer
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Science & Technology	Upload TimePublished on 10 May 2018

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