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 [...]
robert Arduino., Electronics. AVR, calibration, DSO, frequency, hardware, oscillator
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 [...]
robert DIY., Electronics., Fix me. AVR, ChipQuik, desoldering, DSO, jyetech, rework, seeedstudio, SMD, soldering
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 [...]
robert DIY., Electronics., Fix me. AVR, DSO, jyetech, seeedstudio, soldering
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 [...]
robert DIY., Electronics., Fix me. AVR, DSO, jyetech, seeedstudio, soldering
Recent Comments