Toothpick Bridge Template

... Measuring the speed radar.

After much time I open the blog again to start a new project ...

designed circuit is capable of measuring the velocity of an object passing between two sensors, the "heart" of the circuit is the Arduino system, which is a section on this page.

This radar is capable of measuring speeds between 0 and 500km / h, once it detects the speed displayed on a backlit LCD screen, send a message to the PC and if the measured speed exceeds the specified will activate a camera and displays a message on both screens (PC and LCD).

A sensor detects the passage of the object and stores a time constant, passing through the second sensor keeps a second time constant to measure the time it takes to pass between the two sensors, subtracts the time of the first sensor while the second sensor.

Then follow the data to convert to Km / h.

! Sensors are 10 cm away!


Parts list
· Arduino Duemilanove.
· LCD display hitachi blue 44780. 16x2.
· Sensors sharp 2D120X
· 4.7 K potentiometer
· Serve Futaba S3003
alpha * Software Arduino 0013. Sensor

sharp 2D120X
The sharp 2d120X analog sensor is a distance, has an analog value in relation to the object distance, the greater the distance less stress and vice versa.

can see their data sheet on this page:
http://www.datasheetcatalog.org/datasheets/480/87977_DS.pdf

The function of the servo, is none other than pressing the button shutter of the camera ... (not available for PC-controlled camera, or with remote trigger.) The servo makes a little money at the time of activation of the "radar" you press the shutter button.

to activate the radar also activates the exit 13 of the arduino where we can connect a trigger "more professional" for example a camera or flash.

to handle any cargo from the arduino need to use a relay to do so assemble this circuit:

The complete circuit has been mounted as follows:

The code rduino program is as follows:

# include # define route 50
radar 13 # define MAX 50 # define

Tiemposensor1 unsigned long int, Tiemposensor2 / / declare variables int long
RealTime;
int x, x2;
int distance = 400;
sensor1 int = 0;
sensor2 int = 1;
float speed;
LiquidCrystal
lcd (12, 11, 10, 5, 4, 3, 2); / / are chosen to control the LCD pin
void setup () {
Serial.begin (9600) / / 9600 baud transmission rate
pinMode (sensor1, INPUT) / / sensor 1 and 2 as inputs.
pinMode (sensor2, INPUT);
pinMode (radar, OUTPUT) / / Output radar

} void loop () {x = analogRead
(Sensor1) / / read the sensor 1 until the distance is less than the selected

do {x = analogRead (sensor1)
} while (x < tiemposensor1 =" millis();" x2 ="analogRead" x2 =" analogRead" tiemposensor2 =" millis();" tiemporeal =" (Tiemposensor2" velocidad =" ((0.1" velocidad =" espacio/"> MAX) {/ / if the speed is greater than the maximum speed
predefined digitalWrite (radar, HIGH) / / active radar
the delay (200);
digitalWrite (radar, LOW);
Serial.print ("Excessive speed ... RADAR ON") / / message on the Serial.println
PC screen (speed);
lcd.clear ();
lcd.home ();
lcd.print (ON RADAR !!!"); / / message on the LCD
delay (500) ;
}}

example of an image taken by the "radar" with a model:

collaborated in this project to David Alfaro Muñoz.

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rhythm lights
3 channel

audio signal is picked up by the microphone which is powered by a 1.8 kΩ resistor. The capacitor of 100 nF decoupling is responsible for letting the continuous RF signal only. The first operational amplifier (A1) is responsible for the initial pre-amplification signal whose gain (sensitivity) is adjusted using potentiometer 1 MW positioned as feedback controller. A second amplifier stage (A2) is responsible for raising a little more level audio signal for delivery to the last amplifier stage (A3) which is arranged as a voltage follower to present a high input impedance and low output impedance, this well prepared for the next three filters do not interact with each other causing malfunction.
If you want to enter the audio signal directly from a speaker can put together a stage of isolation and impedance matching.

In this case the audio signal, either directly from a speaker, go to a knob that can adjust the sensitivity. The transformer used is a common one used in the output stage transistor radios as Spica. In its high-impedance winding (Hz) signal is input and out the low (Lz) thus producing insulation. Remember that the mass in the system is connected directly to one of the terminals of the grid which means extreme danger in case of making a wrong connection.
Next, the amplified audio signal properly and with proper impedance enters the filter module and electric drive.


The first filter (top) passes only the signals that are lower than 500Hz (woofer) that are amplified by the transistor and trigger the power triac shining lights to the rhythm of the sounds of low frequency.
The second filter (center) passes the signals whose frequency is between the 500Hz and 2.5KHz (mids) that are amplified in the same way as the previous module and also trigger a triac to command the lights.
Finally, the bottom filter is responsible for signals to pass frequencies above 2.5KHz, causing them to glow the lights to the beat of the treble.
All three knobs are arranged in charge of regulating the amount of brightness for each channel lights.
Assembly:
With a cooler can be mounted three triacs, making sure that the terminal fin common to all three components, thus achieving efficient heat dissipation. Under these conditions can be hung up to 1500W of power incandescent lights on each channel. For more power can be put more transistors and triacs in parallel.
have to pay close attention when you arm the system and the common ground that goes from the microphone until the last stage of power triacs, is connected to one pole of the electrical grid so it is possible that if not done properly isolates received electric shocks. A crucial point is the microphone capsule has its negative terminal connected to the metallic coating. If the capsule is not isolated (placing it in a thermos cover shrink-wrapped or in a small plastic box) may be shocked by just touching it.
the marking on the front of the box on each channel can be placed LED diodes of different colors directly across 220V output of each channel. This requires placing each LED current limiting resistor of 22 kΩ. We recommend using high brightness LEDs for optimal viewing. You can also place a power indicator LED in parallel with the output of the power supply, in this case the resistance should be 1 kW. If you are using a flashing LED will be placed in parallel with it a capacitor of 100 nF to prevent the flash produces noise in audio amplifiers or mixer.
Seen from the front, with inscriptions visible and down the connection terminals of the triac are, from left to right: Terminal 1, Terminal 2 and Fire.


Power:
§ v max: 12v dc simple
§ I max: 0.5

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4 microphone mixer
This circuit is often used in panel discussions or meeting rooms to capture the audio from all partners without the need to give each a microphone. Putting this in the middle of the table captures the audio from each of them through which is formed by four electret capsules with a level control for each individual receipt.

We can say that This circuit consists of a hand of four electret modules, each providing power to the capsule through the resistance of 10 k Ω, DC blocking capacitor through 1 uF and put that sign on the end result AF a potentiometer that serves as a reception setting.

opposite end point becomes mute ground to allow that side of the table while the central point is derived from the final signal output. The 100 k Ω resistors and FET transistor form a summing network and pre-amplified signal something which can be applied without problems in both line input and a microphone channel a console. WIRING

output type must be shielded to prevent the resulting sound is "invaded" by interference or noise.

Another recommendation that is not in the scheme is to place a 100 nF capacitor between + V and PCB mass within the unit.
potentiometers to adjust the sensitivity of each of the microphones. This is useful when one side of the table there are more people than the other or when a person speaks too high compared to others. Food

:
§ V max: simple DC 9V
§ I max: 0.1A