DENEST Retro Steampunk Wall Clock Decor Wall Air Plane Propeller Clock Ornament Design Industrial Wall Aviation Ornament for Cafe Bar (Have clock)

Product Information

The obvious solution to the DC motor problem is to use a brushless DC (BLDC) motor for quiet long-lasting operation. BLDC motors are commonplace in the quintessential PC fan that are everywhere and inexpensive. Unfortunately, trying to source a simple brushless DC motor by itself without any attachment to something else like fan blades, disk or CD drive turns out to not be as easy as I thought. I even considered the BLDC motors used in quadcopters, but those are designed for very high RPMs and require a separate motor controller that typically expects PWM. Furthermore, I did buy and play around with a quadcopter BLDC motor. It turns out that running a quadcopter BLDC motor at low RPM produces a high pitched whine, which is clearly unacceptable for a display that is not supposed to annoy everyone near it. In the end, I decided to use a 60x60mm PC fan as the motor and designed a base PCB around it.

The propeller display is in a way like LED Matrix. It contains 19 LEDs (Light Emitting Diodes) which are arranged in the form of an 19*1 matrix (19 rows and 1 column).LED module consisting of 10 bright red color LEDs and it is fixed in corner of the arm of the propeller. It is a main part of the circuit. LED module is used to displaying the characters and symbols. These 10 LEDs are connected with each pins of the port A and two pins of the port B of microcontroller. Phototransistor

Since the phototransistor is only triggered by the IR radiation, an IR LED must be placed nearby. The intensity of the IR radiation determines how much current is generated in the photo transistor. Therefore a large current must flow through the LED to create a higher intensity. Figure 3 shows an IR LED circuit.V DC voltage provided to Mother board using 9 V regulator circuit. User can plug a 9Vdc-24Vdc range DC power supply as the power source of Motor. Minimum 500mA and Maximum 1000 mA current supply must provide to Motor to get a proper rotation speed. Now, Mount the whole project to a chipboard with the help of a toy DC motor. Keep in mind that if you use a powerful motor for high speed, you may use a 9V to 12V battery instead.