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Messages - jpatrick62

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Character LCDs / Re: NHD-C0220Biz and Arduino/Teensy3.1
« on: May 12, 2015, 09:14:46 PM »
OK, I tried our 2nd  NHD-C0220Biz unit and it worked fine. So the issue with the first unit was that it was defective, it would not enumerate on the I2C bus at all.  :-\
Used a 9K pull up on the working unit, that seems fine.

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Character LCDs / Re: NHD-C0220Biz and Arduino/Teensy3.1
« on: May 07, 2015, 10:17:38 PM »
One more thing - a bit odd I should think...I can get the I2C bus to enumerate only when 3.3 volt supply is removed.  :(

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Character LCDs / Re: NHD-C0220Biz and Arduino/Teensy3.1
« on: May 06, 2015, 09:43:06 PM »
I have swapped the pullups to 10K and then 2K, still no luck - I2C does not enumerate. I used another LCD I2C Backpack and it did work on I2C as well as other I2C
devices so I know it's not the mp itself. I just want to ensure I have the proper connections - so as I look down on the LCD display, the mechanical drawing seems to
indicate the connections from left to right are 8(c1-), 7(c1+), 6(Vout), 5(VDD), 4(VSS), 3(SDA), 2(SCL), 1(RST). However page 4 would seem to indicate the opposite.

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Character LCDs / Re: NHD-C0220Biz and Arduino/Teensy3.1
« on: April 27, 2015, 03:47:16 PM »
Actually we presently have 21K ohm pull-ups, but I'll try to swap them out.

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Character LCDs / Re: NHD-C0220Biz and Arduino/Teensy3.1
« on: April 27, 2015, 03:41:40 PM »
As for your other question, is the display the only device present on the i2c bus when it is locking up? 
Yes, it is the only I2C device on the bus

Have you tried using 10kOhm pull-ups?
No, but I'll do that - presently we have 47K ohm pull-ups  believe...

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Character LCDs / NHD-C0220Biz and Arduino/Teensy3.1
« on: April 24, 2015, 11:24:07 AM »
Hello, the I2C connection between the C0220Biz and my Teensy3.1 locks up when it is first initialized. Other I2c devices work fine, so I'll assume i am doing something wrong at initialization. Is there a library that will work for a teensy3.1 and a C0220Biz? It looks as if the address is 0x78. I have all the hardware connections as peer the Pin description and wiring diagram, and my supply volage to vdd is 3.3 regulated.  :-\

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