TinyCircuits

short circuit on I2C during upload?

short circuit on I2C during upload?
« on: December 11, 2013, 05:56:03 PM »
Hello.

I'm working with 7 segments display panel from sparkfun and kill 2 display with tinylily!
Not the display itself but the atmega placed on the display's back...
It seems it arrive when uploading sketch in the tinylily.
Is it possible?
the display power are not connected with the tinylily power pin...
i use I2C connection on pin A4 and A5
I'm in trouble...
is possible or am i unlucky?

Any similar pb?

regards

éric

ps: some picture of the toy

Re: short circuit on I2C during upload?
« Reply #1 on: December 15, 2013, 03:41:35 PM »
Hi eric,

Not sure why this would be happening, if only the I2C is attached I'm not sure how this could be happening.  Can you post a schematic / wiring diagram of how you have this connected?

Thanks,

Ken Burns
TinyCircuits

Re: short circuit on I2C during upload?
« Reply #2 on: December 16, 2013, 05:28:23 AM »
Quote
i use I2C connection on pin A4 and A5
I thought A4 and A5 were for analog signals not digital. Shouldn't you use IO1 and IO2 for I2C?

Re: short circuit on I2C during upload?
« Reply #3 on: December 23, 2013, 06:23:53 AM »
sorry i haven't got schematics...
Only use 4 wires
2 for I2C and 2 for power and gnd on the tinylily
had other 2 wires for display module for power and grnd... from the battery holder.




strange...

i do not understand... there is no reason to have this behavour ! perhaps, i have to protect from the battery and switch? but how?