In view of the shortcomings of slow manual testing of the infrared remote controller and the possibility of misdetection, according to the test requirements of the infrared remote controller, a fast infrared remote controller test device that can match the assembly line operation is designed. Control circuit design and test flow chart. Prototype tests show that the test device can achieve rapid and accurate testing and screening of various technical indicators of different models of infrared remote controllers, effectively improve the test methods of the remote controller production line, and increase production efficiency.
introduction
At present, the whole infrared remote control test work is still done by hand. On the one hand, imperfect testing results in hidden product quality risks, and the lack of quality guarantees reduces the credibility of the product. On the other hand, it affects production efficiency and reduces the competitiveness of enterprises in the market.
The remote control test items are mostly related to key operation. The design of fast automatic keys is more difficult, and the number and layout of keys of different types of remote controls are different, so the design of remote control detection devices is more difficult. At present, there is no Such a device appears. In this paper, based on the analysis of the requirements of the remote control machine test, a comprehensive test device for infrared remote control is designed. This device implements quick key operation of infrared remote control, verification of infrared emission code, measurement of infrared emission power, infrared The measurement of the emission angle and the measurement of the standby current, and by modifying the test text, it is possible to quickly test and filter different types of remote controllers.
1 Working principle
FIG. 1 is a structural diagram of an infrared remote control integrated test device. The remote controller under test is sent in from the entrance through the guide rail. The qualified products are sent from the exit to the packaging section. The unqualified products are sent back to the repair section by the sorting mechanism. The tooling fixture is a positioning clamping mechanism. When the remote control enters the test station, the system will detect and start the tooling fixture to fix the remote control in the test position. The test platform is equipped with the same number of pneumatic nozzles according to the keyboard layout of the remote control. After the high-pressure air flow is ejected from the nozzle, it will squeeze the corresponding button to simulate the manual button action. The test platform simultaneously detects the infrared code, transmission power, and transmission angle . The sorting mechanism is used to separate the remote control. When an unqualified remote control is detected, the sorting mechanism activates the cylinder to move the remote control from the top of the transmission line to the unqualified product station. The PC controls the operation of the entire test device. It directs the valve operation of the test platform, reads the test data of the platform, judges whether the remote control is qualified, and issues a sorting command. It is the core of the entire test device. Instructions.
The first stage is positioning. The remote control under test enters the test device along the transport rail from the entrance. After the system detects it, it will start the tooling fixture to clamp the remote control, and at the same time connect the power supply terminal to the battery compartment of the remote control.
The second stage is pre-testing. After the remote controller is assembled, the power circuit cannot be guaranteed to be normal. Power supply to a remote controller with a short circuit in the power system will cause the power supply circuit of the test device to fail. The pre-test phase is added to avoid this phenomenon. Add a low voltage to the power supply terminal of the remote control and test the current. The input impedance of the remote control is calculated. If the impedance is too small, there is a short circuit fault in the power supply system of the remote control. Test it, but send it directly for repair through the sorting system.
The third stage is the testing stage. During the test phase, the remote control is in working state. The test process is carried out according to the test text. The procedure for testing a remote control consists of multiple steps, and each step is called a record. When the test starts, the PC sends test records to the test platform in turn. Each time, the record will specify which pneumatic nozzle is turned on. The test platform receives corresponding actions, the remote control under test emits infrared signals, and the infrared detection head detects The signal waveform, transmission power, transmission angle, etc. are sent back to the PC. After receiving the PC, it compares with the standard waveform data and determines whether the step is correct. After all the recording tests are completed, the PC determines that the remote control passes if it is qualified; if If it is not qualified, it will issue a sorting instruction and print the fault information at the same time.
The fourth stage is the sorting stage. The sorting mechanism receives the sorting instruction from the PC. If the sorting instruction is received, the pneumatic actuator will be activated to push the remote controller through the lower rail and return it to the repair section.
2 Test platform
Most remote control test items are related to key operation, and the key to the test device is to realize key operation quickly and reliably. Figure 2 is a schematic diagram of the key operation. The air intake pipe is connected to the air pump. The solenoid valve controls the air flow. When the solenoid valve is opened, the air flow hits the remote control keyboard and presses the key, so that the key can be quickly used in a non-contact manner. operating.
There are many nozzles on the test platform. Before testing the new type of remote control, the nozzle position of the test platform must be adjusted. Each button of the tested remote control corresponds to a nozzle, the nozzle is uniquely numbered, and the device is designed with a total of 100 The nozzle can meet the requirements of remote control testing.
The test control flow is shown in Figure 3. The main processor uses LPC2214 of NXP ARM7 core. The processor runs at 60 MHz. On-chip has 256 KB of FLASH and 16 KB of RAM. There are 8 10-bit A on the chip. / D converter, PWM output port, multiple configurable GPIO pins, etc.
The processor is connected to the PC via an RS 232 interface. The PC transmits test instructions through the interface and the test platform returns test data through the interface. The test record and the nozzle number in action will be displayed.
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