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PIC / ATMEL / AVR
Accurate Digital LC Meter
Most accurate and simplest LC inductance / capacitance Meter that you will find. It allows you to measure incredibly small inductances starting from 10nH to 1000nH, 1uH to 1000uH, 1mH to 100mH and capacitance from 0.1pF up to 900nF. The circuit uses an auto ranging system so that way you do not need to spend time to select the ranges manually.
PIC Dual Temperature Meter
Dual PIC Temperature meter that allows to measure temperature in two different locations at the same time. Never before such a useful and powerful circuit could be built with so little components and yet provide endless possibilities. This is all possible thanks to the use of PIC16F628 microcontroller and 2x16 character LCD display that act like a small computer which can be customizable thanks to upgradeable hex firmware.
USB IO Board with PIC18F2455 / PIC18F2550
USB Input / Output Board is a spectacular little development board / parallel port replacement featuring PIC18F2455 / PIC18F2550 microcontroller. USB IO Board is compatibile with Windows / Mac OSX / Linux computers. When attached to Windows IO board will show up as RS232 COM port. You can control 16 individual microcontroller I/O pins by sending simple serial commands. USB Input / Output Board is self-powered by USB port and can provide up to 500mA for electronic projects.
These are examples of what can be built using USB IO Board:
USB Relay Controller (turn ON/OFF lights or appliances in the house)
Control LEDs, toys, electronic gadgets, wireless control, etc.
USB LCD Controller
USB Volt / Ampere / Wattage Meter
USB CNC Controller
USB Data Logger
USB Temperature Meter / Logger
USB Humidity Meter / Logger
USB Stepper Motor Controller
USB RC Servo Controller
This simple AVR Programmer will allow you to painlessly transfer hex program to most ATMEL AVR microcontrollers without sacrificing your budget and time. It is more reliable than most other simple AVR programmers available out there and can be built in very short amount of time.
FT232RL USB to Serial Adapter for PIC AVR ATMEGA ARDUINO MCUs
FT232RL USB to Serial UART (TTL) Adapter is a simple and inexpensive way to connect PIC, AVR or ATMEGA MCUs to a PC or Mac via USB connection. FT232RL is an impressive chip because it implements full v2.0 USB protocol, needs no external crystal, has integrated EEPROM for device ID and product description strings and comes with Royalty-Free driver support for Windows, Linux, and Mac OSX. FT232RL chip provides two data lines RXD and TXD that are connected through 1K resistors to a microcontroller such as PIC AVR ATMEGA ARDUINO. Up to 500mA of +5V power can be obtained from USB port and used to power both FT232RL chip and your favourite MCU. When connected to a PC FT232RL is mounted and shows as Virtual COM port in Device Manager making it easy to send and receive data from PIC, AVR or ATMEGA microcontrollers.
0 - 5V PIC Voltmeter
0 - 5V PIC voltmeter circuit consists only of a PIC16F876 (or other 16F87x), a 10-MHz oscillator and a dot-matrix displa y. The analog voltage is fed to the PIC RA0 ind. To show the 10 Bittig measured ADC value is 4 digits on the LCD shown in decimal (in millivolts).
2.5 GHz Frequency counter
This project describes a very powerful frequency counter.
Very simple construction which everyone can build.
6 LED display will present the frequency with 1kHz resolution and
RS232 communication to computer is available as option.
The software has also been implemented with some smart functions,
for calculating frequencies in receivers where IF is 455kHz or 10.7MHz.
I present schematic, PCB, components and window software.
3 Digits Digital Volt Meter with PIC16F676
This is simple 3-digits digital volt meter.PIC16F676 used to read analog signal(voltage) and display the value on 3-digits 7-segment. You can apply similar principles to measure DC current with parallel R shunt.
4 Channel PIC Based RS485 Multiplexer
Recently, I had to design a circuit real quick that transmitted 4 parallel TTL data bits over 350m of twisted pair cable. I needed to feed in four parallel data bits at one end, and get 4 parallel data bits out the other end, completely transparent to the transmitting and receiving circuits.
60 Minute Count Down Timer
Here is a 60 minute countdown timer that can be used as an exposure timer for UV light boxes, photography, egg timer, and many other projects where counting or delay is necessary. The heart of the countdown timer is PIC16F84A chip and 4 digit character LED display. The relay is energized after the count down timer goes down from specified minute and second until zero.