On 2/24/15 6:38 PM, Joe Croft wrote:
Hi Yall,
Okay, I scoped the board and I have almost 500us of total dead time
between digits. This was measured on the digital outputs from the CPU.
My code is written in a way that I turn off all of the segment and digit
signals one at a time in a for loop so they are not all triggering at
once. They are turned on in a like manner. I do not know the time
between these, but the app know's nothing about the actual port and bit
that is being turned on or off so I assume the time is in the 1us ball
park if not more. I am using a 16MHZ ATMega328.
Do you turn off all the cathodes, then wait a hundred microseconds, then
turn off the anode, then turn on the next anode, then turn on the next
cathode?
Because if you don't have that delay between the cathode and the anode
turnoff, then you get ghosting.
--
David Forbes, Tucson AZ
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