Welcome to the website of HomeChip, which aims to be the best and cheapest supplier of 1-wire® and other sensing and control products in Europe.


Some time on the 24th of November our site was compromised and some javascript skimming code was installed. This is a known exploit in the Magento ecommerce code that we run but was only detected and flagged by Magento on the 17th November. We detected and removed this code almost immediately. We are confident that no credit card or customer details were leaked and the site is now clean. However, Google is still marking the site as potentially hacked. We have submitted a request for review to Google and expect the marking to be removed shortly. In the meantime the site is safe to use.

Price changes

As announced previously we have had to make price increases to many Dallas/Maxim products (mostly iButtons®). These are all now in place. However we have made reductions in as many other prices as we can. In particular many Embedded Data Systems and iButtonlink products have reduced in price.

Contacting us

You can email us at info@homechip.com or phone us at +44 (0) 1908 410175  . For full company details including our address follow the "About Us" link at the bottom of the page.

VAT numbers

You will notice that you can now enter your VAT number into the billing address screen. We check this online using the Europa Vies site for an immediate confirmation that it is correct. If you are an EC customer, not located in the UK and with a validated VAT number this will automatically mean your invoice will be calculated without VAT. If you are a UK customer it will not make a difference to your VAT but it will mean that you are recorded as a business customer. 

We've had the odd case of a customer not being able to validate their VAT number. There are a couple of things that might be causing this:

  • You may be putting your country code at the start of the number, for example FR12345678. Don't do this as we already know your country from your address. Just put the VAT number itself, in this case "12345678"
  • Your country may have slightly different variants of VAT number for internal and external use. We know this to be the case for at least two EU countries. Make sure you give us the external one.
  • The VAT verification server for your country may be down. There isn't much you can do about this other than try later

If none of these applies, just give us a call and we will verify your number manually.

What is 1-wire?

1-wire is a technology defined by Dallas/Maxim and used in their range of iButtons and other 1-wire sensors which can measure and control a wide range of environmental parameters. Communication with the devices is via a two wire bus consisting of data and ground. Each device has a unique, factory programmed address which cannot be altered and which is guaranteed unique. This fact alone makes them useful for key access and identification systems, but they have many other useful functions ranging from non-volatile storage, to temperature and humidity sensing, switching and voltage measurement.

What is an iButton?

An iButton is a 1-wire component sealed into a small stainless steel can, approximately the size of a camera battery. This packaging makes them very rugged, and under normal conditions almost indestructible. Some have an inbuilt power source, such as the Thermochron range which can be set to independently measure temperature which they store internally and report when read periodically. Thermochrons can work from -40°C to +125°C and so are perfect for measuring and monitoring processes. Their uses are really only limited by your imagination.

As well as iButton and 1-wire components we supply a wide range of 1-wire sensors and controllers supplied by iButtonLink, as well as a range of readers, software and hardware accessories. Browse our catalogue for information and ideas.

Please note that all prices in the catalogue are quoted excluding VAT.

VAT at the UK rate of 20% will be added at the confirmation stage of your checkout. If you are VAT registered and outside the UK, but within the EU, please quote your VAT number when you register and we will bill you without VAT. Customers outside the EU will also not be charged VAT.