Introduction Counting is one of the simplest basic operations. The counter is the logic circuit that implements this kind of operation. In the digital system, the counter mainly counts the number of pulses to realize the functions of measurement, counting and control, and also has frequency division. Function, the counter is composed of a basic counting unit and some control gates. The counting unit is composed of a series of triggers with functions of storing information. These triggers include RS trigger, T flip-flop, D flip-flop and JK. Trigger, etc. Counters are widely used in digital systems. For example, in the controller of an electronic computer, the instruction address is counted in order to sequentially fetch the next instruction. When multiplying and dividing in the arithmetic unit, the number of addition and subtraction is recorded, and the number is subtracted. Counting pulses in the instrument, etc. The counter can be used to display the working status of the product. Generally speaking, it is mainly used to indicate how many copies of the product have been completed. Its main indicator is the number of bits in the counter. Commonly there are 3 and 4 bits. Obviously, the 3-digit counter can be displayed up to 999, and the 4-digit maximum can be displayed to 9999. Software Description The counter application includes records of categories such as call, SMS, data, etc., and supports the user to select the clear date and add the reminder value according to the category. For example, the user can select any day of the month, or the first day and the last day as the recording cycle. On the day of clearing, add a reminder node for the duration of the call, the number of SMS messages, and the number of data traffic. The counter has industrial features: 1. There are 6 LED digital display; 2. There are two A and B counting inputs at the same time; 3. The counting frequency can reach 20KHz; 4. It also has LED warning light indication; 5 At the same time, it supports RS485 and RS232 serial interfaces. The output, power supply and communication are mutually isolated by photoelectric isolation. The colony counter is an image capture device that collects images, analyzes the images by computer, automatically counts and measures macroscopic colonies or plaques formed by bacteria growing on solid medium, and is widely used in food, beverages, medicines, and organisms. Inspection of bacteria in products, cosmetics, sanitary products, drinking water, domestic sewage, industrial wastewater, clinical specimens According to the bacterial count test procedure, the number of colonies growing in a petri dish exceeds 300 hours. The test sample should be diluted and re-worked to ensure the accuracy of the count. Note 1. The instrument should be placed on a flat and firm test bench. 2, when the number of colonies, the pen should not be too tilted, gently click down to have a bouncing sense, you can hear the "beep" sound, such as tap too heavy, easy to damage the pen. 3, the instrument should be moisture-proof, anti-violent vibration, direct sunlight exposure, acid and alkali corrosion, dust cover should be added after use. 4. Pay attention to prevent bacterial contamination counting pool. 5. If the instrument does not count, you can press the test button. If counting, the counting pen is broken. If it still does not count, it means that the instrument itself has a problem. If it is found to be faulty, please do not disassemble it. Please have it checked by experienced technicians or overhauled by our factory. Instructions 1. Plug the power plug into a 220 volt power outlet. 2. Insert the pen plug into the jack on the instrument. 3. Turn the power switch to “ONâ€, the light in the counting pool is on, and the digital display should be “000â€, indicating that counting is allowed. If the number is not "000", press the reset key 4. Place the Petri dish to be inspected (the bottom of the dish is facing up) into the counting cell. 5. Count all the colonies one by one on the bottom of the culture dish with a counting pen. Each number should be heard as "beep" to indicate that it is valid, otherwise it should be focused. At this point, the colonies that are clicked are marked with colors, and the displayed numbers are automatically accumulated. 6. Check carefully with a magnifying glass to confirm that the points are not missing, and the counting is completed. 7. The number shown is the number of colonies in the dish. 8. Remove the culture dish after recording the numbers. Press the “0†key to display the recovery “000†and prepare for the counting of another dish. 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