This module adopts new AD/DA chip PCF8591.

The module A / D input and D / A output definition, the module has four A / D input, 1 channel D / A output:

• A / D input channel 0: Connect external testing;
• A / D input channel 1: one potentiometer rheostat partial pressure can be measured; connect an external test
• A / D input channel 2: the way the thermistor temperature can be measured; connect an external test;
• A / D input channel 3: the way the photosensitive resistor metering strong; connect an external test;
• D / A output channel 0: all the way through the brightness of the LED display D / A output voltage can produce sine, square, triangle, and other waveforms.