I was having problems with the “led ring” boards. Their internal oscillators were not ticking with the same speed and required constant re-syncing. I tried to improve the situation by recalibrating by adjusting the OSCCAL registers. Recalibration can be done quite easily with an oscilloscope. Either assuming that the _delay_ms() routine is reasonably correct for [...]
Maybe you remember my last post about the Jyetech oscilloscope and it’s weird behaviour. Not all of them are strange, as the free replacement DIY KIT I received from them works fine. At that time I suspected a sick ATmega64 cpu and had all sorts of plans to detect what components might be bad.
Long story [...]
The symptoms since a firmware upgrade (and downgrades, re-upgrades…):
strange characters on the display for SEC/DIV
system freezes
+/- buttons are ignored (but still work physically)
the ADC chip doesn’t get a CLK signal during a freeze
My theory:
The ATmega64-16AU is overclocked to 20MHz, which is a good reason for failure. But all the other KITs seem to work, so [...]
I bought the DIY KIT at seeedstudio recently, as I needed to feed my soldering obsession. Here are some images of the KIT coming right out of the box:
I had to use my milling machine, because the front panel cutout for the LCD was too small. Oh and DON’T [...]
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