Demo One: DS1621 thermometer with LCD readout --- Files download

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Demo One: DS1621 thermometer with LCD readout

AIM:
The temperature is recorded by DS1621 in which the data is passed through the 2-wire interface (SDA and SCL) to STC89C54RD+. The readout is shown by the 16 x 2 LCD display afterwards. See Figure 1 below.


FEATURES:

• Using 8-pin DIP package DS1621, good for DIY project.
• Small in size BASCOM 8051 BASIC program (less than 40 instructions).
• Easy to manipulate the I2C communication.
• Fast to initiate the LCD.
  

Figure 1. The room temperature as shown on the 16 x 2 LCD is 23 degree C.

CIRCUIT:
The LCD and STC89C54RD+ are connected as standard configuration. The DS1621’s address lines A0 to A2 is connected to the ground in this circuit. Its data SDA and clock SCL are connected to MCU I/O pins, say P0.0 and P0.1.

Figure 2. The DS1621 thermometer schematic.

PROGRAM:

Figure 3. The 8051 BASIC program for the DS1621 thermometer. There are fewer than 40 instructions.

DOWNLOAD:

• The schematic in PDF format: DS1621_Thermometer.pdf (33.52 KB, 下載次數: 2662)
  24-3-2011 09:18 上傳

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  DS1621 Thermometer
• DS1621 thermometer program : DS1621_Thermometer.TXT (1.31 KB, 下載次數: 2606)
  24-3-2011 09:38 上傳

  點擊文件名下載附件