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June 20, 2011
about 3 years ago
It would be very helpful if you would note in the Features (or Replaces) section above
that the Brightness settings are not compatible with the replaced part (now 00 to FF, were FF to 00).
about 3 years ago
The replacement part is not fully program compatible.
Here, the Brightness is FF to 00, but in the replacement
part, the Brightness is 00 to FF (dim to bright).
Thanks for the Brightness “flip” verification.
However, it is a real pain to support two versions
of this part, especially since there is no way to
tell the difference when using just the Serial RX control.
How about making a firmware version for this part that has
compatibility with the part that this device is replacing?
At least it would be easy for you to make the required firmware
Hex file and make it available to us, or at least to me.
I will look for a description of how to flash new firmware
into this device, but maybe you can point me to the right info.
I am using 5v for power at VCC.
Strange, my programmed brightness for the old part is:
//uart_putchar(0x7E); // about half is too dim
//uart_putchar(0x1E); // almost max daytime, still too dim
//uart_putchar(0x00); // max for daytime
// turn the brightness full ON
uart_putchar(0x7A); uart_putchar(0x00); // full bright
But, you say that 0xFF is full bright, not 0x00.
Has this changed?
Thanks Again, Gary
Using different power source, to eliminate that as a problem…
The LED segments in this new part have MUCH, MUCH LESS brightmess
(same driving code) than what I was getting with the previous part.
I tested the new part and then the old part in the same test jig.
Has anything changed in the brightness control commands, or in how
the brightness is controlled from very dim to full bright?
In the old part, the segments are nicely a constant bright.
With the new part, they are dim, and flicker a bit.
Unless there is a way to get up to the previous level of brightness,
this new part is essentially unusable in my application.
Any thoughts, please?
All segs off at Power ON means that there is no way
to tell if the part is working before putting it into
a working circuit.
I put it in the circuit, set the baud rate, and then I
can see the expected characters. Thanks, that is good.
However, the brightness seems to be low, but I will check
using a better power source than the test jig currently has.
In incoming QC, I apply 5v to VCC and Ground to GND, but nothing lights up.
The replaced unit would show “0000” after power-on bootup.
What is different with this new design, please?
I tried two parts, and all 3 of the Gnd/Vcc connections.
Perhaps you can make the datasheet available as a single pdf?
It seems that GitHub complains when I access the datasheet with IE7.
News - March Caption Contest
about 4 years ago
I help clean the last toy from a bin, and they yell at me about being “Out of Stockings”, or something like that … sigh!
If I don’t help fulfill orders, they cut my food … :(
No public wish lists :(
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