Wireless Nixie Thermometer

The Target of this Project was to learn how to use different functions of the atmega:
• Connecting two Atmegas with a wireless connection
• Each Atmega has a Thermometer (DS1621) to read the actual temperature
• Use the sleep Mode of an Atmega
• Controlling a Nixie bargraph In-13
Wireless Nixie Thermometer
And this all together is a nice looking self-made Thermometer. 🙂
There are simular Thermometers availible e.g. the thermNeon from SaltTechChips: https://www.facebook.com/SALTechips?fref=ts but this is only for one Temperature and I like to show the inside and outside temperature.

Step 1: The RFM12b

RFM12B is a low costing ISM band transceiver module. It works signal ranges from 433/868/915MHZ bands.
The SPI interface is used to communicate with microcontroller for parameter setting.
Important features of the Module:
• Automatic antenna tuning
• Low costing, high performance and price ratio
• 2.2V – 3.8V power supply
• Standby current less than 0.3uA
• 16 bit RX Data FIFO
• You can sent/receive with the same module
• It cost 4-5€ each module
At Pollin you can also download programming examples!
There are a lot of examples, how to use this module:

A Nixie tube, or cold cathode display, is an electronic device for displaying numerals or other information using glow discharge.
The IN-13 Nixie Tube is a bargraph.
• Voltage: 150V
• Length: ca 120mm
Here you can find a very good test about the Nixie Tube:

Step 3: DS1621 Thermometer

The DS1621 Digital Thermometer and Thermostat provides 9-bit temperature readings, which indicate the temperature of the device.
Temperature settings and temperature readings are all communicated to/from the DS1621 over a simple 2-wire serial interface.
For more detail: Wireless Nixie Thermometer

About The Author

Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough research and presenting information in a structured and logical format.

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