Project Solutions (2011/08/12)

IR Multi-Position Switch

Published:2011/8/12 2:12:00 Author:Amy

Peter Verhoosel This multi-position switch is operated by the IR transmitter with HT12R described elsewhere in the issue. The signal transmitted by the transmitter enters the circuit through infrared detec­tor IC4. At the output the demodulated signal is available, that via R2 and Tl is routed to t...   (View)

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PICXEX18 AND PlCWIN8- Operating System and Monitor for PIC Microcontrollers （2）

Published:2011/8/12 1:44:00 Author:Phyllis

By Lourens le Grange In Figure 1 the operating system’s ’task activation code’ is a single CALL TASK_X instruction. This will have to be extended. Firstly we need to add a test to prevent a task from being activated if it is switched OFF. Secondly we must be able to change a task’s entry point during runtime, in which case a CALL instruction cannot be used as the destinatio...   (View)

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PIC18Flash development Board: Continuing where the＇16 series left off （3）

Published:2011/8/12 1:40:00 Author:Li xiao na

By Peter Moreton Uploading the demo firmware using IC-Prog Download the Elektor PIC18Flash demonstration firmware, file number 040010-11.zip from the Free Downloads page and unpack the zip file to a suitable folder. Connect a short parallel cable between the PC printer port and the PIC18Fiash MTSP port K4, run IC-Prog and select File, Open File, PIC18flash.hex. Now click...   (View)

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On-line Conversions

Published:2011/8/12 1:39:00 Author:Amy

Luc Lemmens From time to time you may come across a unit of measure that’s completely unfa­miliar. It also happens that the name sounds vaguely familiar, but you just can’t remember the fine points. Although the Internet probably contains numerous sites that can help out, the most comprehensive one is probably www.onlineconversion.com. Here you can convert physics quantities ...   (View)

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Voltage Monitor

Published:2011/8/12 1:28:00 Author:Amy

Paul Goosens It is often necessary to monitor the power supply voltage in a piece of equipment. When the device takes its power from a battery, the input voltage can change and provide an indication of how much energy is left. Even a device powered from the mains can benefit from keeping an eye on the (various...   (View)

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PICXEX18 AND PlCWIN8- Operating System and Monitor for PIC Microcontrollers （1）

Published:2011/8/12 1:20:00 Author:Phyllis

By Lourens le Grange This article describes the development of a multi-tasking operating system for the PIC1 8xxx microcontroller from Microchip. The code and RAM memory requirements are minimal and the basic idea straight forward, but it can simplify the implementation of an application on this microcontroller ...   (View)

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Thrifty 2-Hz Clock

Published:2011/8/12 1:13:00 Author:Amy

P.C. Hogenkamp CMOS circuits are known for their low current consumption. This is particularly important for battery-powered circuits. Unfortunately, oscillators often require quite a bit of current. We therefore pro­pose this osc...   (View)

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PIC18Flash development Board: Continuing where the＇16 series left off （2）

Published:2011/8/12 1:12:00 Author:Li xiao na

By Peter Moreton Introducing the MTSP programmer An important feature of the PICI8Flash system is the provision of onboard programming electronics. This enables the user to flash the microcontroller without having to remove the PIC from its socket and load it into a standalone programmer. In 1996, the ’Tait Classic’ programmer design was widely published, enabling th...   (View)

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Simple Audio Peak Detector

Published:2011/8/12 1:07:00 Author:Amy

Flemming Jensen This audio peak detector allows a pair of stereo channels to be monitored on a sin­gle LED. Identical circuitry is used in the left and right channels. Use is made of the switch­ing levels of Schmitt t...   (View)

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EQUATIONS, EQUATIONS-Calculate and convert

Published:2011/8/12 0:58:00 Author:Phyllis

By Harry Baggen Electronics is not always plain sailing. Although a small circuit can be built quickly without jotting down complex formulas, a deeper or more theoretical approach soon calls for equations and basic maths. There is no need however to know everything from the top of your head as the Internet is available to assist. Electronics can be downright easy... but also horrend...   (View)

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IIR Too

Published:2011/8/12 0:51:00 Author:Amy

Paul Goossens In the digital domain, analogue signals can be easily manipulated without requir­ing different hardware for each operation (as is necessary for analogue circuits). Other important advantages are that no noise is added during the operation (pro­vided it is programmed correctly) and that mathematical algorithms are easier to implement. Unfortunately, the...   (View)

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PIC18 Flash development Board: Continuing where the＇16 series left off （1）

Published:2011/8/12 0:49:00 Author:Li xiao na

By Peter Moreton The development system described in this article continues a fine tradition of Elektor Electronics microcontroller articles, and follows in the lineage of the popular PICee board, AVRee and others. The board described here employs the most recent and powerful of Microchip’s PIC family, the ’1 8F’ series, and specifically, the PIC18F452. The PIC18F4b2 has become ...   (View)

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