Wireless Nixie Thermometer

The Target of this Project was to learn how to use different functions of the at mega:
• Connecting two At me gas with a wireless connection
• Each At mega has a Thermometer (DS1621) to read the actual temperature
• Use the sleep Mode of an At mega
• Controlling a Nixie bar graph In-13
And this all together is a nice looking self-made Thermometer. 🙂
There are similar Thermometers available e.g. the thermo Neon from Salt Tech Chips: https://www.facebook.com/SALTechips?fref=ts but this is only for one Temperature and I like to show the inside and outside temperature.
Wireless Nixie Thermometer

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
2.2V3.8V 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 Pollen 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 bar graph.
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.

Step 4: The Scale

The scale is made by the company Schaeffer: https://www.schaeffer-ag.de9/produkte/frontplatten/…

There you can download a program to create your own CAD-Drawings.

Very cool is that you can after drawing generate the cost of the product.

One Scale costs about 50€.

> It is not very cheap but at the end it is a very good product.

At my scale I in street at one side the Celsius and at the other Fahrenheit. At the top you can read if it is the internal or the outside temperature.

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