Tag Archive | "light"

Old Kit Review – Talking Electronics Fluorescent Simulator


Slowly we’re working through the stock of old kits, and in this article we have the “Fluorescent Lamp” simulator from Talking Electronics. To save repeating myself you can read more about Talking Electronics here and watch interviews of the founder Colin Mitchell here.

So why would you want to simulate a fluoro’ tube anyway? Model railways! When your model world moves from day to night, it’s neat to have street lights and so on “flicker” on just like the real thing. And thus you can create this effect as well. It can drive incandescent lamps up to 12V, and allowing it to be powered easily from most layouts.

The kit was originally described in the Talking Electronics book “Electronics for Model Railways” (volume 1) which was full of useful and interesting electronics to liven up any layout. The book may now out of print however at the time of writing this you can download or view most of the projects from the index column of the Talking Electronics website… or contact Talking Electronics if they have any copies of the book (or kit) to sell.


Time was not kind to the kit, to be frank it was surprising to find one at all:

Talking Electronics Fluorescent Simulator kit

(Just a note for any over-enthusiastic readers, Talking Electronics is no longer at the address on the bag shown above). However it was complete and ready for assembly. The PCB has a silk-screen with the required component placement information, polarities and so on – a first for the time:

Talking Electronics Fluorescent Simulator PCB top

Talking Electronics Fluorescent Simulator PCB bottom

The instructions and “how it works” are not included with the kit as you were meant to have the book, however TE have made them available as a separate download (.pdf) The kit included everything required to get started, and there’s an LED which replicates the effect so you can test the board without having to watch the connected bulb (which may be a distance away). Finally an IC socket is included 🙂

Talking Electronics Fluorescent Simulator parts

The actual assembly process was very straight forward, which simply required starting with the low-profile components and working up to the large ones:

Talking Electronics Fluorescent Simulator assembly 1

The only problem with the PCB was the holes – looks like only one drill size had been used (apart from the mounting holes) which made getting that rectifier diode in a little tricky. Otherwise it was smooth sailing.

Talking Electronics Fluorescent Simulator finished 2

Not having a model railway at the moment left me with the simple example of the onboard LED and a small incandescent globe to try with the circuit. You can see the kit working in this video.

John – Why do you publish these “Old Kit Reviews”?

They’re more of  a selfish article, like many electronics enthusiasts I have enjoyed kits for decades – and finding kits from days gone by is a treat. From various feedback some of you are enjoying them, so they will continue for fun and some nostalgia. If you’re not interested, just ignore the posts starting with “Old”!


For a kit from the mid-1980s, this would have solved the problem neatly for model railway enthusiasts. By using two or more of the kits with different capacitor values, many model lights could blink on with seemingly random patterns. However it’s 2014 so you could use a PIC10F200 or ATtiny45 and reduce the board space and increase the blinking potential.

Nevertheless, it was an interesting example of what’s possible with a digital logic IC. Full-sized images and a lot more information about the kit are available on flickr. And if you enjoyed this article, or want to introduce someone else to the interesting world of Arduino – check out my book (now in a third printing!) “Arduino Workshop”.

visit tronixlabs.com

Have fun and keep checking into tronixstuff.com. Why not follow things on twitterGoogle+, subscribe  for email updates or RSS using the links on the right-hand column, or join our forum – dedicated to the projects and related items on this website. Sign up – it’s free, helpful to each other –  and we can all learn something.

Posted in electronics, kit review, talking electronics, tronixstuff

Review – Freetronics Module Family


In this article we examine a new range of eleven electronic modules from Freetronics. When experimenting with electronics or working on a prototype of a design, the use of electronic components in module form can make construction easier, and also reduce the time between thoughts and actually making something 🙂 So let’s have a look at each module in more detail…

PoE Power Regulator – 28V

This is a tiny switchmode voltage regulator with two uses – the first being regulation of higher voltage up to 28V carried via an Ethernet cable to a Freetronics Ethernet shield or EtherTen to power the board itself. The PCB is designed to drop into the shield or EtherTen as such:

… and converts the incoming voltage down to 7V which can be regulated by the EtherTen’s inbuilt regulator. The second use of this board is a very handy power supply for breadboarding or other experimentation. By bridging the solder pads on the rear of the board, the output is set to 5V DC, as such:

Note the addition of the header pins, which make insertion into a breadboard very easy – so now you have a 5V 1A DC power supply. For more information visit the product page.

N-MOSFET Driver/Output Module

This module contains an On Semi NTD5867NL MOSFET which allows the switching of a high current and voltage line – 60V at up to 20A – with a simple Arduino or other MCU digital output pin. The package is small and also contains enlarged holes for direct connection of high-current capability wire:

The onboard circuitry includes a pull-down resistor to ensure the MOSFET is off by default. For more information see the product page.

Logic Level Converter Module

This is a very simple and inexpensive method to interface 3.3V sensors to 5V microcontrollers in either direction.The module contains four independent channels, as shown in the image below:

However you can interface any low or higher voltage, as long as you connect the low and high voltages to the correct sides (marked on the PCB’s silk screen). For more information please visit the product page.


