There are 201 circuit schematics available in this category. Click here for all circuit diagrams. Last circuit added on Thursday, 30 July 2015.

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CircuitCategoryDate AddedOK?Votes 
AT89C2051 serial COMs to LED driverMicrocontrollerApr 12, 20010
Serial to parallel converter using the AT89C2051MicrocontrollerJan 26, 20010
Simple CW Keyer based on Atmel ATtiny 2313Microcontroller 0
AT89C2051/4051scanning 7-segment display and keypadMicrocontrollerJan 26, 2001-1
AT89C2051/4051 Driving dot LEDMicrocontrollerJan 26, 20010
AT89C2051/4051stepper motor interfaceMicrocontrollerJan 26, 20010
AT89C2051/4051connecting dumb terminalMicrocontrollerJan 26, 20010
Motorola 68K SBC (single board computer)MicrocontrollerJun 20, 20040
8051 SBC (single board computer)MicrocontrollerJun 20, 20040
8051SBC V1.1MicrocontrollerMar 25, 20090
89S52 Project BoardMicrocontrollerMar 25, 20091
Using the AT89C4051 as a RTC (real-time clock)MicrocontrollerMar 25, 20090
Simple RS232C Level Converter using TransistorsMicrocontrollerJan 26, 20010
AVR ThermometerMicrocontrollerMar 25, 20090
Motorola 68HC11 evaluation boardMicrocontrollerJun 20, 2004-1
C-52 EVB Robot ControllerMicrocontrollerJan 26, 20010
Mains clock controller using AT89C2051MicrocontrollerJan 26, 20010
AT89C2051/4051 Easy-DownloaderMicrocontrollerJan 26, 20010
AT89C51/52/55 Easy-DownloaderMicrocontrollerJan 26, 20010
PIC16F84 miniature real-time controllerMicrocontrollerJan 26, 20011
Isolated RS232 for PIC16F84MicrocontrollerJan 26, 20010
PIC16F84 debugging terminalMicrocontrollerJan 26, 20010
MiniLOGGER V1.0MicrocontrollerJan 26, 20010
Analog datalogger based on T89C51RD2MicrocontrollerJun 20, 20040
MTK-85 8085 Microprocessor Training KitMicrocontrollerMar 25, 20090
PIC18F2550 Project BoardMicrocontrollerMar 25, 20090
Atmel 89C2051 prototype boardMicrocontrollerJun 20, 20041
AT89C2051 real-time controllerMicrocontrollerJan 26, 20010
PIC12C508 Night-light saverMicrocontrollerJan 26, 20011
AT89C2051 Night light saverMicrocontrollerJan 26, 20010
AT89Sxx Cheap and Simple Learning BoardMicrocontrollerMar 25, 20090
AT89C2051 Digital thermometer and clockMicrocontrollerJan 26, 20011
Tiny 2313 Project Development BoardMicrocontrollerMar 25, 20090
4-Channel Timer using Atmel 89C4051 and MAX7219 display driverMicrocontrollerJun 20, 20041
PIC16F628 controlled FLL (Frequency Locked Loop) VFO for HF (PDF)MicrocontrollerOct 05, 20091
PIC16F84 CW decoder (PDF)MicrocontrollerJul 10, 20020
Atmel AVR ATtiny45 development boardMicrocontrollerJun 28, 20110
AVR thermometer / thermostat based on an Atmel ATtiny2313MicrocontrollerJun 28, 20110
Serial LCD controller using a PIC16F628Microcontroller 1
Microprocessor based home security systemMicrocontrollerOct 25, 20140
Temperature Indicator Using AT89C52MicrocontrollerDec 07, 20140
PIC Light Chaser using PIC16C84Microcontroller 0
ADC conversion using ADC0804LCN and 8051Microcontroller 0
Build a PIC controlled DDS VFO, 0 to 6 MHzMicrocontrollerJul 12, 20010
Iambic keyer based on a PIC16F84 or PIC16C84MicrocontrollerJun 19, 20110
PIC18F4550 Development Board including PCB layout suitable for home etchingMicrocontrollerJun 19, 20110
PIC16F84 line following robotMicrocontrollerJan 26, 20010
PIC16C505 IR / wireless remote controlMicrocontrollerMar 23, 20030
DIY 2^16 encoder based on PICMicrocontrollerApr 12, 20140
Automatic door opener with PIC12C508MicrocontrollerMar 01, 20010
3-wire serial LCD interface for the PICMicrocontroller 0
RS485-like multi-drop bus with half duplex serial protocolMicrocontrollerMar 23, 20030
