Thus, the absence or failure of specific power source can be represented by pressing a particular switch or key. This project utilizes microcontroller of 8051 family which is interfaced with four switches (these switches or selection keys are assumed to be four different power sources mentioned above). This is an innovative electrical engineering project that eliminates the power supply interruptions by auto power supply from (integrating and controlling) the four different electric power sources such as solar power, mains power supply, generator, and inverter. Practical Implementation of Relay Driver Circuit Practical Implementation of Relay Driver Circuit by PORTD.R7 = 1 //Relay 7 turns ON…and so on.īased on the signals received from the microcontroller the relay driver circuit drives the relay or relays ON and OFF, such that controlling the operation of loads connected to these relays. The program that can be used for turning the relays ON and OFF is given below with delay time of one second. The clamp diodes are built in these relays driver ICs and which eliminates the usage of freewheeling diodes. The above circuit represents the interfacing of PIC microcontroller (PIC16F877A) with relays using a relay driver circuit with ULN2003. The installment concludes by presenting a practical scratch and. This month we describe the operating principles of various circuits of this type and present a selection of practical audio power amplifier circuit designs. We can use seven relays with relay driver circuit using ULN2003 and the relay driver circuit using ULN2803 enables to use eight relays. One of the most popular applications of transistors is in audio power amplifiers. It is difficult to use a number of relays with transistors, so, relay driver IC ULN2003A can be used for availing more relays. Relay Driver Circuit using ULN2003 Relay Driver Circuit using IC ULN2003 The IC ULN2003A comprises of 7-NPN Darlington pairs as shown in the internal schematic diagram and is typically used to switch inductive loads (dissipates voltage spikes if any using suppression diode) and to drive stepper motors. The pin diagram of IC ULN2003A is shown in the above figure which consists of 16 pins. Relay Driver IC ULN2003 Internal Schematic Diagram
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