Internet of Things Hardware

Who we are and what we do

We are a small family run business in the Scottish Borders region of the UK. Our name comes from the Gallic “tir-na” meaning “land of”. We design analogue and embedded circuits for acquisition and analysis of data in industrial and residential applications. Internet of Things hardware makers need our products to include in hardware designs and prototypes.

Analogue signal filters and micro-controller I/O expansion are available, with full technical details to allow you to incorporate them into your custom designs.

Occasionally, we produce designs which may be useful to makers and electronics enthusiasts as well as companies and we are making these designs available, ready built, through our new website.  We only sell our own designs and only if we think they have a unique selling point (USP). There are currently 3 products:-

Analogue Low-Pass Filters

If you want to avoid the old “garbage in – garbage out” problem, then you should filter your signals before digitising them. Our filters are standard designs, but we believe they are the only ones on the market at a reasonable price and on quick turnaround. That’s the USP.  We have an off-the-shelf range of low-pass filters from 1 Hz to 20kHz in the usual 1Hz, 2Hz, 5Hz etc. sequence of values. You get full schematic and layout. These are open hardware designs you can incorporate into your product. Use the item page’s form to specify a custom cut-off frequency not in the standard range.

Logic Probe

The world is full of logic probe designs, usually with a TTL/CMOS switch. Our probe is fully functional with all logic supplies up to 12V and has user adjustable thresholds for good/bad 1’s & 0’s. You just need a ‘scope or voltmeter to set them up. That’s the USP. This logic probe identifies inputs by flashing both red & green LED’s.

For application to analogue circuits, you can set it up as a window discriminator as that is basically what it is. You get a schematic and a layout so you know what is going on “under the hood”.  More USPs!

ESP8266 Analogue Input, Digital I/O Expander

If you want a decent amount of analogue and digital I/O while retaining all the benefits of the ground-breaking ESP8266, you could move to the new ESP3232 and that may be the best option for you.  However, if, like us, you feel you have just mastered the ESP8266 and you want to exploit it further, then this expander board may be what you need. We program the ESP8266 as an Arduino. We like the simple life.

This expander board only “taps into” the (normal) SDA and SCL, I2C-bus lines from the ESP8266 leaving all other GPIO lines free for use in the usual way. However, it does add an 8-channel, 10-bit ADC and a 16-channel I/O expander. Arduino libraries are available for both devices on the web.

All analogue inputs and digital GPIO’s are protected against overloads, over-voltages and shorts and analogue inputs have R-C low-pass filters. That’s the USP.   This is not a bare-bones “expander” board from China. This I/O protection adds 56 additional components! Again, this is an open hardware design. You get 4 pages of schematic, a layout and a handbook. The handbook is available for download in short-form and full-form before you buy. Have a look.

Happy Shopping and Seasons Greetings,

Tirna team

We are looking to add new products and services, please use the below form if you’d like to see something: