Showing posts from May, 2013

Chronograph update

When I made the smaller screw on sensor that connected to the PC and fed the timing into a PC application, it got me thinking about different types of display that could be used and after a a good look around the net I came across a couple of options.

The first was a 7 segment LED display, these come in different shapes and sizes and could still be quite portable when added to the sensor.

The only problem with these displays is the amount of IO needed to drive them as each of the segments require driving. I then came across the Adafruit 7 display backpack, which takes all the hard work out of controlling the 7 segment displays.
The backpack details can be found here
The device is based on an Holtek HT16K33 chip that controls the LED segments and connects to the Arduino via the I2C bus and has a library that makes sending data to the display easy.

I bought one of the displays from Ebay and stuck it on the side of the sensor tube then added the code to the sketch to send the value for f…

Cheap Colour TFT with the Arduino

As long as I've been working with Arduinos I've always wanted to use a colour TFT to display stuff but they were always quite expensive, well now I've found a quite cheap one that's relatively easy to programme. Ebay link.

I read a blog article from about using an inexpensive TFT from Ebay (China) it costs about £7 inc. delivery, worth a try. is definitely worth a visit as there are loads of Arduino tutorials to read.

There's already a library available from another site called UTFT.rar, download it and install to your library folder.

The library comes with three fonts, small, large and a seven segment calculator type font, unfortunately the seven segment font doesn't come with a decimal point so when you use it to display floating point numbers with the printNumF command it doesn'…