Precise Thermometer with 3½ Digits LCD Display ICL7106 AD590

Go to the project BP003 if you want to add a bi-colour LED backlight and a power supply board on the thermometer. In addition, an useful video clip is available there to watch the thermometer in action.

Preface

Fig.1 – The digital thermometer's LCD display in action

Fig.1 – The digital thermometer in action

I wanted to build this project because I needed a thermometer in my house, but also, because I wanted to have the occasion to use a LCD display for the first time.

I have always been fascinated by LCDs. Their capability to make numbers, letters and drawings on a glass plate is something magic. Thanks to this project I learnt a bit more about them and I discovered the tricks of the wizardry. Despite this, and even if the LCD displays have become obsolete, I still think they are the result of an amazing technology.

I chose to use the ICL7106 as the driver for the LCD display. This specific IC by Intersil, has also inside an A/D converter necessary to “transform” the analogue signal generated by the temperature transducer into a digital one. For practical reasons, I decided to split the project in two different sections, and then, in two different boards: one for the LCD display and another one for the ICL7106 IC.

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Cooling devices: heat sinks and fans HEAT SINKS FANS

 

Preface

To ensure a proper function of a system, keeping the temperature of all devices within their working values is very important. Since a common working range of temperature is about from -20°C to +85°C, the lower limit is generally negligible. On the contrary, the higher level could be a problem since all the devices, some more and some less, tend to increase their inner temperature. In certain situations, especially in power circuits, it is necessary to use some cooling devices in order to cool down the hot ones and make the environment well ventilated.
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