PCF8591 A/D D/A Converter Module (with on-board Light and Temp. Sensor)

A/D D/A converter module (PCF8591)

โมดูล Analog to Digital  และ Digital to Analog ขนาด 8 บิตนี้ จำนวน 4 Channel นี้ ทำงานโดยใช้ 8-bit successive approximation A/D conversion ซึ่งใช้ PCF8591 รวมทั้งยังมีเซ็นเซอร์แสงและอุณหภูมิอยู่บนโมดูลมาพร้อมเลย

คุณลักษณะ

• Main processing chip of the module is PCF8951
• Module PCB size: 3.6cm*2.3cm
• The module adopts standard double panel, the board thickness is 1.6mm , the layout has through holes around it. The aperture is 3mm.
• The module has a power indicator (the indicator will light when the module is powered)
• The module has a DA output indicator. When the output voltage of the module DA output reaches a certain value, the DA output indicator on the board will be illuminated. The higher the voltage, the more obvious the brightness of the indicator.
• The module supports external 4- channel voltage input acquisition (voltage input range 0-5v )
• Module integrates photoresistor for accurate ambient light intensity acquisition via AD
• Module integrates thermistor for accurate ambient temperature measurement via AD
• Module integrates 1 channel 0-5V voltage input acquisition (adjust the input voltage through blue and white potentiometer)

The left and right sides of the module and the short-circuited pins in the middle are described as follows:

Left J4 pin header

J5 pin on the right 

Intermediate shorting piece 

Note: Do not short the J1 , J2 , J3 shorting pads when using external AIN0~AIN3.

An I2C communication routine for the STC89C52RCmicrocontroller and the PCF8591 module is provided in this module package.

AIN0 : V_AD0 thermistor channel acquisition voltage

AIN1 : V_AD1 photoresistor channel acquisition voltage

AIN2 : V_AD2 potentiometer adjusts the voltage collected by the channel 
AIN3 : V_AD3 reserved channel acquisition voltage ( after shorting AOUT , collecting DA output voltage)
AOUT : V_DA analog voltage output (2.5V analog voltage is written in the test software)