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Programming adaptor for 8 and 28 pin
AVR Microcontrollers using ISP - Okit is not pretty, but its
practical. The 20 pin connector at the far right is left over from a different project and is no longer
used. This adaptor lets me program 8 or 20 pin DIP devices using the In-System Programmer (ISP) described in
Atmel's AVR910 application note. This circuit provides power and clocks for the part to be programmed and
power to the ISP circuit. When programming 8 pin devices, the part is positioned toward pins 1 and 20 of the
socket such that the 8 pins of the chip occupy the pins 1, 2, 3, 4, 17, 18, 19, abd 20 of the programming
socket. In the case of an 8 pin part being programmed, the SPST switch that grounds pin 4 must to be closed.
Conversely, when programming a 20 pint part, the switch on pin 4 must be open so the crystal can be used for
the clock for the part being programmed. . . [From Dick Cappels' project pages]
Programming Baseline Flash Devices with Pickit 1 - Application Note Published 16-Feb-05. . . [Microchip]
Programming Pulse Generators for Flash Memories - DN17 Design Notes (Linear Technology) . . . [Linear Technology]
Programming the Pocket PC Os for Embedded IR Applications - Application Note Published 20-Apr-04. . . [Microchip]
Programming Windows Xp® for Embedded IR Applications - Application Note Published 27-Jul-04. . . [Microchip]
Programs Atmel AVR µcs - 03/30/00 EDN Design Idea 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 AT9. . . [by Guo-Yin Xu, XuMicro,
Houston, TX]
Programs Atmel AVR Microcontrollers - 03/30/00 EDN Design Idea 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 AT9. . . [by Guo-Yin Xu, XuMicro,
Houston, TX]
Propeller
Message Display with Temperature Indicator - Here we
describe a microcontroller-based propeller display that displays any message sent to it via hyper-terminal of
a personal computer. Moreover, a temperature sensing IC (TMP125) is mounted onto the propeller display to
display temperature in real time. It gives a 360-degree view and displays several characters in a revolving
circular path using just eight LEDs. The main highlight o this project is a vertical facing display with true
360-degree viewing angle. . . [© EFY Enterprises Pvt. Ltd. All rights reserved.]
Propeller clock
PIC16F84 - A few light emitting diodes spin, precisely
controlled by a PIC microprocessor, giving the illusion of a larger array. . . [Bob Blick's design]
Protecting from ESD - MicroNote 109 Emphasizes the fast, sub-nanosecond rise-time of static discharge and the need
for low parasitic inductance in protective devices and requirements for shielding where applicable. . .
[Microsemi Corp]
prototype
board-Atmel 89C2051 - This single sided proto board
provides an economical solution for developing and testing the projects around Atmel 20 pin series
u-controllers (89Cx051 & AVR). . . [by M Asim Khan asimkhan @ sat.net.pk]
Provide digital hysteresis - 12/03/98 EDN Design Idea (File has several circuit ideas. Scroll to find this one. ) It is
sometimes useful to have hysteresis in a digital circuit—for example, in a power circuit under the control of
a manual pulse generator, in which mechanical vibrations can produce position errors. The circuit in Figure
1, which consists of a 4585 comparator (IC2) , a 4019 switch (IC1) , and one-sixth of a 4069 inverter (IC3) ,
provides digital hysteresis. If DI=0, DA=8, and DB=6, then Output 12 and G2 of IC2 assume logic 1, and G1 of
IC2 assumes logic 0. . . [by W Dijkstra, Waalre, The Netherlands]
Provide Watchdog for Microcontrollers - 12/26/02 EDN Design Idea 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 I. . . [by VM Holla, Bangalore,
India]
Provides Watchdog for Microcontrollers - 12/26/02 EDN Design Idea 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 I. . . [by VM Holla, Bangalore,
India]
Push Button Switch
Debouncer - This circuit will remove the transient
spikes and contact bounces from a non-latching push button switch. . . [Andy Collison's website]
Pushbutton or logic controls nonvolatile DAC - 11/19/98
EDN Design Idea (File has several designs) For manual control of analog signals, it's hard to beat the
venerable precision multiturn potentiometer's simplicity, resolution, and power-off nonvolatility. When
digital control of an analog parameter is the design objective, a universe of DACs is available to the
designer. The circuit in Figure 1, however, has manual-pushbutton and CMOS/TTL-compatible digital interfaces
to a 10-bit, nonvolatile, two- or four-quadrant multiplying DAC. The heart of the circuit is the Xicor
(Milpitas, CA) X9511 PushPot series of digitally controlled potentiometers. . . [by Stephen Woodward,
University of North Carolina, Chapel Hill, NC]
Pushbuttons and digital potentiometer control boost converter - 02/17/05 EDN Design Idea Digitally controlled potentiometers are useful for generating
analog control voltages under the control of a microcontroller. In some applications, manual pushbutton
switches could replace a microcontroller and simplify product des. . . [by Simon Bramble, Maxim Integrated
Products Inc, Wokingham, UK]
PWM Motor Control - PIC Project This device acts as a variable speed control for the heater blower in a car. It
takes its power directly from the existing wiring and connects with just 2 wires. It will also work for any
12 volt device up to 10 Amps. . . [Luhan Monat - Mesa Arizona]
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