LCD thermometer using PIC16F871Microcontroller 0
Electronic irrigation controller based on PICMicrocontroller 0
'Almost No Parts' 7-segments 12/24 Hours LED clock with PIC 16F84A or 16F628AMicrocontrollerSep 25, 20090
A PIC-based "TDOA" RDF (radio direction finder) antenna unitMicrocontrollerApr 14, 20111
Singing Christmas tree based on Microchip PIC16F84MicrocontrollerOct 07, 20090
50 MHz frequency counter, voltage meter & SWR/PWR indicatorMicrocontrollerJul 12, 20010
Serial LCD Controller using Microchip PIC16F628Microcontroller 0
Dirt cheap video using a PIC16F819 microcontrollerMicrocontrollerMay 16, 20100
Talking fish hack using a PIC16F819 microcontrollerMicrocontrollerMay 16, 20100
SD card interface for PIC microcontroller including schematic and source codeMicrocontrollerMay 16, 20100
Speech Synthesizer Development System using a PIC microcontrollerMicrocontrollerMay 16, 20100
Touch senstor based on Atmel AT90S2313Microcontroller 0
LCD clock based on AVR Attiny2313Microcontroller 0
101 AT Keyboard to ASCII Decoder using 68HC705J1A MCUMicrocontrollerJan 26, 20010
PIXpand - TI calculator to Playstation memory card interfaceMicrocontrollerJul 12, 20010
90S2313 AVR Robot BoardMicrocontrollerMay 01, 20040
ATmega8 based TNC with GPS and WX supportMicrocontrollerMar 27, 20090
Atmel AVR 90s2313 based POCSAG encoder (ZIP file)MicrocontrollerMar 27, 20090
Atmel 90s2313 based TNCMicrocontrollerMar 27, 20090
ATmega48 based Nixie ClockMicrocontrollerMar 27, 20090
POCSAG encoder/decoder (Zip file)MicrocontrollerJul 10, 20020
Measuring Acceleration Using a PIC Microcontroller (ADXL202 + PIC16F84A)MicrocontrollerJan 09, 20100
PIC serial communications tutorial, includes circuit diagram and PIC16F84 assembler codeMicrocontrollerJan 09, 20100
Driving high-power loads with a microprocessorMicrocontroller 0
IDE interface to a Microchip PIC16F877 microcontrollerMicrocontroller 0
PIC sonar (ultrasonic) range finding project with seven segment display using PIC microMicrocontroller 1
A Real Time Clock IC (DS1307) project using the PIC microMicrocontroller 0
PIC Serial LCD project - An RS232 serial LCD interface using a standard HD44780 LCDMicrocontroller 0
Connect a Serial LCD Display to Raspberry PiMicrocontrollerMar 23, 20150
RS-232 to TTL TranslatorMicrocontroller 0
Serial port I/O interface using AVR microcontrollerMicrocontroller 0
MMC to PIC16F876 circuit diagramMicrocontrollerJun 18, 20030
Circuits for interfacing microcontrollers to a wide number of real-word interfacesMicrocontroller 0
Hardware Random Number Generator with an SX microcontrollerMicrocontroller 0
8088 maximum mode SBCMicrocontrollerNov 16, 20020
EZ80 single board computer schematic (Z80)MicrocontrollerApr 27, 20030
8051 Development System Circuit Board circuit diagramMicrocontrollerJun 20, 20040
Long-period watchdog timerMicrocontrollerJan 26, 20010
PIC Web Server SchematicMicrocontrollerSep 13, 20060
IR On/Off Switch Using a PIC12F629 MicrocontrollerMicrocontrollerNov 13, 20100
PIC ICDMicrocontrollerOct 23, 20020
PIC Project #1 - RS232 to I2C InterfaceMicrocontrollerJan 26, 20010
Using an ADXL330 accelerometer with an AVR microcontrollerMicrocontrollerJan 09, 20100
Ultrasonic Distance Measurer based on Freescale MC9RS08KA2 (PDF)Microcontroller 0
Asynchronous 40-bit TTL CPUMicrocontrollerAug 18, 20090
AVR-Based Serial Port IR ReceiverMicrocontrollerOct 23, 20020
SPI2CF, a fast and efficient WLAN interface for the AVRMicrocontroller 0
10 tricks for interfacing to the PIC16C508MicrocontrollerNov 05, 20090
Speech recognition using HM2007MicrocontrollerNov 29, 20020
PIC microcontroller servo motor interfaceMicrocontrollerNov 29, 20020
