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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: 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

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