Just attach the different loads with a different power source with ULN2003. We could handle multiple devices with this single device.
It has wide use as a torch sensor with the microcontrollers. Efficient to use Logic Buffer in mostly Digital Electronics. High load LED Bulbs can be controlled through it. Inductive loads are also easy to control by using ULN2003. It is mostly used to control the stepper motor. 7-relays can be controlled with a single ULN2003. The power source of each motor could be different, but the ground should remain common. In the case of inductive load protection, this COM pin will be effective for IC safety. This button could be used to bypass all the pins and could produce the output. Attach this pin with the ground through a button. Then attach both Grounds of Controller and Power Source with ULN2003 Ground pin to keep in sync with the ULN2003. Attach the other end of the load with the Power source of 0 – 50V. Then Attach the one end of the load with the output pin. Attach any IC or Controller as an Input Source to provide the logical signal to the Input Pins. To use this IC there are some rules which we need to follow to make it work perfectly. ULN2003 could be use any point where we need to control the high DC volts approximately 50V. It operates without using any power source attached directly to it. ULN2003 output is compatible with all the TTL and 5-V CMOS logic. It is available in all kind of packages like SOP, PDIP, TSSOP or. We can control by any low voltage device like Arduino, Microprocessor or any other controller or IC. ULN2003 has an internal flyback system protection and a pin too which can be used for an inductive load. Comes with an internal clap diode to protect the device from Back EMF Protection. The range of current could be increased by using the two pins for the same load. The current handling system is also 500mA for each input. It comes in another version with a voltage range of 100V. It is able to handle the high DC voltage range of about 50V maxima. 
Attach any load within 50V and 500mA from the outside to the Output to make the load functional. Output pins are the common ground within the ULN2003. In some cases, it is also used as an inductive load. It is mostly known as test pins to turn on all the outputs. GND pin will be used as a common ground with both the Ground of the output power source and an input power source.Ĭommon pin used for multiple functions. Input 2 will affect the Output 2 and that will go on till the Input 7 and Output 7. If Input logic is High (5 Volts) then there will be Output otherwise not. These all are the input pins used to control the output pins. PIN CONFIGURATION Description Pin1 (Input 1) To solve this issue an IC name ULN2003 was introduced. This circuit could only be used for a single load. A logical circuit with Darlington transistor (NPN) was used to control the High DC load approximately equal to 50V and 500mA. There was a wide usage of High voltage DC motors due to its energy efficiency.
#Common pin relay how to
Now the problem was how to control and minimize the circuit of high voltage DC devices. The issue of generating multiple functions was solved by a simple controller and processor.
These control functions also help us to generate the timer, PWM, interrupts, and switching method internally without affecting the whole controller circuit.
Microcontroller and Microprocessor have an internal program or as we can say a set of functions, which control the voltage at the output and input pins of a single Control Unit.
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