Speedcontrol

Generell

With this measuring device the actual speed can be determined.

Application
Lightning: Fast vehicles are indicated by the "speed trap". However, no radar beam is used for measurement.
(The circuit can also be used without display)
Speed display: Like on some school roads, an display can be placed beside the road
Technology The "flash light" is triggered by minus.
You can setup a Servotiny or a speed-dependent Servo junction. Fast vehicle drive straight forward, slower to be diverted to the parking lot or gas station

Function

The time is measured with 2 Sensors, Light barriers, Feedbacksensors#Reedswitches or Hallsensor what the vehicle need to drive about 15cm. The sensors must switch to minus.

Setup

2 Jumpers are used to set the scale: H0, TT, oder N The dislay shows the speed in km/h. By pressing the button, the velocity is displayed. Above this speed the vehicles will be flashed. The speed can be adjusted with the potentiometer.

Maßstab S1 S2 H0 +5 +5 TT +5 GND N GND GND

Geschwindigkeitsmessung mit Blitz bei Geschwindigkeitüberschreitung

Parts

Special parts

ATMEGA8_DIP28	programmed by Claus Ilchmann
Plate	made by DC-Car of Claus Ilchmann

Common parts

1	C1	470uF
3	C3,C4,C6	1uF
2	CON1+4	3,5 mm 4 Pol- Screw-Connector
1	D1	1N400X
1	F1	Polyfuse 2A
1	IC2	78S05
2	JP1/JP2	Solder bridge
1	LED1	LED
13	R1-8,R11-15	680
1	R9	50K
1	R10	47
1	R16	10K
1	S1	Pushbutton

Additional Parts
Two Seven-Segment Display with common anode. They are available in different sizes.
Every segment has its own anode which are connected to the one, ten, and hundreds contact of the plate.