The ULN2003 is a high-voltage, high-current composite transistor array consisting of seven silicon NPN composite transistors. Each Darlington pair is connected in series with a 2.7K base resistor. At a working voltage of 5V, it can be directly connected to TTL and CMOS circuits and can directly process data that previously required standard logic buffers.
The 51 microcontroller is a general term for all microcontrollers compatible with the Intel 8031 instruction set. The progenitor of this series is the Intel 8004 microcontroller. Later, with the development of Flash ROM technology, the 8004 microcontroller made significant progress, becoming one of the most widely used 8-bit microcontrollers. Its representative model is the Atmel AT89 series, which is widely used in industrial measurement and control systems. Many companies have released 51-series compatible models, and it will occupy a large market share for a long time to come. The 51 microcontroller is a basic introductory microcontroller and also one of the most widely used. It is important to note that 51-series microcontrollers generally do not have self-programming capabilities.
Typical application circuit diagram of 51 microcontroller ULN2003 driving stepper motor
51 Microcontroller ULN2003 Driving a Stepper Motor - Typical Application Circuit Diagram. This stepper motor has 6 leads, arranged in the following order: 1: Red, 2: Red, 3: Orange, 4: Brown, 5: Yellow, 6: Black. It is driven using the 51 microcontroller-driven ULN2003 method.
This stepper motor has a drive voltage of 12V and a step angle of 7.5 degrees. It requires 48 pulses to complete one 360-degree revolution.
The ULN2003 is driven directly using the 5V voltage of the microcontroller system, which may not provide very high torque. Users can increase the drive voltage to 12V themselves.
