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

Product Information

On the front, This pin will connect to the last LED. For easy reference, when flipped over each digital pin connects to its closest positive LED strand/pin. This is how the LED's will be soldered to their respective Digital Pin. It's a bit confusing to explain but very easy to follow if you look at the picture.

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). if ((propeller_posn==0) Flip the pixelmap for the message board to be readable at the top or bottom (there is a #define constant already in code to select). Flip the pixelmap for the time to be readable at the top or bottom (there is a #define constant already in code to select).

Version 4 (August 2014)

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:

tape, which no longer serve any purpose. You will now be able to hold the inner layer in place with a few spots of glue. This devise can be modifying as a computer based display board. A wireless system can be used to communicate between the PC and the device. This would let the user to display any massage easily on propeller display.Now insert the resistors and bend its leads the same as you did for LED’s. Cut the extra leads accordingly. (propeller_posn==35)

Version 1.1: povLedTimeDisplay1.1.ino - Added pushbutton support to update the time and leading 10 hour digit 0 will be hidden. 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. An Infrared LED (IR), also known as Infrared transmitter, is a special purpose LED that transmits infrared rays with nanometer range of wavelength. IR transmitters along with IR receivers are commonly used as sensors. The appearance is same as a most common LEDs. (propeller_posn==5) The transformer primary will then be glued to the board on the other side, around the motor. Before (propeller_posn==30) (propeller_posn==15) (propeller_posn==20) 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.

(propeller_posn==40) delayMicroseconds(100); // for LED pixel width (change the value according to motor speed. Increase for low speed, decrease for high speed motor)

For the POV display, I decided to modernize a little and use an ATMega328 with the Arduino Uno bootloader and program it using Arduino code. Writing Arduino code in C code style is way easier than writing, deciphering, and debugging PIC assembly! Granted, I did not write most of the PIC assembly code for the first 3 versions, but they were not necessarily easy to understand and modify. Furthermore, the Arduino supports an UART so I was very interested in the idea of transmitting RS232 to the Arduino on the spinning POV board for all types of purposes including a live message board or possibly a pixel graphics display controlled by a PC or setting/resetting the time over RS232. Several POV display examples I have seen used an IR remote for changing display modes. To transmit messages, a radio like the Zigbee is typically used. I was more interested in something more basic and inexpensive so I looked into rolling my own RF transmitter/receiver since RS232 is very simple and only needs to be transmitted from the stationary base to a spinning board with an antenna at most a few inches away. While looking into the radio design details, I was worried about trying to detect a weak RF signal in the presence of a large interferer caused by the switching frequency of the air-core spinning transformer. I had my eureka moment when I realized that all I really care about is transmitting RS232 in one direction. That pesky transformer switching frequency noise could be made meaningful to send RS232 bits by shifting the frequency around! I designed a basic Frequency Shift Keying (FSK) design where a logic 0 or 1 is represented by 2 different transformer switching frequencies as shown in the diagram below. Note that the inverters are Schmitt buffers, which is required for oscillation due to the hysteresis on the input switching thresholds. Repeated scanning of the display is necessary for continuous vision of image. This task is achieved using continuous circular rotation of the whole circuit assembly. Therefore a DC motor has used as the prime mover.