Place this "dog" (toy robot dog) within 2 to 3 meters from the mobile phone. When there is an incoming call or a signal, the dog will light up and lift the foot to remind you that "there is a call!". Suitable for use inside or outside the car.
This article refers to the address: http://
A commercially available simple teller that picks up a signal by picking up a coil and detects (rectifies) the diode, then illuminates the LED. This teller must be within a few centimeters of the phone.
The figure is the circuit introduced in this paper. The resonant circuit tuned to 1.45GHz is used to pick up the signal transmitted by the mobile phone. After detection, it is converted into a digital signal by the comparator, and the square wave generator is driven to output the ON/OFF signal. The output square wave signal flashes the LED in the dog's eye while driving the motor to step the dog.
The tuning and detection circuit tuning circuit adopts a Lecher line with one end short-circuited (a transmission line for detecting the RF frequency), and also serves as a receiving antenna, which can be fabricated on the copper foil surface of the printing plate according to the dimensions marked in the drawing, and the copper foil line width is 0.5-0.7. Mm, surface tin. The tap position is 5mm from the ground, and the best point can be tested during commissioning. The detection uses a Schottky fast recovery diode.
The comparator circuit detects the output signal amplitude from about mV to several hundred mV. In order to remove the interference of other noise, the op amp is connected to a comparator to make it react to a signal below a certain voltage value. The potentiometer VR1 can adjust the sensitivity, and the threshold voltage can be adjusted within the range of 15mV and 0.56V. Oscillation start signal The signal from the mobile phone is a pulse of 20ms interval, and the pulse width is only a few hundredms, which is not suitable for directly driving the robot dog. When the comparator outputs a high level, the capacitor C2 is quickly charged via the diode D2; when the output is low, C2 is discharged through R4, and a delay of about 1 s is obtained. In this way, even if the mobile phone signal is interrupted (within 1 s), the drive dog can be guaranteed. The square wave oscillating circuit is connected to a square wave oscillator by an operational amplifier.
Production and adjustment
The tuning and detection circuit is a high frequency circuit, and the component distance and wiring should be as short as possible. C1 can be welded directly to the ends of D1 without being connected via a foil. The robot dog uses a commercially available small light control toy dog, which has a photoresistor and a foot drive motor inside. It is necessary to install an LED in the dog's eye and the photoresistor is opposite to the LED, and a light-transmissive color film is attached to the eyelet. After the whole machine is powered on, when there is a mobile phone to transmit information, adjust VR1 clockwise to make the LED flash, then when there is no mobile phone information, the LED goes out. If it does not go out for more than 3 seconds, you need to adjust VR1 counterclockwise to reduce the sensitivity. This machine is designed for the 1.5GHZ band. If it needs to work in the 800MHZ band, the Lechel line test can be appropriately extended.
Our company offers rubber, and specialty seal and o-ring for molding electronic and electrical Connectors, both circular and rectangular types. We have in house capabilities and quick turn around.
Cable Grommets with various Grommet Shapes, Rib Styles, Slot Shapes, Inner Flanges, and Colors - To have access to our 3D Cable Grommet Design Tool
Silicone Rubber Products,Cable Silicone O-Ring,Rubber Seal,Custom Silicone Seal,Waterproofing O-Ring,Tpe Grommet
ETOP WIREHARNESS LIMITED , http://www.etopwireharness.com