Project Solutions

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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Flickering Light Ⅱ

Published:2011/8/11 22:45:00 Author:Amy

Robert Edlinger In the July/August 2004 issue we pub­lished a flickering light for use in models that uses a microcontroller to minimize the component count. Regardless of whether you want to effectively imitate a house fire, a campfire, or light from welding, the circuit described here fills the bill ...   (View)

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BISTABLE RELAY DRIVER （3）

Published:2011/8/11 21:51:00 Author:Phyllis

By B. Chiron Switching by logic level (Figure 3) With Vcc = 5 V and Cde = 5 V the driver switches the relay to the ON position (10 ms pulse). When Cde returns to 0 V, the OFF state is switched on (20 ms pulse). Take into account that t...   (View)

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Universal Mains Filter

Published:2011/8/11 21:35:00 Author:Amy

Ton Giesberts There are plenty of mains filters avail­able, with or without sockets, with or without a switch, etc. In any case, this filter is very versatile as far as the max­imum working current is concerned. It so happens that the footprint of the coil remains the same for different currents. Depen...   (View)

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BISTABLE RELAY DRIVER （2）

Published:2011/8/11 21:29:00 Author:Phyllis

By B. Chiron What to take into account - To begin with, there’s the minimum drive signal length, which should not be confused with the relay’s energizing time. We’re looking at the time needed to make the relay change over to its new position and remain in that state. If this time is specified in the datasheets, it is usually called ’min. signal width’ or ’pulse length’. Lacking thi...   (View)

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BISTABLE RELAY DRIVER （1）

Published:2011/8/11 21:17:00 Author:Phyllis

By B. Chiron Although bistable relays boast significant advantages, their use appears limited to niche applications, probably because their practical use requires just a tad more attention to design details than classic relays. Those days may be over soon with the introduction of a special driver IC from Quasinil (what...   (View)

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EAR BOGGLE-Experience an auditory illusion

Published:2011/8/11 20:10:00 Author:Phyllis

By Rev. Thomas Scarborough This month we invite all fans of the ’kitchen table’ series to build a classic auditory illusion that has had psychologists and neuroscientists puzzled for decades. Although we’re presenting a mini project built from a handful of cheap parts, it will not fail to produce stunning effects and results. This article is of the ’zero-hardware / huge background’ ...   (View)

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On-Train Radio Camera

Published:2011/8/11 2:29:00 Author:Amy

Bernd Oehlerking A radio camera on a model railway should transmit constantly while the train is moving and continue transmitting for o few minutes after the train stops. But if the train starts up again after a relatively long halt, imagery should be transmitted immediately. Consequently, the power source for the camera cannot be rechargeable batteries (since they take too long to charge),...   (View)

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NiMH Charger for up to six Cells

Published:2011/8/11 2:20:00 Author:Amy

Paul Goossens It is impossible to imagine present day society without any batteries. Count the number of gadgets in your house that are powered from batteries, you v/ill be stunned by the number of batteries you will find. The majority of these devices use penlight batteries and if you’re a little e...   (View)

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On/Off Button

Published:2011/8/11 1:56:00 Author:Amy

Ger Langezaal It features at least once in every Small Cir­cuits collection: the 555 timer. In this sim­ple circuit we give the chip a little more attention than usual (refer to ’The Eternal 555’ in the July/August 2004 issue). It is astonishing what can be built with a 555. Here at Eleklor Electronics we are...   (View)

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Unusual LED Blinker

Published:2011/8/11 1:46:00 Author:Amy

Robert Edlinger This LED blinker manages with only a few components and is dimensioned to oper­ate from an ac supply in the range of 4-16 V (6—24 V dc). As its current consumption is less than 1 mA, it’s also suit­able for long-term battery-powered oper­ation. It thus offers several advantages in various applications, compared with using the well-known 555 timer IC as an astabl...   (View)

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I²C and SMBus

Published:2011/8/11 1:36:00 Author:Amy

Paul Goossens The l2C-bus has been dealt with before in Elektor Electronics. Most readers will know that this bus requires only two sig­nals to communicate between, for exam­ple, a controller and one or more ICs in a circuit. We may also assume that it is well known that this bus was developed by Philips an...   (View)

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ROOM THERMOMETER （2）

Published:2011/8/11 1:33:00 Author:Phyllis

By Gregor Kleine The sensor will be used at room temperatures so it is not necessary to display the complete temperature range. Table 1 shows that we only need to look at the least significant five bits at the output of the ADC if the displayed temperature range is limited from +5 G (0101 0000) t...   (View)

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ROOM THERMOMETER （1）

Published:2011/8/11 1:14:00 Author:Phyllis

By Gregor Kleine Just add an A/D converter and a few discrete LEDs to this temperature sensor chip and you get a simple thermometer. This application builds an accurate and stable thermometer displaying room temperature with a resolution of 1 °C. The MAX6610 from MAXIM is a relative newcomer to the field ...   (View)

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