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Messages - Will

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OLEDs / Re: NHD-0420CW-AB3 I2C Setup Question
« on: February 28, 2016, 06:52:23 PM »
Yes 3.3v power and logic (see diagram in previous post).

OLEDs / Re: NHD-0420CW-AB3 I2C Setup Question
« on: February 27, 2016, 11:26:34 PM »
Ok I solved my own problem.  It was the reset pin...  I didn't tie it HIGH.

I have the display showing me characters!

OLEDs / NHD-0420CW-AB3 I2C Setup Question
« on: February 27, 2016, 02:13:37 PM »
I have the NHD-0420CW-AB3 wired up as shown in my diagram (see attachment) but I can not seem to get the I2C interface up.  I am using the following function to scan the I2C Bus.  All other devices on the Bus are found except for the NHD-0420CW-AB3.  Can you tell what I have wrong?  Thanks!

Code: [Select]
void ScanI2CBus()
byte error, address;
int nDevices;

nDevices = 0;
for (address = 1; address < 127; address++)
// The i2c_scanner uses the return value of
// the Write.endTransmission to see if
// a device did acknowledge to the address.
error = Wire.endTransmission();

if (error == 0)
Serial.print(".....I2C device found at address 0x");

if (address < 16)

Serial.print(address, HEX);
else if (error == 4)
Serial.print(".....Unknown error at address 0x");
if (address < 16)
Serial.println(address, HEX);

if (nDevices == 0)
Serial.println(".....No I2C devices found\n");

- Will

[attachment deleted by admin]

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