New Automotive Combination Switch Detection Device Using AT89S52 as MCU

Recently, a new automotive combination switch detection device based on AT89S52 came out, which solved these problems. It is understood that the new combination switch can accurately detect all the gears of the combination switch and set the sound and light alarm functions to effectively prevent the false detection and individual gear missing detection in the simulation test.

Combination switch detection is a very important part of production. Generally, analog detection method is used, that is, all peripheral circuits of the combination switch are installed on the test bench, and the working status of each gear position is simulated with the indicator light, such as pulling the combination switch to the intermittent gear. Bit, the indicator light should flash intermittently. This kind of detection method has high requirements for workers and it is very easy to cause misdetection and missed detection. The combination switch detection device designed and manufactured by the author uses a single-chip scanning detection program, adding sound and light alarms, reducing the labor intensity of workers, effectively preventing misdetection and missed detection, especially suitable for production site use.

The detection device adopts AT89S52, which is a common market, as the MCU. The chip has simple programming, convenient program downloading, and high cost performance, and is widely applied in the field of industrial control. The detection device sets a qualified indicator of ten gears and an overall qualified indicator for a certain type of combination switch. When all ten gears pass the test, the overall qualified indicator lights up. In addition, in order to focus workers' attention on preventing misjudgments, an overall qualified sound alarm is also set up, and an alarm is issued through voice while the overall qualified indicator is on.

At the same time, the detection device judges whether the switch is good or bad by means of point-to-point scanning of each position of the combination switch, and at the same time, it can also detect whether the internal wiring of the combination switch is correct and whether there is a short circuit between each lead. At the same time, in order to improve the test efficiency, it also adds an automatic test function. When the combination switch is taken, the system automatically resets, and the system automatically starts testing after the next combination switch to be tested is placed.