| 摘要 |
PURPOSE:To utilize a microcomputer effectively by outputting a pulse width modulated wave, obtained by sweeping a duty ratio, from the microcomputer, and discriminating a remote operation mode by comparing a DC voltage obtained by averaging said output with a DC voltage from a remote operatin part. CONSTITUTION:A DC voltage Vin transmitted from a remote operation part 1 is compared by a comparator 19 with a mean DC voltage Vref obtained by smoothing a pulse width modulated wave PWM with a duty raio tau, outputted from a microprocesser 5, by a smoothing circuit 11. When the remote operation button 2 of the remote operation part 1 is pressed, an output is detected by a comparator 10. At this time, when the operation button 2 is pressed, the output voltage Vb of the comparator 10 goes down to a level L, and the output voltage Vout of a logical arithmetic circuit 12 falls. On detecting this falling, the computer 5 starts remote operating processing to duscriminate remote operation on the basis of a duty ratio when the voltage Vout varies. Consequently, the computer 5 performs another process when the operation button is not pressed. |
