Difference: HD44780 (5 vs. 6)

Revision 62017-11-16 - uli

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META TOPICPARENT	name="MoreSensors"

The 2 line LCD display.

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a 4-bit mode where the data bits are transferred in 2 successive cycles on the upper 4 data lines (D4-D7) while the lower 4 bits are used to drive the control lines

Our I2C interface uses the 4-bit mode and is connected as follows:

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The display can be used in a multitude of applications. When running with the realtime clock for example it may display date and time while when running with the PCF8591 ADC it may show an input voltage and in this way transform our Raspberry Pi into a simple voltmeter. The left value is an 8 bit hex value directly read from the ADC while the second is the value converted into Volts under the condition that the PCF8591 is connected to Vcc=3.3V.

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META FILEATTACHMENT	attachment="pcf8574ifce.png" attr="" comment="" date="1485957577" name="pcf8574ifce.png" path="pcf8574ifce.png" size="65250" user="uli" version="1"
META FILEATTACHMENT	attachment="voltmeter.png" attr="" comment="" date="1486214517" name="voltmeter.png" path="voltmeter.png" size="675546" user="uli" version="1"
META FILEATTACHMENT	attachment="hd44780.tar.gz" attr="" comment="" date="1507551592" name="hd44780.tar.gz" path="hd44780.tar.gz" size="262163" user="uli" version="1"

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META FILEATTACHMENT	attachment="hd44780-pcf8574circuit.png" attr="" comment="" date="1510854307" name="hd44780-pcf8574circuit.png" path="hd44780-pcf8574circuit.png" size="67950" user="uli" version="1"

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