I was extremely satisfied (and proud) of the way that the enclosure turned out for the rework of my 7490 Clock. The electronics on the other hand, is another story.
The innards of that clock were from a prototype I built in 2001. It was a proof of concept. It led to the design of what would become an extremely well-polished and accurate clock.
Since it was one of the first things I ever built, I decided to put it in an enclosure of its own and consider it too as a finished product.
The problem was that the prototype never ran properly. It worked, just not as well as it should. Needless to say, I tried to fix it in the way of an Arduino upgrade. On paper everything should run perfectly, but in the real world, it just doesn’t. The clock bounces all over the place. It’s more of a random number generator than a clock. I really thought that moving away from the 60Hz line signal as a timebase to a solid 1Hz signal from a DS3231 RTC would solve all my problems. At the end of the day, it boils down to the fact that it’s all soldered together on a DIY homebrew PCB. The holes that I drilled are too big for the pins; resulting in some pretty shoddy-looking soldering. It’s a noisy circuit, and I’m sure there’s some grounding issues in there too.
Large 7-Segment Clock – [Link]
Designing a CC LED driver – Following on from Part 1, I design some code for a Microchip dsPIC33FJ16GS502 microcontroller to user the high speed PWM module to drive a high power LED at a constant current.
Constant Current DC-DC LED Driver Design – [Link]
by Tustin High T-Tech @ instructables.com:
The purpose of this small scale LED marquee is to display messages to our classroom in a more modern and centralized way. In the classroom, this construction would save white board space and is convenient because it can store a large amount of information. It is also fairly simple to program and has a mount, making it easy to place anywhere within the classroom setting.
64×16 RED LED Marquee – [Link]
In this article Raj over embedded-lab.com shows us how to measure our heart rate using Arduino UNO, his Easy Pulse Plugin and 4-digit SPI seven segment LED display module. It computes the heart rate by processing the analog pulse signal output from the Easy Pulse Plugin sensor and displays it on the seven segment display module.
Arduino measures heart beat rate from fingertip – [Link]
This design is a type of indicator that is used in voltage reading. It operates as an indicator rather than a meter that drives LED for voltage indication. Voltage thresholds are 1.5, 3, 4.5 and 6V. Above each incremental threshold an additional LED turns on.
LED DC Voltage Indicator – [Link]
by Ole_L @ instructables.com:
If you wanna build a fancy led matrix display with only a few pixels, this is exactly what YOU need!
-WS2812(B) LED strip
-A piece wood
-7 jumper wires
-7 female pin headers
10×5 RGB LED Matrix with only 5 IO pins – [Link]
by Scarab Hardware :
Ambient lighting is a technique that creates light effects around the television that correspond to the video content. It has been pioneered by Philips under the brand Ambilight. In this project we will create a basic FPGA-based ambient lighting system that reads the video signal over HDMI. This means we are not limited to computer output. We can use it together with DVD players, video game consoles, etc.
DIY FPGA-based HDMI ambient lighting – [Link]
0-10V Volt monitor project has been designed around LM3914 IC, It is an easy and less expensive project which instantly visualizes voltage level. The project is based on the popular LM3194 IC from Texas instruments. Handy 0-10V DC Voltmeter can be used as a voltage tester.
The LM3914 senses the voltage level at the input pin and drives the 10 light emitting diodes based on the voltage detected on input connector. Circuit works on 12V DC. J1 Jumper is used to select the DOT mode or bar graph mode.
0-10V Voltage Monitor – [Link]
This is a variable range LED bar graph voltmeter project. It is a simple and less expensive project that displays voltage of a given source with the help of 10 LEDs. The project is based on the famous LM3914 IC from Texas instruments.
Variable Range LED Voltmeter – [Link]
Thin LED strip but also a powerful LED application sourced directly from 230V mains line are no problem for Wago series 2059, 2060 and 2061 terminal blocks.
Innovative series Wago 2060 now has two new familiar – smaller and bigger one. We talk about series 2059 and 2061. In result, WAGO 2059, 2060 a 2061 LED terminal blocks series create a comprehensive family of SMT connectors usable for practically any LED applications and in general – for every application, where advantages are low profile of connectors, reliable contact resistant to vibrations (spring clamp) and also aesthetical look…
Already the 2060 series showed us all main benefits of SMT LED connectors Wago 20xx. It has found its place on a market very quickly and it´s perspective for all new designs. Moreover, now we can choose from already three types:
- 2059 – extra miniature connector, only 2.7 mm high. 160V/3A, for wires 0.14-0.34 mm2, 3mm pitch.
- 2060 – universal miniature connector, only 4.5 mm high. 160V/9A, for wires 0.2-0.75 mm2, 4mm pitch. Also available with 8mm pitch version with max. operating voltage up to 630V. Also available a THR version with wave-solderable pins.
- 2061 – the biggest (but still miniature) connector, only 5.6mm high. 320V/ 17.5A, for wires 0.5-1.,5mm2, 6 mm pitch. Ideal for direct connection of power supply to products (power input and output for LED drivers, powerful LED applications, …). A black version is also available.
All types are produced in 1-3 pole versions and also available are connecting links to interconnect two PCBs with each other (easy creation of long strings). Similarly, all types are suitable for automated pick-and-place assembly. Connector body is made of a made of an advanced material (glass fiber reinforced PPA) with a very wide range of operating temperatures.
Detailed information will provide you the Wago 2059-2060-2061 brochure.
Wago LED terminal blocks are ready for small and also big applications – [Link]