V1BOOST-STEPPER Unipolar Stepper Motor BoosterPack for the MSP430 LaunchPad. User s Guide

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1 V1BOOST-STEPPER Unipolar Stepper Motor BoosterPack for the MSP430 LaunchPad User s Guide Revised July 2012

2 CONTENTS 1 Introduction Overview Features Additional Information Contents V1BOOST-STEPPER Demo Setup Software and Project Setup Program MSP430G Hardware Setup Demo Experience Unipolar Stepper Motor Demo Project Unipolar BoosterPack Hardware ULN2003V12 Configuration MSP430 LaunchPad Supply Unipolar Stepper Motor Power Supply Eagle Documentation Eagle Schematic PCB Layout Bill of Materials

1 INTRODUCTION 1.1 OVERVIEW The V1BOOST-STEPPER Unipolar Stepper Motor BoosterPack is an extension module for the MSP-EXP430G2 MSP430 LaunchPad Value Line Development Kit.

3 1 INTRODUCTION 1.1 OVERVIEW The V1BOOST-STEPPER Unipolar Stepper Motor BoosterPack is an extension module for the MSP-EXP430G2 MSP430 LaunchPad Value Line Development Kit. It is connected to the MSP-EXP430G2 MSP430 LaunchPad through the 10 Pin headers located at positions J1 and J2 on the MSP430 LaunchPad Figure 1: V1BOOST-STEPPER Unipolar Stepper Motor BoosterPack 1.2 FEATURES The V1BOOST-STEPPER Unipolar Stepper Motor BoosterPack features the new ULN2003V12 Inductive Load Sink Driver from Texas Instruments. This inductive load sink drive is compatible with 3V micro-controllers and logic interfaces which make it perfect for driving inductive loads with a control signal from an MSP430G2553 microcontroller. The V1BOOST-STEPPER Unipolar Stepper Motor BoosterPack also includes two ua78m00 Family onboard fixed voltage regulators for powering the unipolar stepper 3

4 motor as well as the MSP-EXP430G2 MSP430 LaunchPad. Details of onboard fixed voltage regulators are addressed in Section 4. Connecting the 430BOOST_STEPPER Unipolar Stepper Motor BoosterPack does not limit your design. It also includes a second row of 10 pin male headers for connecting other MSP430 BoosterPacks such as the 430BOOST-SENSE1 - Capacitive Touch BoosterPack. Figure 2: V1BOOST-STEPPER Unipolar Stepper Motor BoosterPack connected to the MSP430 LaunchPad with the Capacitive Touch BoosterPack attached. Full list of V1BOOST-STEPPER features includes: ULN2003V12 Inductive Load Sink Driver configured to drive a 6/5 wire unipolar stepper motor DC barrel connector provides power to the unipolar stepper motor and MSP430 LaunchPad through two separate fixed voltage regulators LED indicates power output to unipolar stepper motor Two STDP slide switches allow users to toggle the power from both regulators independently, allowing the choice of powering the MSP430 LaunchPad from either the USB module or external DC power source Second row of 10 pin male headers for connecting other MSP430 BoosterPacks 4

5 1.3 ADDITIONAL INFORMATION Refer to the ULN2003V12 Inductive Load Sink Driver datasheet for further design information. This datasheet can be located through the following link: Information about both onboard fixed voltage regulators can be located through the following link: Additional information about the MSP-EXP430G2 MSP430 LaunchPad Value Line Development Kit can be found on the LaunchPad s Wiki page located here: CONTENTS This is a list of what is required to operate the Unipolar Stepper Motor BoosterPack along with its Demo Project. V1BOOST-STEPPER Unipolar Stepper Motor BoosterPack MSP-EXP430G2 MSP430 LaunchPad Value Line Development Kit with MSP430G2553 Microcontroller 430BOOST-SENSE1 - Capacitive Touch BoosterPack AC DC Power Adapter (Input 100V 240V AC 60/50 HZ) (Output 12V DC 1A) 8V Unipolar 6 Wire Stepper Motor 5

