Adrian Smith – Page 4 – Adrian’s electronics blog

2 min 1

Building an LCD alarm clock & DS1307 RTC accuracy

Adrian Smith
13/01/2018

I’ve been working on a new Arduino project; the ultimate alarm clock which shows the time and date on a 16×2 LCD module and features multiple alarms with repeat / auto arm and radio function. I used a Tiny DS1307 RTC and EEPROM module which is a breadboard / veroboard compatible PCB containing a DS1307 […]

1 min 1

Rants

Atari Portfolio retro computers

Adrian Smith
28/12/2017

Around 12 years ago I had four Atari Portfolio palmtop computers complete with boxes, manuals and a ton of memory cards plus many accessories. For some really stupid reason I decided that they were a pieces of crap and chucked them (I faintly remember trying to sell them on ebay without success) but not before […]

1 min 3

Projects

NIMH battery tester – firmware version 2. Now with improved voltage reading accuracy.

Adrian Smith
17/12/2017

In my last post I built a multiple AA battery tester but it used the 5V as a voltage reference which wasn’t ideal and was giving readings that were good but could be better. I modified the code to use the 1.1V internal reference of the Mega328 MCU to calculate the actual 5V supply voltage […]

2 min 0

Arduino NIMH battery tester update

Adrian Smith
12/12/2017

Back in October I posted about a basic NIMH battery tester based on an Arduino nano I made some time back which was a successful project and works quite well however it could only test one battery at a time and didn’t apply a constant current load. It was good but not very accurate and […]

2 min 2

Arduino scrolling clock and custom message on 5×7 matrix

Adrian Smith
06/12/2017

Introduction I’ve been playing around with a red 5×7 dot matrix LED display module which I have had in my spares box for a while. I thought about making some sort of scrolling message display as an Arduino project but could not find any more of these modules online as I’d need at least another […]

1 min 0

General

Fake DS18B20 sensors from China sold on Ebay / Amazon?

Adrian Smith
04/12/2017

A while ago I read an article on fake electronic components that are flooding the market with high end audio and hobbyist parts being the biggest targets of the fakers. The article in particular spoke about high end transistors used in power amplifiers blowing or producing nowhere near the gain and / or frequency response […]

M	T	W	T	F	S	S
						1
2	3	4	5	6	7	8
9	10	11	12	13	14	15
16	17	18	19	20	21	22
23	24	25	26	27	28