Let’s use the ULN2003 stepper motor driver for any microcontroller, Arduino, PIC, MCS51, and others. But we can’t drive the motor directly. We need to have a good helper. I recommend ULN2003.
Why should we use it?
It is an IC driver relay, a motor widely used for driving many relays. It is suitable for use in automated control tasks that have a total of 7 operation channels, working independently with each other. Or we called 7 Channel Transistor Arrays.
We can use it to work instead of many transistors. Therefore making the circuit smaller And less complicated as well.
ULN2003 Features(Why use it)
- We can use logic devices like Digital Gates, Arduino, PIC, etc to control it directly.
- It includes 7 high-voltage and high current Darlington pairs inside
- Each pair is rated for 50V and 500mA
- We can trigger the Input pins by +5V
- All 7 Output pins can connect to drive loads up to (7×500mA) about 3.5A.
- Available in 16-pin DIP
ULN2003 Datasheet and pinout
See in the block diagram or its pinout.
See the logic diagram in IC. Inside, there is already a diode. Therefore, when connecting to the Relay, no additional Diode must be connected.
ULN2003 internal circuit and Pin Configuration
The internal circuit uses connecting Darlington transistor. Resulting in using only a small amount of current to drive the relay.
How to use each pin
- The INPUTs
Pin 1 to Pin 7 is input 1 to input 7. They have the 7 Input pins of the Darlington pair, each pin is connected to the base of the transistor and can be triggered by using +5V.
- The OUTPUTs
Pin 10 to pin 16 is Output 1 to Output 7. They are respective outputs of seven input pins. Each output pin will connect to the ground only when its respective input pin is high(+5V)
- The Ground of the circuit
- COM Use as test pins. They are optional to use
Recommended: How does an SCR work
Example ULN2003 circuits
What is more? see how it in example circuits below
Arduino ULN2003 stepper motor driver circuit
PIC Microcontroller 5 Relay Driver circuit
Then, see the 12V Relay driver circuit using the PIC microcontroller (PIC16F877A).
Stepper motor driver using a parallel port
This is an easy-to-build stepper motor driver that will allow you to precisely control a unipolar stepper motor through your computer’s parallel port. With a stepper motor, you can build a lot of interesting gadgets such as robots, elevators, a PCB drilling mill, a camera panning system, an automatic fish feeder, etc. If you have never worked with stepper motors before you will surely have a lot of fun with this project.
But These Stepper Motor Controller Connection Diagrams use 2 port voltage are 5Volt and 12V and four resistors, a Zener diode.
The Four-Wire Connection the ULN2003 (High-Voltage High-Current Darlington Transistor Array
)/ MC1413 is a 7-bit 50V 500mA TTL-input NPN Darlington driver. This is more than adequate to control a four-phase unipolar stepper motor such as the KP4M4-001.
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I love electronics. I have learned them by creating the Electronic Circuits and Simple projects to teach my children. Most importantly I hope sharing our experience on this site will be helpful to you.