Digital Level Hardware Circuit Design And Realization

Digital level is a high-tech product that integrates kinds of technologies, such as modern electronic technology, computer software and hardware technology, material and precision machining technology as well as image processing technology. As a leveling surveying instrument, digital level has many advantages in high surveying speed, objective result reading with high precision, easy interface with computer and uniform with in and outdoor operation. Based on the analysis of code structure and measuring principle of different digital levels in being, design of developing circuit is accomplished in which AVR MCU with high performance is the master chip, a CMOS image sensor is used to collect image of bar code ruler and LCD display module acts as the man-machine interface.Experimental results achieving 0.2mm metrical precisions within 30 meter on prototype of digital level indicate feasibility of the design scheme in hardware circuits and also verify the theory of digital level, and this provides a good base for further development of digital level.