6 2 V1BOOST-STEPPER DEMO SETUP This section will describe setup of the software and hardware used for the demo provided with the V1BOOST-STEPPER Unipolar Stepper Motor BoosterPack. It is important to follow these steps to begin developing applications for the MSP430G2553 microcontroller on the Unipolar Stepper Motor BoosterPack 2.1 SOFTWARE AND PROJECT SETUP To run the Unipolar Stepper Motor BoosterPack Demo, Code Composer Studio version will need to be installed. Installation can be found at the following link: This installation will include the USB driver required for programming the MSP430G2553 device. After the installation follow these steps to import the Unipolar Stepper Motor Boosterpack Demo Project: 1. Run Code Composer Studio V5 and enter an appropriate workspace for the demo project. 2. Download the existing demo project located on the V1BOOST-STEPPER project page at: 3. In the menu bar for Code Composer Studio, click on the projects tab and import existing CCS project. Browse to find the downloaded project from step PROGRAM MSP430G2553 The following steps will properly program the demo project onto the MSP430G2553 device. 1. Insert the MSP430G2553 device into the 20 Pin socket on the MSP430 LaunchPad. 2. Ensure that the J3 header on the MSP430 LaunchPad has all the jumpers connected. 3. Connect the MSP430 LaunchPad to the computer through USB 4. With the Demo project open in Code Composer Studio, run the debugger. This will program the MSP430G2553 device. 5. Terminate the debugger. 6

7 2.3 HARDWARE SETUP The Unipolar Stepper Motor BoosterPack uses an external supply to power the MSP430 LaunchPad and the unipolar stepper motor. WARNING: Improper setup of hardware for the Unipolar Stepper Motor BoosterPack could result in damage to the BoosterPack, MSP430 LaunchPad, or other attached boosterpacks. Follow the steps below to configure the MSP430 LaunchPad, Unipolar Stepper Motor BoosterPack, and Capacitive Touch BoosterPack for the Demo project. 1. Disconnect the jumpers on header J3 and J5 of the MSP430 LaunchPad. 2. Install the Unipolar Stepper Motor BoosterPack onto the MSP430 LaunchPad s 10 pin male headers. If male headers are not installed on the LaunchPad, they will need to be soldered on before continuing. When the Unipolar Stepper Motor BoosterPack is installed, the DC barrel connector needs to be pointed in the same direction as the USB port on the MSP430 LaunchPad. Please refer to Figure Install the Capacitive Touch BoosterPack on top of the Unipolar Stepper Motor BoosterPack as shown in Figure 2. The capacitive touch BoosterPack is oriented in the same direction it would be relative to the LaunchPad for the Capacitive Touch User Experience. 4. Install External DC Power Supply provided with Unipolar Stepper Motor BoosterPack. This supply is an AC to DC power adapter that requires a V AC 60/50 Hz input. 5. Turn on the slide switches for powering the unipolar stepper motor and the MSP430 LaunchPad. The on position for the slide switches is the furthest position away from the external DC power Supply connector. 6. Install the 6 wire unipolar stepper motor into the 6 pin female header located on the bottom of the Unipolar Stepper Motor BoosterPack. Figure 3 shows the configuration of the unipolar stepper motor s windings and supply taps. 7

8 Figure 3: Configuration of Stepper Motor 6 Pin Header. The 6 wire unipolar stepper motor should be connected according to Figure 3 and 4. The center taps of both windings are attached to the unipolar stepper motors supply Figure 4: Unipolar Stepper Motor Connection to 6 Pin Header. The Final setup of the Unipolar Stepper Motor BoosterPack Demo project is shown in Figure 5. 8

9 Figure 5: Unipolar Stepper Motor BoosterPack Hardware Setup. Unipolar Stepper Motor is plugged into rear header on V1BOOST-STEPPER Motor BoosterPack. 9

10 3 DEMO EXPERIENCE Demo Experience outlined in this section assumes all software and hardware setup was done in section 2. This demo experience section will describe the operation of the Unipolar Stepper Motor BoosterPack Demo Project. 3.1 UNIPOLAR STEPPER MOTOR DEMO PROJECT The Unipolar Stepper Motor BoosterPack Demo Project demonstrates the operation of the V1BOOST-STEPPER Unipolar Stepper Motor BoosterPack in conjunction with the 430BOOST-SENSE1 Capacitive Touch BoosterPack. Once the power is activated to the MSP430 LaunchPad, baseline capacitive measurements are taken by the MSP430G2553. The demo then will wait in Full-Step Mode for the user to manipulate the motor by the capacitive touch. Movements around the capacitive wheel will correspond to varying degrees of movement by the motor. LEDs bordering the capacitive touch BoosterPack will light up and change positions in sequence with the progress of the stepper motor. Figure 6: LED pattern while demo is in Full Step Mode. Should the user touch the middle button for several seconds, the motor will toggle between full and half step modes. Half step mode provides a somewhat lower speed, but is smoother. Half step mode can be differentiated from full step by the LEDs that 10

activate. Should half step mode be on, only the right-hand side lights will be activate while full step will toggle the left- hand side. Figure 6: LED pattern while demo is in Half Step Mode.