Surprisingly this module contains a RGB LED module (red, green and blue LEDs) which is controlled by a WS2801 constant-current LED driver IC. This module is only uses two digital output pins, and can be daisy-chained to control many modules with the same two pins. The connections are shown clearly on the module:

The WS2801 controller IC is on the rear:

There are several ways to control the LEDs. One way is using the sketch from the product home page, which results with the following demonstration output:

Or there is a unique Arduino WS2801 library available for download from here. Using the strandtest example included with the library results with the following:

During operation the module used less than 24 mA of current and therefore can happily run from a standard Arduino-type board without any issues. For more information please visit the product page.

TEMP Temperature Sensor Module

This module allows the simple measurement of temperature using the popular DS18B20 temperature sensor. You can measure temperatures between -55° and 125°C with an accuracy of +/- 0.5°C. Furthermore as the sensor uses the 1-wire bus, you can daisy-chain more than one sensor for multiple readings in the one application. The board is simple to use, and also contains a power-on LED:

Using the demonstation Arduino sketch from the product page results in the following output via the serial monitor:

Using this module is preferable to the popular Analog Devices TMP36, as it has an analogue output which can be interfered with, and requires an analogue input pin for each sensor, whereas this module has a digital output and as mentioned previously can be daisy-chained. For more information please visit the product page.

Humidity and Temperature Sensor Module

For the weather-measuring folk here is a module with temperatures and humidity. Using the popular DHT22 sensor module the temperature range is -4°C to +125°C with an accuracy of +/- 0.5°C, and humidity with an accuracy of between two and five percent. Only one digital input pin is required, and the board is clearly labelled:

There is also a blue power-on LED towards the top-right of the sensor. Using the module is quite simple with Arduino – download and use the example sketch included in the sensor library you can download from here. For the demonstration connect the centre data pin to Arduino digital two. Here is an example of the demonstration output:

Although the update speed is not lightning-fast, this should not be an issue unless you’re measuring real-time external temperature of your jet or rocket. For more information please see the product page.

Shift Register/Expansion Module

This board uses a 74HC595 serial-in parallel-out shift register which enables you to control eight digital outputs with only three digital pins, for example:

You can daisy-chain these modules to increase the number of digital outputs in multiples of eight, all while only using the three digital output pins on your Arduino or other microcontroller. For more information about how to use shift registers with Arduino systems, read our detailed tutorial. Otherwise for more information about the module please visit the product page.

Hall Effect Magnetic and Proximity Sensor Module

This module contains a sensor which changes output from HIGH to LOW when a magnetic presence is detected, for example a magnet. The board also has an LED which indicates the presence of the magnet to aid in troubleshooting:

Using this module and a small magnet would be an easy way to create a speedometer for a bicycle, the module is mounted to the fork, and the magnet on the rim of the front wheel. For more ideas consider the speedometer project in this tutorial. Otherwise for more information about this module please visit the product page.

Microphone Sound Input Module

This module performs two functions – it can return the sound pressure level (SPL) or the amplified audio waveform from the electret microphone. The LED (labelled “DETECT”) on the board visually displays an approximation of the SPL – for example:

… however the value can be returned by using an analogue input pin on an Arduino (etc). to return a numerical value. To do this connect the SPL pin to the analogue input. The MIC pin is used to take the amplified output from the microphone, to be processed by an ADC or used in an audio project. For more information please visit the product page.

Light Sensor Module

This module uses the TEMT6000 light sensor which returns more consistent values than can be possible using a light-dependent resistor. It outputs a voltage from the OUT pin that is proportional to the light level. The module is very small:

Use is simple – just measure the value returned from the OUT pin using an analogue input pin on your Arduino (etc). For more information please visit the product page. And finally, the:

Sound and Buzzer Module

This module contains a piezoelectric element that can be used to generate sounds (in the form of musical buzzes…):

Driving the buzzer is simple, just use pulse-width modulation. Arduino users can find a good demonstration of this here. Furthermore, as piezoelectric elements can also generate a small electrical current when vibrated, they can be used as “shock” detectors by measuring the voltage across the terminals of the element. The procedure to do this is also explained clearly here.

Now for a final demonstration – we use the light sensor to demonstrate making some noise with the buzzer module:

One final note I would like to make is that the design and construction quality of each module is first rate. The PCBs are strong, and the silk-screening is useful and descriptive. If you find the need for some or all of the functions made available in this range, you could do worse by not considering a Freetronics unit. Finally, although this has only been a short introduction to the modules for now, we will make use of them in later projects.

The modules are available directly from Freetronics or through their network of resellers.

Disclaimer – Modules reviewed in this article are a promotional consideration made available by Freetronics

Have fun and keep checking into tronixstuff.com. Why not follow things on twitterGoogle+, subscribe  for email updates or RSS using the links on the right-hand column, or join our Google Group – dedicated to the projects and related items on this website. Sign up – it’s free, helpful to each other –  and we can all learn something.

Posted in arduino, freetronics, learning electronics, microcontrollers, modules, reviewComments (0)

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