| 摘要 |
PURPOSE:To secure excellent wireless communication at all times and to provide a crew to battery replacement or the like by providing a confirmation means of a power supply voltage to a transmitter for the wireless remote commander employing an infrared ray or a radio wave or the like. CONSTITUTION:A voltage confirmation section 2 is connected to a power supply battery 1 to apply a power supply voltage Vcc of +3V to each section of a transmitter. On the other hand, the transmitter is provided with an input switch section 3 having a key switch SW or the like to accept the operation, a microcomputer section 4 to discriminate the input and to generate a remote command code, a display use infrared ray LED section 5, and a transmission section 6 sending a generated remote command code in an infrared ray wave. Then a resistance of each resistor of the voltage confirmation section 2 is decided to a prescribed constant, and the LED 2 is lighted when the power supply voltage Vcc is 2V or over and the LED 1 is lighted when the power supply voltage Vcc is 2.5V or over by the constants. Thus, it is indicated that the power supply voltage Vcc is not enough when both the LEDs 1, 2 are not lighted and it gives a crew to the replacement of the battery 1. |