11 activate. Should half step mode be on, only the right-hand side lights will be activate while full step will toggle the left- hand side. Figure 6: LED pattern while demo is in Half Step Mode. As a power saving feature, the motor will be turned off after a period of inactivity and all LEDs on the Capacitive Touchpad will power down. This greatly reduces the overall power consumption of the system. It should be noted that power saving mode will allow the drive shaft to spin freely and should be disabled when the stepper is supporting a load. Press the middle button on the capacitive touch to wake the demo from sleep mode. 11

12 4 UNIPOLAR BOOSTERPACK HARDWARE The V1BOOST-STEPPER Unipolar Stepper Motor BoosterPack board consists of three main hardware subsystems. ULN2003V12 Inductive Load Driver configured to drive 6 wire unipolar stepper motor UA78M33 Fixed Voltage Regulator used to supply MSP430 LaunchPad through external power supply UA78M08 Fixed Voltage Regulator used to supply 8V unipolar stepper motor This section outlines these hardware features Figure 8: Unipolar Stepper Motor BoosterPack Topview 12

4.1 ULN2003V12 CONFIGURATION The ULN2003V12 is a 16 pin device. It has 7 channels each containing a free-wheeling diode for driving inductive loads.

13 4.1 ULN2003V12 CONFIGURATION The ULN2003V12 is a 16 pin device. It has 7 channels each containing a free-wheeling diode for driving inductive loads. The ULN2003V12 is configured to the pins of the MSP430G2553 Microcontroller as shown in Figure 9. Figure 9: ULN2003V12 Configuration to Microcontroller Pinout and Unipolar Stepper Motor. Port 1 pins 4-7 are used to control the unipolar stepper motor. Channels 1-4 of the ULN2003 Inductive Load Driver are used for stepper motor operation. 4.2 MSP430 LAUNCHPAD SUPPLY The UA78M33 Fixed voltage regulator supplies the MSP430 Launchpad with a constant voltage of 3.3V. Refer to the MSP430 LaunchPad Users guide for further information about supplying the MSP430 LaunchPad with an external power source. The input voltage comes from a external 12V 1A AC to DC power adapter. This is regulated to 3.3V at the output of the regulator. A 0.1uF ceramic capacitor is placed across the output of the voltage regulator to improve its transient response. A STDP slide switch is included. This allows the user the ability to supply the MSP430 Launchpad through the Unipolar Stepper Motor BoosterPack or through the USB connection on the LaunchPad. 13

14 4.3 UNIPOLAR STEPPER MOTOR POWER SUPPLY The unipolar stepper motor is supplied by a UA7808 Fixed Voltage Regulator. A STDP slide switch allows the user to turn the power supply off and on. The output of the regulator includes the same capacitor that was in the MSP430 LaunchPad Supply regulator and also includes a LED indicator circuit as a visual indication that the supply is on. It is possible to solder on different regulators for different sized stepper motors. If this is done, the regulator, stepper motor, and ULN2003V12 datasheets will need to be consulted to verify they are operating in approved ranges. 14

15 5 EAGLE DOCUMENTATION PCB Layout was created with CadSoft Eagle Version Schematic, PCB Layout, and Bill of Materials is addressed in this section. 5.1 EAGLE SCHEMATIC Figure 10: V1BOOST-STEPPER Unipolar Stepper Motor BoosterPack Schematic 15

5.2 PCB LAYOUT Figure 10: V1BOOST-STEPPER Unipolar Stepper Motor BoosterPack PCB Layout 5.2 BILL OF MATERIALS Quantity Part Number Description 2 929400E-01-36-ND CONN HEADER.

16 5.2 PCB LAYOUT Figure 10: V1BOOST-STEPPER Unipolar Stepper Motor BoosterPack PCB Layout 5.2 BILL OF MATERIALS Quantity Part Number Description E ND CONN HEADER.100 SNGL STR 36POS 2 S5602-ND CONN FEMALE 10POS.1" SMD TIN 1 S5442-ND CONN FEMALE 6POS.100" R/A TIN 2 CKN1779CT-ND SWITCH SLIDE SPDT.4VA SMD ND CAP CER 0.1UF 16V 10% X7R ULN2003V12 20V Inductive Load Driver SOIC 1 RHM1.2KBGCT-ND RES 1.2K OHM 1/2W 5% 2010 SMD 1 CP-102A-ND CONN JACK POWER 2.1MM PCB 1 ua78m08 IC POS VOLT REG FX 8V SOT ua78m33 IC POS VOLT REG FX 3.3V SOT * 5mm LED 1 ** Unipolar Stepper Motor 8V 1 SF-789 AC DC Power Adapter Input V Output 12V * LED is used in series with 1.2K ohm resistor to indicate motor power supply is ON. ** Unipolar steppermotor should load ULN2003V12 according to specifications listed on its datasheet. 16

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