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To measure Temperature in LCD graph. |
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 Display graph using in the nokia 3310 or equivalent, in this employed case in a meter of digital temperature.
 Project of a temperature meter using a graphic LCD, a sensor of temperature of the type DS18B20 and a pic16f628. But start for the model lcd that we will use, will use an existent model in the nokia 3310. This lcd can be found very easily at the telemoveis stores and at a very low price, it almost always never crosses the 15 euros.
But we see their characteristics:
The lcd of the nokia 3310 is a very practical display to be used in projects with microcontrolers, being very easy to connect, since it uses a communication normal SPI. Tends a resolution of 84*48 pixel´s, we have a good area for presentation of data and the only necessary external component is a condenser of 4,7µF among the pins VOUT and GND. Feeding among 2.7 to 3.3 V. Very small consumption, ideal to be used in applications with battery.
 
| Pin |
Signal |
Description |
Type |
| 1 |
VDD |
Power source. Support between 2,7 and 3,3V. |
Power source |
| 2 |
SCLK |
Clock IN. |
In |
| 3 |
SDIN |
Data IN
|
In |
| 4 |
D/C |
Selection way.Selects between comands/adress and data entry. |
In |
| 5 |
SCE |
Activation display. Active in LOW. |
In |
| 6 |
GND |
ground |
Ground
|
| 7 |
VOUT |
Conversor DC/DC. |
Power S2
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| 8 |
RESET |
Reset. Active in LOW. |
In |
Sensor DS18B20
The type of chosen sensor was a DS18B20. This type of sensor of temperature digital 12 bits (configuravel) we obtain a resolution of maxim of 0,0625 ºC with + / - 0,5 ºC. The type of used connection is the same used already in all of the connections known of Dallas, to 1Wire, therefore we will only use an only pin of the pic16f628.
The Project
The project could not be simpler because we just needed 4 external components, or be 3 resistances of 10K and a condenser of 4,7µF, together with the display, the pic16f628 and the sensor DS18b20.
Schematic:
The function of the jumper is the option of having the display in inverted way, the alteration of the same should be made when the circuit is not powered.
 In the section of the project in Downloads is a version of the file for this measurement way, in graph.
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