Introduction

This is a AD_DA module which has four ADC(analog to digital convert) and a DAC(digital to analog convert), they transform the signal via the I2C bus. This module is based on the PCF8591, the PCF8591 has 4 analog input pins, a digital output pin and a I2C bus. The DAC on the PCF8591 has a resolution of 8-bits, can generate a theoretical signal between zero volts and the reference voltage in 255 steps. There is a thermistor and a photoresistance on the shield, it’s very convenient to convert the signal and measure the temperature and light, there are 3 pins which is covered with the little hat, when put the little hat on the P4 pin, you connect the thermistor into the circuit, put it on the P5 pin means to connect the photoresistance into the circuit and when put the little hat on the P6 pin means to choose the voltage range from 0 to 5V to supply the circuit.

Features

I2C Address:0b1001000x

4 Channel 8-bit A/D convertor

One Channel D/A convertor

On-board temperature sensor(select with jumper P4) and light sensor(select with jumper P5)

Resource

Program

Schematic

Datesheet