PIC micro multiple servo motor interfaceMicrocontrollerNov 29, 20020
GPS LCD Display ProjectMicrocontrollerJul 24, 20020
PIC16F84 LED chaserMicrocontrollerNov 17, 20020
PIC micro LED projectsMicrocontrollerJun 18, 20030
PS/2 keyboard keystroke logger based on Atmel 89C2051MicrocontrollerJun 20, 20040
6502 Microprocessor KitMicrocontrollerMay 19, 20150
68k Single Board ComputerMicrocontrollerMay 19, 20150
AT89C4051based digital clock with 16x2 LCDMicrocontrollerMay 19, 20150
Digital Clock with Alarm Using DS1307MicrocontrollerMay 19, 20150
Realtime Clock with LCD based on an Atmel AT89C4051MicrocontrollerApr 22, 20140
AVR thermometer using AT90S2313 and DS1820MicrocontrollerMay 19, 20150
HC-11 Evaluation BoardMicrocontrollerMay 19, 20150
SBC built with 16-bit Intel Embedded Microprocessor, 80C186EBMicrocontrollerMay 19, 20150
16-bit microprocessor learning board based on Intel 80C188EB Embedded MicroprocessorMicrocontrollerMay 19, 20150
C-52 Evaluation Board based on a 89C52MicrocontrollerMay 19, 20150
C-52 Evaluation Board V2.0 based on a 89C52MicrocontrollerMay 19, 20150
C-52 Evaluation Board Robot ControllerMicrocontrollerMay 19, 20150
Cheap Loader Cable of Asim's ISP for 89S51 89S52MicrocontrollerMay 19, 20150
Electronic distance meter based on Motorola 68HC908QY4MicrocontrollerJun 20, 20040
Easy-Downloader V1.1 for ATMEL 89C2051/4051MicrocontrollerMay 19, 20150
Easy-Downloader V1.1 with SDCCMicrocontrollerMay 19, 20150
Atmel AVR ATMega 8535/16/32 and AT89S5x family learning kitMicrocontrollerJun 07, 20110
F84 simple real-time controller with PIC16F84 running at low powerMicrocontrollerMay 19, 20150
Fan timer based on Motorola 68HC908QT2MicrocontrollerJun 20, 20040
Isolated RS232C for PIC16F84 or other microcontrollersMicrocontrollerJun 19, 20110
Easy debugging serial terminal with LCD displayMicrocontrollerMay 19, 20150
AT89C2051 line-follower robotMicrocontrollerJan 26, 20010
M-Logger V1.0 based on PIC18F46J11 microcontroller and a DS1820 temperature sensorMicrocontrollerMay 19, 20150
MTK-85 8085 Microprocessor Training KitMicrocontrollerJun 07, 20110
In-Circuit PIC Loader (parallel port based)MicrocontrollerMay 19, 20150
PIC18F2550 Project BoardMicrocontrollerMay 19, 20150
Atmel 89C2051prototyping boardMicrocontrollerApr 22, 20140
S-52 Simple Learning Board using Atmel AT89S52MicrocontrollerMay 19, 20150
Night light saver (PIC12C508)MicrocontrollerJun 09, 20020
Thermistor Thermometer using 12-bit ADC, 89S52 and LED displayMicrocontrollerMay 19, 20150
Thermistor Thermometer: LCD versionMicrocontrollerMay 19, 20150
Tiny 2313 Project Development BoardMicrocontrollerJun 07, 20110
USB and GLCD expansion board for 8051 SBCMicrocontrollerJun 20, 20040
USB Easy-Downloader V5.0 for 89S52 and SST89E516RD chips with USB port connectionMicrocontrollerMay 19, 20150
Z80 Microprocessor KitMicrocontrollerMay 19, 20150
Microcontroller sensor and actuator interfacesMicrocontrollerApr 27, 20030
Complete Design for Giant 8-foot LCD Counter (Zip file)MicrocontrollerMar 27, 20090
PIC12C509 logic gate replacement for nitrogen filler (ZIP file)MicrocontrollerMar 01, 20030
PIC demo boardMicrocontrollerOct 31, 20020
PIC12C509 Gym Timer (ZIP file)MicrocontrollerMar 01, 20030
PIC LCD and Keypad driverMicrocontrollerOct 31, 20020
PIC12C508 Phase Controller for 2kW heater (ZIP file)MicrocontrollerMar 01, 20030
PIC16F84 TRIAC / IGBT brightness phase controllerMicrocontrollerMar 01, 20030
PIC16F84 pulse monitor with date/time output (ZIP)MicrocontrollerMar 01, 20030
PIC based touch clock that demonstrates interfacing a PIC microcontroller to an LCD touch panelMicrocontrollerJun 27, 20100
