使用NOKIA3310液晶屏及DS18B20制作的數(shù)字溫度計(jì),Digital thermometer

Lcd

First we need to extract/salvage the LCD from the Nokia 3310 mobile phone. Be extremely careful and patient during this process, because as you know the display is just a thin piece of glass that is very sensitive.

There is an 8 pin connector on the back of the display, in our case it's glued to the glass (Nokia 3210 has 搑ubber?connectors so this one is much easier to use). This is a Phillips PCD8544 display, it can be easily found on the net if you want more information about it.

PCB

The second step is making the board which is small and isn't that difficult to make. Pay close attention while gluing the plastic edges on the board because they will be holding your LCD. Double check connector positions before gluing. In the bottom corners I glued two plastic separators so the LCD leans on them and not the solder points.

Layout of elements

On the back side we can see the layout of elements, they aren't hard to find and there aren't that many of them.

I placed the temperature sensor DS18B20 in a socket for testing purposes, it is also possible to connect the sensor at a distance by adding wire (I haven't tested 1 wire sensors at a distance yet).

If by any chance the contrast isn't to your liking, it can be changed during the programming of Pic12F629, in the program location D2h. the current value A9h is the one I use with my LCD and don't know it will be for other LCDs. The value can be set to anything between 80h and FFh, 80h being minimum contrast and FFh maximum.

Since I have noticed that there is a problem with programming these microcontrollers you should read the short how-to for programming PIC12F629/675 microcontrollers.

This device was just a test and I hope to have many more circuits that utilize this LCD soon because I'm very fond of its easy implementation.

If you have any difficulty in making this device, feel free to mail me.

附件是相關(guān)的程序和電路，如果感興趣可以下載試做哦

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