Circuit Monitor 2 - PIC Project This is a circuit monitoring device. It runs for over 10 days and can log up to 32k events both digital and analog. Samples are logged either on a timing basis (.01 to 2.5 seconds) , or on a triggered basis. Four inputs are provided, up to three of which can be analog __ Designed by Luhan Monat - Mesa Arizona Circuit programs Atmel AVR microcontrollers - 30-Mar-00 EDN-Design Ideas - Atmel AVR mCs feature an enhanced RISC architecture that purportedly offer the highest MIPS-per-milliwatt capability in the 8-bit mC market. Figure 1 shows an easy-to-build AVR mC-programming circuit that can program the 40-pin AT90S4414/8515, the 20-pin AT 90S1200/2313,PDF has many circuits, scroll to this one Design by Guo-Yin Xu, XuMicro, Houston, TX
Circuit provides 4- to 20-mA loop for microcontrollers - 05/27/04 EDN-Design Ideas - The 4- to 20-mA current loop is ubiquitous in the world of controls in manufacturing plants. Discrete logic, microprocessors, and microcontrollers easily cover the digital portions of control schemes, such as limit switches, pushbuttons, and signal lights. Interfacing a 4- to 20-mA output to a rudimentary microcontroller can be problematic Design by Robert Most, Dow Corning Corp, Auburn, MI
Circuit provides watchdog for microcontrollers - 12/26/02 EDN-Design Ideas - The watchdog circuit in Figure 1 uses a single NAND Schmitt-trigger IC. The circuit iscost-effective than dedicated, commercially available watchdog ICs. The circuit generates an active-high reset signal upon power-up and remains in a low state as long as the control input receives pulses. Whenever the pulsing at the control input stops, whether the circuit is in a high or a low state, th Design by VM Holla, Bangalore, India
Circuit translates a law to m law - 05/07/98 EDN-Design Ideas - (NOTE
: contains several ideas, scroll down) Two common methods exist to compand voice for transmission through a PCM channel. In Europe, A law involves converting a 12-bit input signal to an 8-bit encoded output. In the US, m law involves encoding 13 bits to 8 bits. You can use a translator to convert from A law to m law (Figure 1) . The converter is asynchronous and requires only an 8-bit A law input to provide an 8-bit m law output. Design by Rolando Herrero, Instituto Tecnológico de Buenos Aires, Argentina
Clock Controller using AT89C2051 - The Clock Controller V1.1was designed to be an exemplary of using 'C' language to control timer0interrupt, 7-segment LED and keypad scanning. It provides 1-bit sink currentdriving output, for driving a relay, opto-TRIAC, say. Many projects requiring7-segment display and keypad interfacing may get the idea from the Clockcircuit and software. __ Designed by Wichit Sirichote
Closed-Caption Decoder - This is a closed-caption decoder with serial output based on a Microchip PIC16F628A. The internal comparators of the PIC16F628A are used to implement a peak detector and data slicer __ Designed by The hardware was Richard Ottosen, and the firmware was Eric Smith
Cockroach Zapper - Using a PIC for this device provides a lot of useful functionality. The timing for the power pulse to the inductor is critical to getting the best Zap from your nine volt battery. The longer the current is on, the higher the voltage. Once the inductor reaches saturation, however, you are just waisting power. __ Designed by Luhan Monat-Mesa Arizona
Color Organ - This is a simple, one lamp colour organ. It is far less complicated then the Three Channel Colour Organ. It is simply a lamp controlled by an SCR. It can be built in a few minutes, and combined with other circuits to make some pretty neat effects. __ Designed by Aaron Cake
Color Organ - PIC Project This unit uses a PIC16F84 with an 8 bit A/D. The signal from both stereo channels is combined and digitized. Each of 5 frequency bands is processed using a 16 point FFT. Then the level of each channel is output as PWM (pulse width modulation) to a set of solid state relays __ Designed by Luhan Monat - Mesa Arizona
Colour (Sound) Organ - This is a simple, one lamp
color organ. It is far less complicated then the Three Channel Colour Organ. It is simply a lamp controlled by an SCR. It can be built in a few minutes, and combined with other circuits to make some pretty neat effects. __ Designed by Aaron Cake
Colour Bar Generator - I started this project 3 weeks ago, because I was wondering " is that possible, some AVR MCU to create simple colour bars? " At the beginning, I believed that it's easy. So, I asked some people who knew more about PAL composite video signal. The first idea was to work with 8.867238 MHz crystal (2 times the color carrier) . When I read about PAL video composite signal creation, I saw that if you want to product colors entire-in-software you must create the color-carrier (4.43 MHz) , changing 4 times the phase of color-carrier (one time for each color) , to show 4 colours. Except that, you have to change the color-burst from 135 deg to 135+90= 225 deg. __ Designed by Vassilis Serasidis; Improved Zdenek Zechovsky
Colour Maximite Microcomputer, Pt.1 - The original Maximite microcomputer (March-May 2011) has been a huge hit with readers and thousands are now in use all over the world, from Australia to Russia. So how do you improve on such a big hit? How about by adding eight vibrant colours and a stereo music synthesiser for a start? The result is stunning and it takes the Maximite to a whole new level.__ SiliconChip
Colour Maximite Microcomputer, Pt.2 - Building the unit and using its new sound & colour features__ SiliconChip
COM Port Laser Turret - Steer a laser turret from your PC. |