Dùng màn hình Nokia đo nhiệt độ sử dụng DS18B20
Sử dụng màn hình của điện thoại cũ cho nhiều ứng dụng
Nokia 3310 có LCD (84x84 pixels), that isn't that hard to get and can be very useful in DIY (do it yourself) electronics.
This page describes a device I designed to test such a display and turned out to be the circuit that I am proud to share with you. Since my motto is �simplicity in construction�, with a few parts you will be able to create a relatively accurate and visually appealing thermometer.
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The LCD supports two modes of operation (normal and inverse), the jumper placed on the back of the device is used for changing modes. | Negative temperatures are given a �minus�, the bar shows temperatures normally but with an added minus. | In this picture I charged the device with a 3.6V lithium battery. Do not use a greater voltage then this because the Nokia 3310 LCD works with 2.7 to 3.3V!!! Careful! |
Tổng quan |
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Sơ đồ-Mạch in |
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Mạch in | Linh kiện |
Điều chỉnh tương phản |
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.
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Downloads |
Tải chương trình: | Nokia LCD Thermometer � PIC12F629 - in hex |
Nokia Lcd Thrmometer - PIC12F675 - in hex | |
Tải mạch điện và mạch in: | Nokia Lcd Thermometer - made in Protel 99 SE |
Nokia Lcd Thermometer.pdf - PCB in pdf |
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.
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