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PDF to JPGs with Java 27 Aug 2013 | 08:15 pm
I have a requirement to take a PDF, covert it to JPG and then show these on a web page. This can be done using Ghost4J and Ghostscript. Ghost4J is a Java API onto the Ghostscript functionality. This ...
Reading PIXAXE URF ERF output with Python 24 Aug 2013 | 10:24 pm
Previously, we've talked about reading light level data via an LDR and a PICAXE and transmitting this wirelessly using an ERF and URF pair. (http://drumcoder.co.uk/blog/2013/aug/24/ldr-wireless-sensor...
LDR Wireless Sensor with PICAXE ERF 24 Aug 2013 | 09:59 pm
Following on from http://drumcoder.co.uk/blog/2013/aug/22/picaxe-urferf-hello-world-ubuntu/ I wanted to transmit something that was gathered from a sensor, rather than just static text. All I have ava...
PICAXE URF/ERF Hello World on Ubuntu 23 Aug 2013 | 01:57 am
I wanted to use the PICAXE URF and ERF modules to send information gathered by a PICAXE to a computer. This means that I can send temperature readings, or signals from a rain gauge, through to the com...
PICAXE 7 Segment LED Counter 18 Aug 2013 | 12:39 am
You can drive a 7 segment LED from the PICAXE by making use of the CMOS 4026 Decade Counter. See http://drumcoder.co.uk/blog/2013/aug/12/7-segment-counting/ for how to set this up for a digit or two. ...
Simple PICAXE Input 17 Aug 2013 | 03:50 pm
We've used outputs from the PICAXE (PICAXE on Ubuntu) to flash LEDs. Now it's time to read an input. Here we're going to add a potentiometer, which will vary the voltage on one of the PICAXE input pi...
PICAXE on Ubuntu 17 Aug 2013 | 01:39 am
The PICAXE is a programmable microcontroller. You'll need a special USB cable (http://spiratronics.com/product-39355.html) from your computer to program it, and the following circuit to test it. Suppl...
7 Segment Counting 13 Aug 2013 | 12:30 am
http://drumcoder.co.uk/blog/2013/aug/06/555-timer-astable/ shows how to set up a 555 timer so that it outputs pulses that have the same length. We can use a 4026 decade counter to count these pulses a...
Flip Flops and Sequential Logic 9 Aug 2013 | 08:29 pm
We have looked at logic gates so far; the output from these is wholly dependent on the input at a particular time. With sequential circuits, the output is determined by the order in which operations a...
74xx Series Logic 9 Aug 2013 | 01:54 am
Next it's time to look at logic gates. I'm using the 74LS series of chips, because I have a lot from experiments 20 years ago. The modern equivalent is probably the 74HC series as recommended in Make:...
