Here we will explore using the versatile ULN2003A Darlington Transistor array with a typical micro-controller such as Arduino. The ULN2003A is a high-voltage, high-current Darlington transistor array consisting of seven NPN Darlington pairs that feature high-voltage outputs with common-cathode clamp diodes for switching inductive loads. Relay driver circuit using ULN2003 ULN2003 is a very famous relay driver integrated circuit. Relay driver IC uln2003 is high voltage and high current integrated IC which used Darlington array. Its contains seven Darlington pair of a transistor which have high voltage and high current carrying capability. We can use seven relays with relay driver circuit using ULN2003 and the relay driver circuit using ULN2803 enables to use eight relays. The above circuit represents the interfacing of PIC microcontroller (PIC16F877A) with relays using a relay driver circuit with ULN2003. The clamp diodes are built in these relays driver ICs and which eliminates the usage of freewheeling diodes. The ULN2003 stepper motor driver board allows you to easily control the 28BYJ-48 stepper motor from a microcontroller, like the Arduino Uno. One side of the board side has a 5 wire socket where the cable from the stepper motor hooks up and 4 LEDs to indicate which coil is currently powered. The motor cable only goes in one way, which always helps. The ULN2003 Stepper Motor Driver Module is small size & ease to use electronic module, it used ULN2003 Chip to amplify the signal from the micro controller, Input voltage max 15v Logic Control Voltage: 3 to 5.5v.
- Uln2003 Driver Board Schematic
- Dc Motor Driver Circuit Using Uln2003 System
- Arduino Stepper Uln2003 Motor Driver
- Uln2003 Driver Board Pdf
- Dc Motor Driver Circuit Using Uln2003 Switch
This project is an extension to two-phase Unipolar Stepper motor interfacing with AT89C51. In the previous project, transistor switches were used to interface the stepper motor with the microcontroller. Here the transistors have been replaced by using a ULN2003 IC to drive the stepper with 8051 microcontroller.
Stepper motor is a variable reluctance DC motor. When correct input sequence of signal is given to the motor, it starts rotation in steps. (For more detail refer Unipolar Stepper motor interfacing with microcontroller AT89C51).
ULN2003 is high voltage, high current Darlington arrays each containing seven open collector Darlington pairs with common emitters. Here it is used as a current driving IC. This IC is required because stepper motor require more than 60mA current and since controller doesn’t work at this current rating so this IC provides high current to the stepper motor.
In the circuit port P2 as output port which provide input sequence to four input pins of ULN3003 and output of ULN2003 drives the motor.
Input sequences are same as in previous project which are
Simplest sequence
0001
Uln2003 Driver Board Schematic
0010
0100
1000
And for half step size
0001
0011
0010
0110
0100
1100
1000
1001
Project Source Code
Dc Motor Driver Circuit Using Uln2003 System
Circuit Diagrams
Circuit-Diagram-Controlling-Stepper-Motor-ULN2003-8051-Microcontroller-AT89C51 |