Number of rotations detector circuit
The photo-coupler is used in order to detect the number of rotations of a rotor which rotated by wind velocity.
In the left figure, the disk with a slit is drawn on the photo-coupler part. A horizontal line is the axis of rotator and the portion of a dotted line is a slit.
USB drive circuit
![](gif/pic6_f3_03.gif)
Serial interface is used for the interface of USBN9604 and PIC of the USB driver.
USBN9604 is equipped also with the parallel interface in addition to serial interface. Since high-speed transmission is unnecessary in the case of this circuit, the serial interface with few signal wires is used.
This is the interface called MICROWIRE/PLUS. With this interface, four lines, CS, SK, SI, and SO, are used. This mode is set up, when MODE1 is made into H level and it makes MODE0 L level.
An INTR line is a signal wire for the interruption control.
Since the signal wires for parallel interfaces (D1-D7) are not used in this circuit, they are grounded in order to avoid the bad influence to the circuit.
Clock oscillating circuit
![](gif/pic6_g3_07.gif)
This is the oscillating circuit which makes the operation clock of PIC. The 20MHz oscillator is used with this equipment.
Power supply circuit
![](gif/pic6_f3_04.gif)
In order to supply stabilized +5V powe to the PIC and the USB driver, 3 terminal regulator is used.
The consumption current of the USB driver is about 30mA and PIC16F873 is about 10mA.. Therefore, the 100mA type regulator is used.
|