Page 321 - ARM Based Microcontroller Projects Using MBED

11.3 PROJECT 1—TMP102 TEMPERATURE SENSOR 307

FIG. 11.2 Block diagram of the project.

11.3 PROJECT 1—TMP102 TEMPERATURE SENSOR

11.3.1 Description
In this project the TMP102 temperature sensor module is used to read and display the am-
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bient temperature on the PC screen. This sensor is I C bus compatible.

11.3.2 Aim
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The aim of this project is to show how an I C bus compatible device can be connected to the
Nucleo-F411RE development board and also how it can be programmed using Mbed.
11.3.3 Block Diagram

The block diagram of the project is shown in Fig. 11.2.

11.3.4 Circuit Diagram
TMP102 module (see Fig. 11.3) has the following pins:

GND: Power supply ground
Vcc: Power supply (1.4–3.6V)
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SDA: I C data line
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SCL: I C clock line
ALT: Alert
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ADD0: I C address select
The ADD0 pin is used to select the device address. By default the device address is 0x48.
Four different addresses can be selected depending on where the ADD0 pin is connected to:

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ADD0 Connection I C Address
No connection 0x90 (default)
GND 0x90
Vcc 0x91
SDA 0x92
SCL 0x93