Stepper Motor Control: Parts List

Current Part:

Parts List
· 15 Volt Power Supply
· 9 Volt Power Supply
· 9.2 Volt Power Supply
· Tiny-ICD2 PIC Programmer
· DB-9 Serial Cable
· Olimex P-40 Development Board
· PIC18F452
· 9.2v 2-Phase Stepper Motor
· (2) LMD18245 H-Bridge
· (2) Resistors - 68kΩ
· (4) Capacitors - 100nF

(Scroll Down for Part Descriptions)

Parts List Details
           You may or may not be familiar with the parts above so a picture of each item has been included to clear up any possible questions.

Olimex P-40 Development Board & 9v Power Supply
           This development board is built & sold by Olimex. It has a very simple layout that is great for beginners. It features a 20 MHz clock, (for the PIC this means it executes 1 instruction every 1/5,000,000 of a second). The 9v Transformer just provides the DC power required by the board. A 9v battery could easily take its place.

ICD2-Tiny Pic Programmer & 15v Power Supply
           This is a smaller version of the larger & much more expensive ICD2. ICD stands for In-Circuit Debugger. This means that the programmer not only programs, but also features debugging capabilities.

9.2v Power Supply
           This will be used to provide power to the stepper motor. The stepper motor will never require more than 250mA of power so you can actually just use the power coming from the 9v supply that the development board uses.

DB-9 Serial Cable
           There is really nothing special about this cable. It just a standard 9-pin Male->Female serial cable. Make sure your computer has a serial connection! Many newer laptops only have USB ports and no COM (communications) port.

9.2v Stepper Motor
           This is a 2-Phase stepper motor. It is rated at 9.2v and 250mA. It is capable of 0.9° per step. These three things (voltage rating, current rating & step size) are what you need to know inorder to attempt to control any stepper motor.

LMD18245 H-Bridge
           The LMD18245 chip is a rather odd looking chip with non-standard pin. It has 15 Pins in total although we won't be using them all. This chip is manufactured by National and you can get free samples of it at their website.

Assorted Resistors and Capacitors
           These will be used in the 'current sensing' feature of the LMD18245 chip. This feature allows us to choose how much current can flow through the motor, thus controlling motor speed.