In addition to my previous post about the ADXL335 accelerometer, I’ve now added some basic calibration! The datasheet for the ADXL335 (http://goo.gl/LAslK) does actually state the voltages that the accelerometer should produce with respect to the actual level of acceleration though as some may know, the value of gravity varies dependent on where about you […]
Its been a fair bit of time since I last posted, mostly attributed to the fact that I’m no longer living down south and have moved home for the next two weeks until I return to university! None the less, after re-arranging my room at home to my liking (my family have the obsession of […]
A few months back, I bought myself a cheap SR04 ultrasonic rangefinder (Datasheet: http://goo.gl/LBZeDG), as per off the magical eBay (Example – Link will expire: http://goo.gl/h9j79O). As you can imagine, these things are ridiculously cheap at a mere 99p inc. p+p. How that is even profitable, I’ll never know! They’re actually pretty nice devices and allow for […]
Well in light of my recent hardware addition, I’ve decided to convert the basis of my HD44780 code into a standalone library. I’ve also added the ability to print signed integer numbers with padding with my whole code including examples compiling to < 3.5k at O0 optimization! Snazzy or what, with O3 optimization, I’ve managed […]
And voila! As I said in one of the last two posts (Initial post: https://hsel.co.uk/2014/08/14/stm32f0-discovery-board-and-the-hd44780-lcd/ and integrating a charge pump for backlight control: https://hsel.co.uk/2014/08/14/stm32f0-discovery-board-with-hd44780-and-integrated-charge-pump/), I’ve now included a generic LED backlight PWM controller using one of the standard GPIO pins. I’m using GPIOA Pin 6 to drive the LED backlight and I’ve integrated a 4bit (16 step) backlight […]
The HD44780 requires a large voltage difference between Vcc and Vo to get a good contrast on the screen. When running at 5v, this difference can be pretty pretty easily achieved by merely putting a resistor between Vo and ground, dropping a certain voltage across it. However, when running at 3v, this voltage difference isn’t […]
As with nearly all of my posts, this one too starts with a really cheap eBay buy (£1.25, example: http://goo.gl/oLn3pG – Link will expire!). The HD44780 LCD (Datasheet: http://goo.gl/zQDnLh) is a pretty versatile component supporting 16 characters and 2 rows, implementing some cool functions like display shift and text scrolling. It uses an 8bit or […]
So! I decided that I wanted to properly test my servo tester (testing a tester… wuhhh?) so I bought myself some really cheap servo’s on eBay. When I say really cheap, I mean REALLY cheap! I spent a whopping £3.99 on a pair and that was with postage included (eBay Item: http://goo.gl/fACHpo as per usual, link […]
Sunday, everybody’s least favourite weekend day at the thought of having another 5 days until time is no longer scarce! I’ve been getting down to a fair bit of VHDL programming, one program I wrote recently was an attempt at a brushless DC motor. I managed to get the outputs 120deg out of phase but […]
As with nearly all cool electronic devices that I buy, this one too came from the foreign lands and was off eBay (http://goo.gl/jbcKE6 – Link will expire as with all eBay links)! One of the features that I’ve wanted to have in my watch that I’d actually find really useful is the ability to have […]
Harris' Electronics 