DL4YHF's Frequency Counter

Here is a picture of DL4YHF Frequency Counter that I had been building last week. The picture is taken in the middle of building so some of the components might be missing. The unit powers up fine but I have a little problem with the LED display. When displaying '0' the segment 'F' does not light up. The whole display (including the segment F) lights up when the unit does a 'Lamp Test' at init. I have looked over the display wiring several times but had no luck. I even changed couple of displays but get the same result. Due to lack of time, I haven't been able to do further testing.

Wolf, the author has been very helpful on debugging the segment issue. He even rolled out an updated code to support common anode displays on my request.

ATTiny11 Experiments

These Days I have been experimenting with ATTiny11 on a breadboard instead of STK. This setup has proven a very good small scale development board. The tiny11 anyway is programmed using a separate programmer. On the left of the motherbaord is a 5v 100ma regulated power supply with a power LED. A 32 KHz xtal is connected on pin 2 and 3 of the microcontroller. The oscillator startup time mentioned in the dataseet for a LF xtal is 4.5s but I haven't seen oscillator startup delays of more than a second.