A PIC16F84A Alarm ClockMicrocontrollerJun 27, 20100
A Voice Controlled LED Light Show using a VRStampMicrocontrollerJun 27, 20100
Cheap Ultrasonic Range Finder based on a PIC microcontrollerMicrocontrollerJun 27, 20100
Cheap Ultrasonic Range Finder based on PIC16F877A with a 8MHz crystalMicrocontroller 0
A PIC16F819 Dymoclock (also demonstrates interfacing 30 LEDs to a PIC using only six I/O pins)MicrocontrollerJun 27, 20100
EasyPic2 with on-board Ethernet AdapterMicrocontrollerJun 27, 20100
PIC micro to ISA bus interfaceMicrocontrollerApr 17, 20040
Linuxstamp general purpose processor module based on Atmel AT91RM9200Microcontroller 0
PC to microcontroller communications using power from the PC serial portMicrocontroller 0
Microchip PIC ICD (in-circuit debugger)MicrocontrollerJun 18, 20030
Variety of circuits for RS232 to TTL Signal ConversionMicrocontroller 0
Variety of circuits for TTL to RS232 Signal ConversionMicrocontroller 0
PicoWeb V5.1 (AT90S8515) tiny web serverMicrocontrollerJan 31, 20030
8051 Development System Circuit BoardMicrocontrollerSep 13, 20060
8051 Development System Circuit BoardMicrocontrollerOct 23, 20020
8051 Development System Circuit BoardMicrocontrollerAug 14, 20020
Microprocessor using Xilinx FPGAMicrocontrollerJun 20, 20040
Temperature controlled based on AT89CX051MicrocontrollerJan 26, 20010
I2C LCD interfaceMicrocontrollerMay 01, 20040
AFSK 1200 Modem based on PIC16C620MicrocontrollerJul 10, 20020
PicCon - Hidden Radio Transmitter ControllerMicrocontrollerJul 10, 20020
PIC16F84 tone generator with source codeMicrocontrollerMar 01, 20030
PIC16F84 tone generatorMicrocontrollerJul 10, 20020
PIC16F84 tone generator (6-Bit)MicrocontrollerJul 10, 20020
CASIO datalogger system based around Microchip PIC microcontrollerMicrocontroller 0
Scriptable thermometer / thermometric controller based around a COP8-CCR9-PLC44 microcontrollerMicrocontroller 0
Cypress PSoC based digital wallet to record secret codes and passwords securelyMicrocontroller 0
RS232 interfaced DVM using a PIC12F675 including source code for CCS C CompilerMicrocontrollerSep 09, 20090
8049 Spy - read the internal ROM contents of a 8048 or 8049 processorMicrocontrollerSep 25, 20090
6802 Nano computerMicrocontrollerSep 25, 20090
AVR STK200/STK300 ISP Dongle circuit diagramMicrocontrollerSep 25, 20090
Tiny Eprom SimulatorMicrocontrollerSep 25, 20090
ScanMate audio activated recordedMicrocontrollerJan 26, 20010
Connecting AT90S2313 with LCD display 2x16 char and 4x4 keypadMicrocontrollerApr 17, 20040
Electronic safety lock based on ATtiny26MicrocontrollerApr 17, 20040
128x64 LCD Driver for AT90S2313 (ZIP file)MicrocontrollerApr 17, 20040
Connecting LED to PIC Micro I/O pins (PDF)MicrocontrollerNov 17, 20020
Microprocessor RS-232 ResetMicrocontrollerSep 21, 20060
AT90S8515 experimenter boardMicrocontrollerNov 27, 20020
Ultrasonic Distance Measurement With the MSP430 (PDF)Microcontroller 1
TTL to RS232 adapter using 2N3906 / 2N3904 transistorsMicrocontroller 0
PIC16F876 DataloggerMicrocontrollerJul 24, 20020
WLoader - PIC16F877 application loader / bootloaderMicrocontrollerMay 01, 20040
Poor man's analog to digital converter (ADC) using a 2N222 transistor and a few passives (PDF)Microcontroller 0
Nixie clock (PIC16F876)MicrocontrollerJun 18, 20030
Atmel Mega88 Dual Temperatur meterMicrocontroller 0
Atmel Mega88 Temperatur meter, Type K sensor, Heat set and regulatorMicrocontroller 0
Darkroom timer using PIC16F84AMicrocontrollerMar 07, 20090
Mini dice - PIC10F200-based electronic diceMicrocontrollerJun 28, 20152