Difference: PCF8591 (3 vs. 4)

Revision 42017-02-05 - uli

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META TOPICPARENT name="MoreSensors"

Analogue to Digital and Digital to Analogue Conversion

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  There are 2 LEDs on the PCB: a red one showing that the board is powered and a green one connected to the DAC output.
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<		I used the forth channel to feed back the DAC output.
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>		I used the free channel to feed back the DAC output.
 
pcf8591front.png pcf8591back.png
pcf8591 front pcf8591 back
You can distinguish the PCF8591 chip, the potentiometer and the photo resistor and thermistor. The pins on the left make the connections to external analogue signals and 1 pin provides the DAC output while the pins on the right implement the I2C interface with SCL, SDA, Vcc and Gnd.
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