Description
AD analog-digital conversion board to learn the core IC uses an 8-way 8-bit AD converter ADC0809 chip, the board can measure 8 0 – 5V voltage value, and in turn on four LED digital display or a single selection show , measuring a minimum resolution of 0.019V, the measurement error of 0.02V, we can be made into multi-channel digital voltmeter.
First, resistance welding, soldering components to follow from the smallest start the installation.
Then, install welding diodes, transistors, capacitors, IC and other direct plug-in.
Continue the installation components, the final welding on the size of the largest connector.
Finished product, completed!
Basic principles:
ADC0809 is a sampling frequency of 8-bit, successive approximation principle to analog – digital conversion device.It is equipped with an 8-channel multiplexer, which can address code is latched decoded signal, it selects only eight analog input signals in a for A / D conversion.ADC0809 analog input signal requirements for unipolar voltage range is 0-5V, if the signal is too small, must be enlarged; analog input during the conversion process should remain the same, should the analog changes too fast, you need tobefore the increase in the input sample and hold circuit.Microcontroller board using STC89C51 learning, minimize application design, using common anode seven-segment LED display, P1 port output Segment data, P3.0-P3.3 to do column scan output, in order to improve the anode voltage LED drivers, using 9012for power-driven output.
Board resources 51MCU, 4-digit LED display, four key inputs, 8 8-bit AD converter ADC0809, way adjustable analog voltage input (0 – 5V), ISP download interface (via RS232 serial download, the use of moreconvenience), LCD1602 LCD interface, relay output, buzzer.
Packaging Details
- 1 X AD analog-digital conversion board
- 1 X RS232 serial cable (ISP download program)
- 1 X External power supply
- 1 X Supporting CD-ROM (including the learning board hardware and software information)
You can see more information and details in Chinese webpage:
http://www.hificat.com/ad/ad.html