Hi guys, im trying to display text in my lcd with the i2c module but somehow when i increase the contrast all i can see is white boxes only in the first line.
i've used the hd44780 diagnostic example to debug this problem and this is my output:
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Serial Initialized
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I2CexpDiag - i2c LCD i/o expander backpack diagnostic tool
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hd44780 lib version: 1.3.2
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Reported Arduino Revision: 1.6.7
CPU ARCH: AVR - F_CPU: 16000000
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SDA digital pin: 18 A4
SCL digital pin: 19 A5
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Checking for required external I2C pull-up on SDA - YES
Checking for required external I2C pull-up on SCL - YES
Checking for I2C pins shorted together - Not Shorted
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Scanning i2c bus for devices..
i2c device found at address 0x27
Total I2C devices found: 1
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Scanning i2c bus for all lcd displays (4 max)
LCD at address: 0x27 | config: P01245673H | R/W control: Yes
Total LCD devices found: 1
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LCD Display Memory Test
Display: 0
LCD stuck BUSY status
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No working LCD devices
As you can see, the LCD shows an BUSY
status, i've searched for solutions in arduino's forum, but i still cant manage to solve this.
Im sending the soldering and the connections: