The control system is an important part of the mechanical control system with the output of DC, AC, stepper motors as well as servos as well as light control which is called the flashing technique. now let's review the mechanical and light control system using IC 555 PWM (Pulse Width Modulation) mode. we are going to look that is how to do DC motor control PWM with 555 timer IC. This is used to control the speed of a DC motor. The main component of this circuit is a NE555 timer IC . This circuit can be used to control the speed of a DC motor which is used in different things such as conveyors, turntables, etThis circuit can be used to control the speed of a DC motor which is used in different things such as conveyors, turntables, flash indicator , strobo lamp etc .A PWM (pulse width modulation) controller can be thought of as an (electronic) switch between the solar panels and the battery: The switch is ON when the charger mode is in bulk charge mode. The switch is “flicked” ON and OFF as needed (pulse width modulated) to hold the battery voltage at the absorption voltage. Low power systems are better suited to a PWM controller because: A PWM controller operates at a relatively constant harvesting efficiency regardless of the size of the array. In the 555 IC circuit there is a capacitor connected to pins 6 and 2 as charge and discharge to the 555 IC, while the output can produce a PWM signal whose size is regulated via a potentiometer. as input connected to the user ( manual control ) .. In the 555 IC circuit there is a capacitor connected to pins 6 and 2 as charge and discharge to the 555 IC, while the output can produce a PWM signal whose size is regulated via a potentiometer. as input connected to the user ( manual control ) . the strobe lamp is activated via a pulse issued by IC 555 at pin 3 . Pulse-width modulation (PWM), or pulse-duration modulation (PDM), is a technique used to encode a message into a pulsing signal. It is a type of modulation. Although this modulation technique can be used to encode information for transmission, its main use is to allow the control of the power supplied to electrical devices, especially to inertial loads such as motors and Lamp ( LED ) . LED dimmers allow the PWM frequency to be set. Most sources recommend min.500Hz and an upper limit in the low kHz range. The lower limit can be explained simply by the human eye, which can detect frequencies up to about 70Hz by flickering .
The average value of voltage (and current) fed to the load is controlled by turning the switch between supply and load on and off at a fast rate. The longer the switch is on compared to the off periods, the higher the total power supplied to the load.
However note the PWM switching frequency has to be much higher than what would affect the load (th
e device that uses the power), which is to say that the resultant waveform perceived by the load must be as smooth as possible.