Numitron display based digital clock

I bet you like Nixie clocks and probably wouldn’t mind to have one on your table. Anyway, Nixie displays require relatively high voltage to light segments. But if you don’t want to generate higher voltages but rather stay with 5V then you should consider numitron displays. These vacuum tube displays light up from like 5V. Pinomelean purchased several of IV-9 displays and wanted to build very simple digital clock.

Instead of making full number display he used single digit to tell time. The method is pretty simple – it displays hours and minutes one by one. Four additional LEDs allow easy tracking of current digit displayed. Clock is driven by PIC16F84A microcontroller which is clocked at 4MHz. Using one digit display saves space and allows to design small device. For basic time monitoring this is more than enough.  

Digital clock as we know it

Sometimes we just need a simple digital clock without fancy features and schematic. So manelsoft simply found textbook PIC based digital clock and built it.

Clock uses PIC16F84A microcontroller driven by 4MHz crystal clock source. Time is displayed on 6 seven segment LED display controlled through CD4017 decade counter and common cathode transistors. Clock can be set with two available push-buttons. Source code and other necessary files are available to download and have it running right away.

PlayPIC: A PIC16F84A based trainer to play with

When we were still kids (not so long ago for me) we were trained to walk using wheeled walking aids, when we started preschool we have those plastic template for us to trace drawings. Well in the world of electronics and microcontrollers the case is similar – they don’t give you something an electronic aid or something instead they have things called trainers – these stuff is where you could practice both your electronics and programming skills keeping you tuned for the challenging project that awaits!

This simple project aims just to give you the practice that you need. Based on the popular PIC16F84A microcontroller it’s jam-packed with the input and output options to hone your microcontroller programming. It has eight single Leds, a seven segment display, five push buttons and something that every project should have – LCD! It takes the beginner to a step further into the world of microcontrollers. One of the most important features of PlayPIC is that it has an in-circuit-programming header which means you could reprogram the microcontroller without unplugging it out of the socket.

They say never mix playing with studying – its time to add an exception with PlayPIC.

PicOClock an expensive way to tell time using a PIC16F84A

I know most of you guys have already seen/used/dismantled/damaged an oscilloscope, well for me the oscilloscope is the rectangular box with a small TV screen with green curves that we use in the laboratory, to have a clear description of the oscilloscope I checked wiki – and it says:

“An oscilloscope is a type of electronic test instrument that allows observation of constantly varying signal voltages, usually as a two-dimensional graph of one or more electrical potential differences using the vertical or ‘Y’ axis, plotted as a function of time.”

Bruno Gavand got this neat idea of using his high tech scope to display time by using a PIC16F84A microcontroller. Using four resistors configured to operate like a 2bit R-2R DAC Bruno could control the Y-axis of the scope’s plot while using pulse width modulation on the trigger line to control the timing. By using both timing and Y axis controls together Bruno was able to display numeric values in a scope. It also comes with two push buttons, one for hours and one for minutes. Talk about expensive way of keeping time.