John,
Thanks for your detailed reply. I hadn't had a chance to touch the Nixies
for two months, so it's sat idle until today. I messed around with the code
and it turns out that the addressing was the problem (I never doubted that
the smart nixie modules were working correctly :-) ). What I found is that
the Arduino I2C insists on using 7 bit addressing with a left shift, so I
had to *right shift* my effective address. The code that works (I've tested
it with an individual address instead of iterating and fun the individual
test for the first five addresses in the space to confirm that something
else isn't happening).
Here is my working code that simply counts 0-9 and loops:
#include <Wire.h>
void setup()
{
Wire.begin(); // join i2c bus (address optional for master)
Serial.begin(9600);
for(byte j = 0; j < 6; j++)
{
Wire.beginTransmission(0x08 + j); // transmit to tube address
Wire.write(0x0B);
Wire.write(50);
Wire.endTransmission(); // stop transmitting
}
}
void loop()
{
for(byte i = 0; i < 10; i++)
{
for(byte j = 0; j < 6; j++)
{
Wire.beginTransmission(0x08 + j); // transmit to tube address
Wire.write(0);
Wire.write(i);
Wire.endTransmission(); // stop transmitting
}
Serial.println(i);
delay(50);
}
}
Thanks again for your help and responsiveness.
On Tuesday, August 25, 2015 at 3:16:59 PM UTC-7, taylorjpt wrote:
>
> The flash is the charge coupled from the fast rising transistor drains
> coupled into the gates that turns on all segments just before the processor
> boots and sets all segments to off. This is the result of avoiding putting
> pull down resistors on every gate for space considerations.
>
> The first thing to check is whether you are getting an ACK from the first
> address write to the device, 0x10 for write and 0x11 for read: Note that
> 0x10/0x11 is the full 8 bit address of the device with the Read/nWrite bit
> included and
> not a 7 bit address that needs to be shifted left to be 0x20 and 0x21 for
> write and read respectively. This can be clearly seen in figures 16a and
> 16b of the datasheet (
> http://www.tayloredge.com/storefront/SmartNixie/DataSheets/Datasheet_SmartNixie.pdf).
>
> If you are getting the ACK then the addressing is correct and then you can
> move on to register access problems.
>
> jt
>
> On Tuesday, August 25, 2015 at 10:47:57 AM UTC-7, TheJBW wrote:
>>
>> John,
>>
>> Thanks for the advice. I definitely had the polarity of the switches
>> wrong in my head. Unfortunately, I am still getting no joy out of the
>> tubes. After a long power off, they will flash briefly when brought up, so
>> I am fairly confident that the micro is alive. Voltages look good, and I am
>> seeing clean pulses on the i2c lines... I tried poking the brightness
>> register as in the datasheet, just in case, as well.
>>
>
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