Electronic curvimeter. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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This simple device allows you to measure the length of any line - both straight and curved.
The schematic diagram of the electronic curvimeter is shown in fig. one.
Technical specifications
- Maximum measured distance, cm......999
- Measurement error, cm......±05
- Supply voltage, V ...... 9
- Current consumption, mA......10
An optoelectronic pair, the role of which is performed by the HL1 LED and the VD1 photodiode, is required in the measuring unit. On microcircuits DD1 ... DD3, a summing device and a binary-to-decimal converter are assembled. The result obtained is displayed on a three-row digital liquid crystal display (LCD) HG1. To ensure the normal operation of the LCD, the segments of the indicator are powered by an alternating voltage from a rectangular pulse generator with a frequency of 50 Hz, assembled on a DD4 chip. Capacitors C1 ... C3 are necessary to protect the microcircuits DD1 ... DD3 from electrical interference.
The measuring unit of the device (Fig. 2) consists of a rubber roller mounted on a metal shaft, at the other end of which an aluminum screen with four cutouts is fixed.
The shaft is placed in a metal tube, firmly installed in the hole in the instrument housing. The inner diameter of the tube is slightly larger than the diameter of the shaft so that the latter can rotate freely. On opposite sides of the screen are the HL1 LED and the VD1 photodiode, mounted on a plastic holder, which is attached to the bottom of the device case.
When measuring, a roller is carried out along the measured line. The roller rotates, and consequently, the screen also rotates, opening and closing the photodiode VD1 four times in one revolution from the light rays of the HL1 LED. Since the circumference of the roller is chosen equal to four centimeters, each pulse that appears at the output of the photodiode VD1 when it is illuminated by the LED HL1 corresponds to one centimeter of the distance traveled. The design of the measuring unit is made in such a way that during the measurement process, exactly as many pulses appear at the output of the VD1 photodiode as there are centimeters in the measured length. It remains only to count these impulses, and display the result on the light board. This function is performed by microcircuits DD1 ... DD3 and a sign-synthesizing indicator HG1.
The entire electronic part of the device (except SA1. SB1, VD1, HL1) is assembled on a printed circuit board made of double-sided foil fiberglass 1,5 mm thick.
On fig. 3 shows the location of the conductors on the board from the side of the installation of microcircuits and parts. On fig. 4 - the location of the conductors from the soldering side. The LCD is located above the DD1 ... DD3 chips after they are installed. The LCD leads are soldered to the designated points. Capacitors C1 ... C3 are soldered directly to the corresponding power pins of the DD1 ... DD3 microcircuits.
The roller in the measuring unit is made of 10 mm thick rubber. Its circumference is four centimeters. It must be adjusted with maximum accuracy: after all, the measurement error depends on this. An electronic curvimeter does not need to be adjusted. With proper installation and serviceable parts, it is ready for operation immediately after turning on the power.
Author: A.Mokhorev, Chashniki
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