To use PCF8591 based yl-40 AD/DA shield with Arduino, the I2C bus address of the shield by default is 0x48. If DAC controller needs to be used, the control byte is 0x40.
Month: January 2016
Using 16×2 LCD display with i2c controller in Arduino
If you are planning to use a 16×2 LCD display with i2c controller in Arduino, check out this page for the three general types of LCD i2c controller, and the settings for each one of them:
Also, some controllers will have brightness controllers which can be adjusted using a small screwdriver. If the LCD blinks as per the code in the above site, but you cannot see the characters, it most probably is a brightness issue.
i2c scanner for Arduino
If you get one of those no name i2c controllers for Arduino which do not have a default address specified, take a look at either of these two scripts:
a) https://github.com/todbot/arduino-i2c-scanner/ [Disclaimer: I have made one commit to this project]