![]() 555 timer produces clock pulses depending on the values of resistor, potentiometer and capacitor. WORKING:Īfter making connections properly if you switch on the circuit motor will start rotating in steps. This ensures no interruption in the motor’s rotation. ![]() 10 is connected to pin15 so that after 4rth count IC resets and counting starts from the beginning again. As we require only first four pins for one complete revolution of motor or first four decimal counts from o to 3, pin no. This causes certain delay in rotation of motor which is unnecessary. Connect other wires of stepper motor in such a way so that coils are energized one by one to complete one full revolution properly.( you can look into datasheet of the motor provided by the manufacturer) WHY OUTPUT PIN 10 OF IC 4017 IS CONNECTED TO ITS PIN 15 (RESET PIN)?Īs already mentioned above 4017 counts clock pulses one by one up to 10th clock pulse and gives high output on output pins accordingly, each output pin goes high. Connect common wire of stepper motor to the positive of supply.Ħ. Connect 10 and 15th pin to ground through a 1k resistor.ĥ. Connect pins 3,2,4,7 one by one to transistors 1,2,3,4 respectively.Ĥ. ![]() Connect enable pin or 13th pin of 4017 to ground.ģ. Connect pin 3 or output pin of 555 timer to pin 14 (clock pin ) of IC 4017.Ģ. ![]() Transistors enable high current to pass through them and then motor, thus excluding 555 timer completely as it can supply very little amount of current.
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