All posts in the 'Display projects' Category
The display is controlled by an Atmel AVR-family microcontroller, AT90S2313.The display has seven rows containing 50 LEDs each. The display controller consists of seven transistors and seven 8-bit shift registers which all are controlled by the MCU (AT90S2313). Each transistor drives one row selecting whether it’s enabled or not. The shift registers are chained together, so their serial input is converted to parallel output of 56 bits, 50 of which is used to drive the columns. The last six bits remain unused.[more]
It consists of two axes of motion. The first axis consists of a row of LEDs where the light moves back and forth (more on that in a minute). For the second axis we take that 1-D LED display and rock it back and forth like a pendulum on a simple bearing.[more]
This is a low power voltmeter circuit that can be used with alternative energy systems that run on 12 and 24 volt batteries. The voltmeter is an expanded scale type that indicates small voltage steps over the 10 to 16 volt range for 12 volt batteries and over the 22 to 32 volt range for 24 volt batteries. Power consumption can be as low as 14mw when operated from 12V and 160mw when operated from 24V.[more]
POV stands for Persistence Of Vision. Itโs a term that’s been applied to devices that rely on the eye’s tendency to continue to “see” an image for a short time after it has disappered. This is also what causes the apparent blurring of objects that are in motion (like an airplane propeller).This project consists of three circuit boards with a row of 32 LEDs on each .The circuit boards are mounted radially in the spokes of a bicycle wheel and batteries near the hub supply power to them. The LEDs are controlled by a microcontroller that measures the rotational speed of the wheel by way of a hall effect (magnetic) sensor. As the wheel rotates, the microcontroller turns the individual LEDs on and off in such a way that a static image appears to float inside the wheel.[more]
This PIC Based Imaging Sonar use two 40KHz ultrasonic transducers, one for transmit, one for receive. These transducers are steered by an R/C servo over 180 degrees of azimuth.The project using 2 Microchip PIC microcontrollers, a PIC16C71 for the sonar portion, and a PIC16F84 for the servo control. There are two microswitches that sense the ends of travel of the servos, and this information is stored in non-volatile memory on the PIC16F84. It can scan the full 180 degrees, or it will scan just a sector, or it will give multiple readings in a single direction. All control and output is over a single 19.2 Kbps serial port.[more]
