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SIM800L 数据表(PDF) 45 Page - SIMCom |
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SIM800L 数据表(HTML) 45 Page - SIMCom |
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45 / 73 page  Smart Machine Smart Decision Figure 41: 50 keys reference circuit Note：Do not change the 20KΩ resistor in the diagram. Customer could cascade a less than 1K resistor to enhance the ESD performance, the connection diagram is as following: Figure 42: Keypad reference circuit Whether using a 5*5 keys or 5*5*2 keys, the module can also detect the two buttons pressed. But when using a 5*5*2 button, the same row, column two buttons at the same time can not be detected when pressed, as shown below: Figure 43: Keypad detected SIM800H&SIM800L_Hardware Design_V2.02 45 2015-07-27 |
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