I'm building a project in which I must interface the following boards:
1 x Standard LCD 20x4 + extras (white on blue) plus 1 x i2c / SPI character LCD backpack with an ATmega2560-Embed Arduino.
LCD2004 – HD44780 PRODUCT ID: 198
I2C Display PCF8574 PRODUCT ID: 292
The problem that I'm encountering concerns the display which shows nothing.
I tried to run my project as well as the sketch of the demo project (https://learn.adafruit.com/i2c-spi-lcd- ... no-i2c-use) but nothing to do.
I checked with an oscilloscope the signals and everything seems to be ok in the sense that the clock and data signals go well up to the connector of the i2c / spi converter.
In attached some photos of the project.
Thank you for your help and tips.
Display and Atmega256 Arduino
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BrunoInrim
- Posts: 1
- Joined: Tue Jun 22, 2021 7:43 am
Display and Atmega256 Arduino
- Attachments
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Boards and schematic.pdf- Board connection and schematic
- (411.91 KiB) Downloaded 1 time
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- i2c/spi adapter and LCD connection
- IMG_20210622_091629.jpg (450.07 KiB) Viewed 61 times
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- LCD display
- IMG_20210622_091609.jpg (305.72 KiB) Viewed 61 times
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adafruit_support_carter
- Posts: 29483
- Joined: Tue Nov 29, 2016 2:45 pm
Re: Display and Atmega256 Arduino
Is that the only board you have available to control the display? Do you have something like an Arduino UNO that could be used for testing?
Please be positive and constructive with your questions and comments.