Free Tech

DIY Project Plans, Software Libraries, and Reference Designs

Fearless Night Bicycle Headlight and Cyclometer
Features: 20, 35, or 50 Watts of headlight power, Automatic headlight brightness with manual dim, Color graphics dashboard display, Speedometer, distance, temperature, and more. Rechargable Li-Ion battery system, One button controls all functions.
More info
WF-1000 Flashlight Modifications
Features: A much better control method, 3 brightness levels (superdim, dim, maximum) with memory, a nicer overheat mode, Li-Ion battery protection, and best of all no "strobe" mode.
More info
Li-Ion Battery Analyzer
A battery charger/analyzer for single cell Li-Ion batteries.
More info
3pi Robot Ni-Mh Battery Charger
A failsafe Ni-Mh battery charger for the Polou 3pi/m3pi robot.
More info
SpikenzieLabs Dice Kit - Mods Information
Modify your SpikenzieLabs Dice Kit to improve the brightness, sensitivity, and functionality. Presented here is information about possible hardware modifications, alternative firmware, and source code that you can modify.
More info
IR Light Level Meter
Digital and analog IR (Infrared) light level meters.
More info
VU Meter
Stereo bar-graph VU meter.
Shows instaineous and peak signal levels in 3 colors.
Automatic brightness control.
Single joystick button controls all functions.
More info
Geophone Display
Geophone (seismic sensor) amplifier and display.
More info
Colorganic Spectralizer Bargraph Mod
A modification for the Colorganic Spectralizer to drive LED bar graph type displays.
More info
FingerPass Password Device
FingerPass identifies a fingerprint, looks up a corresponding password, and automatically types it into the PC for you. Up to 20 distinct fingerprints can be stored, so each of your fingers and toes can be used for a different password. And the string doesn't have to be a password; it could be any arbitrary string up to 63 characters long, so it could be used to enter commonly used phrases without having to type them over and over.
More info
Caller ID / Automatic Call Screener
A caller ID display with caller database and automatic screening capabilities.
More info
DIY X-10 AC Power Sensor
Monitors any AC powered device and transmits an X-10 signal to indicate the device state (on or off).
More info
CMOS Digital Logic Probe
Features: Handy CMOS Digital Logic Probe, Input Voltage Range: 3.0 to 5.0 VDC, Input Frequency Range: DC to 20 MHz, Pulse Indicator LED.
More info
SumoBot Battle Robot
Kill, Krush, Destroy!
Written for the Mark III Robot (available from junun.org). This is an enhanced version of the PIC16F877 assembler program that controls the robot.  The embedded logic includes search mode, lock-on and charge mode, and arena edge avoidance strategies.  The hardware is a stock Mark III kit, and you can add a pair of two-color LEDS for eyes if desired.
More info
Abalone Game [PC Version]
It's a classic game.

Hint - Never give up control of the center of the board!
More info
Rainbow Circular LED Clock
More like a work of art than a just a clock, the time is shown by rings of different colored LEDs. The inner 2 rings tell the hour and AM/PM, the outer ring tells the minute, an intermediate ring acts as the sweep second hand, and the center blinks at a 1 second rate. At mignight it goes a little crazy too.
More info
Starburst Circular LED Clock
More like a work of art than a just a clock, the time is shown by rings of different colored LEDs. The inner 2 rings tell the hour and AM/PM, the outer ring tells the minute, an intermediate ring acts as the sweep second hand, and the center blinks at a 1 second rate. At mignight it goes a little crazy too.
More info
Digital LED Clock (Green)
Features: Automatic NIST time (GPS) synchronization, date & time digital desk clock, 0.56" LED display, automatic brightness control with adjustable settings, simple operation with a single control switch, IR remote control, power failure backup, and 9' foot power cord.
More info
LED Runner Chip
A 10 LED sequencer with ten different patterns. The specific pattern may be chosen or the patterns can be randomly displayed.
More info
10 Bit Serial Controlled I/O Chip
A serially controlled ten bit general purpose I/O port that provides up to 10 digital inputs, 9 digital outputs, and 3 analog inputs. All port functions are controlled by ASCII host commands. Inputs are configurable to use TTL or CMOS levels with optional pull-up. Outputs can be set to toggle at rates from 10 Hz to 0.05 Hz. The port setup can be stored in non-volatile memory.
More info
Beeper Chip
Multiple mode sound generator chip. Eight modes including tones at 322 Hz, 500 Hz, 1000 Hz, 2500 Hz, plus two-tone alarm, 500 Hz beeper, 2 KHz beeper, and sweep siren. Includes a master enable input.
More info
Debouncer Chip
A simple 2-input switch debouncer.
More info
IR Receiver Chip
IR Decoder for SIRC and/or RC5 remote control formats. Outputs data to a 9600 Baud asynchronous serial and/or a high speed SPI digital interface.
More info
IR Transmitter Chip
IR Encoder for SIRC and/or RC5 remote control formats. Input can be from a 9600 Baud asynchronous serial and/or a high speed SPI digital interface.
More info
UART to SPI Bridge Chip
An application-specific chip that bridges an asynchronous serial signal to a SPI (master) port.
More info
UART to SPI Bridge Chip
An application-specific chip that bridges an asynchronous serial signal to a SPI (slave) port.
More info
SPI to UART Bridge Chip
An application-specific chip that bridges a SPI port to an asynchronous serial signal.
More info
Not Logged In

Log In   Register
Search
Resources

Product Related Videos

Suppliers & Stores