Beke Andras has an old monitor which needed some repair. So he decided to build a video generator for it. This monitor uses different signal than composite so he started investigating the problem. He took a dsPIC30F301 based board and started prototyping. Later this grew into PCB designed with Geda software.
Despite its different control, monitor still needed same horizontal, vertical and video signal. With a bit of code he was able to generate static images and moving characters (running horse). He used small special programs to draw static images and generate motion picture. Beke faced a small problem with horizontal size, and he hopes that someone with tube knowledge could help to solve this issue.
Programmable timers are used in many areas. You can set timer to turn on/off light after some time, turn off oven, control water sprinkler and do other time dependent switching. You can buy such timer for cheap – some of them even plugs in directly to AC outlet. But if you like to have things in control and be able to add additional features, then you can build a simple timer with small microcontroller. Hristo has built a programmable timer on PIC16F628A microcontroller. He intended this timer to be used in hos UV light exposure box. But by adding a relay, it can be used for anything.
Timer can be set and run with three switches where couple of them are for setting minutes and seconds. LCD indicates timer running state and is used to navigate menu while setting time. Timer also has a calibration jumper where timer can be adjusted to run more accurate. Once timer runs out timer turns switch off and then sounds buzzer alarm. Really simple and useful circuit.
Most of Nixie clock designs end up with at least four indicators that display time at once. More Nixie indicators require more space and power. But pinomelan decided that single digit IN-12 Nixie indicator is more than enough for building small portable digital clock.
He put small PCB with PIC16F84A which drives single Nixie with discrete transistor. Nixie tube needs high voltage to light up, so he used HV supply from disposable camera. Clock displays time by periodically flashing all digits in series. During display each digit can be set up by pressing button at the right moment. Nixie clock along with battery could fit in to 35mm cube enclosure if needed.
You have probably already build several LED light effects. These are simple to build as only microcontroller, resistor and LED is needed. But probably you will agree that flashing powerful lamps is more exciting and so dangerous as well. Rajkumar Sharma posted his 8 channel running lights controller that can handle 100W light bulbs on each channel.
Controller is based on PIC16F628 microcontroller which drives 8 opto-isolated triacs where each can handle 230V and 100W. Running lights effects can be changed with three tactile switches. If you planning on organizing party this might be a great next project.