Rickard have designed the hardware of the PIC video game system to be able to run several different kinds of games. It has two standard C64/Amiga/Atari joysticks and video and audio output. The processor is a PIC16F84 running at 12MHz and generates both video (PAL and NTSC) and audio in software. The hardware design is [...]
This circuit is used to control a total of three independent processes:
Generating video signal
Revenue characters from the keyboard, decoding and sending to the serial line
Revenue characters from the serial line and store into memory for display
Source: Pandatron
Universal tester of semiconductor components with detection and simple control detects an unknown component and its basic parameters.
Currently supports the following devices: Transistors type NPN, PNP, N-MOS, PE-MOS, ND-MOS, PD-MOS, N-JFET and P-JFET.
Source:Pandatron
The following construction has just two features ideal for basic testing and troubleshooting on audio devices.
Here low-frequency generator of structure / trackers offers the following uses: In function generator allows the injection of low-frequency signals in the way of audio devices such as amplifiers.Contrast,in low-frequency trackers feature allows you to listen to any low-frequency audio [...]
This device is fully functional sound card for PC. The main advantage of using PCM2704 against PCM2702 is much easier construction. The circuit can be powered directly from USB port.
Source: diy4fun
This is a very simple and easy to build programmer for Atmel microcontrollers from AVR family. The microcontrollers must support serial programming. This programmer is connected to a PC through the RS232 serial interface and can be used with the PonyProg or Avrdude software programmer.
Source: diy4fun
Yet another darkroom timer using a PIC 16F84A. All the functions are in firmware:
Lamp(s) light at start of timing and turn off when timer reaches zero.
A set of leds were added between the minute and second leds which blink during timer operation.
7 segment displays include tails for digits 6 and 9.
[...]
The light level can be adjusted with two push-buttons “Up” and “Down”. Controller in this application is PIC16F84 that drives BUZ11 mosfet. Dimmer is tested with a light bulb 12V/4W and mosftet didn’t get even warm (which was expected since the datasheet says: 50V/30A).
Source: Elektronika.ba (niho)
Forum post: Digital light dimmer
This small circuit is very simple to make,with only few components caps, resistors and the heart of this circuit is Attiny84 microcontroller running at 20MHz.
Source: 5volt
I needed a solution to remotely turn on a computer. There are many hardware devices you can buy, but I thought Wake on LAN (WOL) would be the ideal solution and give me a chance to experiment with Microchips ENC28J60 Ethernet controller chip. WOL is a computer networking standard that allows a [...]
This project shows the temperature on a three digit 7-segment display, it measures the temperature from -9.5 to 99 degrees Celcius in 0.5 C steps, or from 0 to 210 degrees Fahrenheit in 1.0 degrees steps. Because of the LED display the temperature is also readable in the dark.
The TCN75 from MicroChip is used to [...]
This project allows instant start sequentially but a dozen low-voltage lamps 12 V / 60 W, and makes them fade and always sequentially (but slower). This system has been designed to meet the demand of a visitor who wanted ten recessed low voltage spot in a driveway to his house, with the following function: – [...]
This circuit allows switching on a LED when the battery voltage (12V) drops below a certain threshold. The operating system is based on a comparison of tension, which comes in a zener diode. If the supply voltage is 12V and the zener diode is a 10V model (this is the case in the diagram), we [...]
This is a good looking and practical device that can be useful in many areas where countdown timer is needed. This project is based on the PIC16F84A microcontroller. The time range can be adjusted between 1 and 999 seconds. This project has 3 buttons and one of them is named Set Button. In order to [...]
A VU meter is often included in audio equipment to display a signal level in Volume Units; the device is sometimes also called volume indicator (VI). In this project we are building a basic and low cost LED VU Metre circuit . The extent (range) display is -18 dBu to +3 dBu, spread over [...]
Today we have a new category “Projects” and a new electronic project 12 Channel LED Chaser with PIC16F84A.
This project is based on the popular PIC16f84A micro-controller.The heart of this project LED chaser is the PIC16F84A PIC microcontroller.A 4MHz crystal and capacitors C1 and C2 22pf is used for providing clock pulses to the micro-controller. The [...]
