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. (propeller_posn==55)) 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 The first prototype was built using magnet wire for the spinning air-core transformer. 28 gauge wire was used in the handmade prototype. 28 gauge wire has a cross-sectional area roughly equal to a 1oz 100 mil wide PCB trace. The actual PCB used 10 mil wide trace for lower current by taking advantage of the ~4 ohm equivalent series resistance (ESR) of the PCB trace at the cost of lower power transfer to the secondary board. There are many ways to enhance this devise with many other added features. Or it could also be used for some other project as a basic component.

Before you begin to solder, you will need to cut 8 wires and strip both sides of each (only a small length needs to be stripped). Try to use your best judgement for how long each wire should be based on its distance from its digital pin and LED strand/pin. ATmega32A has an 8-Bit Processor and it has 32K of program space, 32 I/O peripherals. It runs up to 16MHz with external crystal. So, if someone is observing the images at least 16 frames per second, then they appear to be continuous. For example, if we want to display ‘1’, then the series of lighting up of LED s would be like bellow.Insert a Green LED into the holes with the long leg on the left side. Now from the copper side, bend its legs to one side (Green LED’s i.e. LED 12 – LED 16 via R12 to R16 and A5 to A1 respectively). According to above calculations, it can be interpret the radius is proportional to the rotation speed of LED s. Interrupts This devise displays only the time. Therefore we can modify this devise for display date besides time. Cut a piece of wire and strip both ends (small strip lengths). The wire should be long enough to connect the solder from step 3 to the top transistor solder/strand. This code will display RS232 ASCII transmissions from a PC and display a scrolling message board. The following picture shows an example "Hello World!" message, but it does no justice compared to the video below. The Arduino code could be modified to do things like the following:

The LED panel was mounted to motherboard as a separate module. Figure 9 shows the PCB layout of the daughter card and the list of components are found in the Appendix C. Here a major challenge that we faced is the connecting +5V supply to the rotating circuit. We tried the various methods to do that. But finally we choose a method, as shown in the above figure. The motor/secondary assembly can now be inserted into the base unit. It will be glued using a few drops of

Recommendations

The FSK modulator circuit shown above will function fine with RS232 either in the standard signaling format (-3 to -15V low, +3V to +15V high) or TTL levels (0V low, +3.3V to +5V high). The diode at the base of the transistor clamps the base of the transistor to ground to prevent negative signal voltages from causing damage to the transistor. I used the Schmitt buffer oscillator instead of a 555 timer because I anticipated a possible need to switch the transformer coil at > 500KHz, which is beyond the capabilities of the 555 timer. Also cheaper 555 timers actually tend to be 100KHz versions. if ((propeller_posn==0)