Page 438 - ARM Based Microcontroller Projects Using MBED

424 17. STM32 NUCLEO EXPANSION BOARDS

17.14.2 Aim
The aim of this project is to show how the X-NUCLEO-IHM13A1 expansion board can be
used in a project to control the speed of a small brushed DC motor.
17.14.3 Block Diagram

The block diagram of the project is shown in Fig. 17.18. The expansion board is plugged on
top of the development board via the Arduino UNO R3 connectors.
17.14.4 Circuit Diagram

Fig. 17.19 shows the project circuit diagram. The arm of A10K linear potentiometer
is connected to analog input PA_1 of the Nucleo-L476RG development board. The other two
terminalsofthepotentiometerareconnectedto+3.3VandGNDpinsofthedevelopmentboard.

17.14.5 Program Listing

The program listing (program: PotMotor) is shown in Fig. 17.20. Analog voltage of the poten-
tiometer is read into variable pot. The value read is a floating point variable between 0 and 1.0,

FIG. 17.18 Block diagram of the project.

FIG. 17.19 Circuit diagram of the project.