Microcontroller Based Projects

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Automatic Railway Gate Control & Track Switching( LATEST)
Put Coin And Draw Power (latest) for Electrical and Electronics.
Intelligent Train Engines ( New-Latest)
VEHECLE MONITORING AND SECURITY SYSTEM
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1. FASTEST-FINGER-FIRST USING 89C51
2. MICRO PROCESSOR BASED REVERSIBLE D.C. MOTOR CONTROL
3. MOVING MESSAGE DISPLAY 8085 MICROPROCESSOR(LATEST)
4. PC16F84- BASED CODED DEVICE SWITCHING SYSTEM
5. STEPPER MOTOR CONTROL USING 89C51
6. MIC-89C51 MONITORING SYSTEM(LATEST)
7. MANUAL AT 89C51 PROGRAM
8. AT 89C2051 BASED COUNTDOWN TIMER
9. MICROCONTROLLER BASED CODE LOCK USING AT 89C2051
10. LCD FREQUENCY METER USING 89C2051
11. CALLER ID UNIT USING MICRO-CONTROLLER
12. PIC 18 F 84 MICRO-CONTROLLER BASE CODE DEVICE SWITCH SYSTEM
13. MICROPROCESSOR-BASED HOME SECURITY SYSTEM(LATEST)
14. STEPPER MOTOR CONTROL USING 89C51 MICRO-CONTROLLER
15. MICRO CONTROLLER BASED TEMPERATURE METER(LATEST)
16. MICRO CONTROLLER BASED HEARTBEAT MONITOR
17. RS232 ANOLOG TO DIGITAL CONVERTER USING AT89C51 MCU
18. ULTRASONICRANGEFINDER USING PIC MICRO CONTROLLER
19. CALLER- ID UNIT USING MICRO CONTROLLER
20. MICRO CONTROLLER BASED PATHFINDER(LATEST)
21. MICRO CONTROLLER BASED ROBOT.(LATEST)
22. MICRO CONTROLLER MOVING MESSAGE DISPLAY(LATEST)
23. MICRO CONTROLLER BASED RELAY SWITCHING
24. MICRO CONTROLLER AUTO DIALER USING GSM.
25. MICRO CONTROLLER BASED WATER LEVER INDICATOR(LATEST)
26. MICRO CONTROLLER BASED WIRELESS HOME AUTOMATION(LATEST)
27. MICROCONTROLLER BASED RADAR SYSTEM(LATEST)
28. MULTI CHANNEL INFRA RED CONTROL 4 different point 89c2051 micro controller in transmitter and receiver, using infra red technique.
29. MOVING MESSAGE DISPLAY : 89c51 micro controller Led matrix,
30. Digital clock with alarm: using 89c51 micro controller
31. TRAFFIC LIGHT WITH DOWN COUNTER : all the four sides of the road with one side counter display using 89c51 micro controller circuit.
32. ULTRASONIC DISTANCE METER USING MICROCONTROLLER
33. PRI-PAID CAR PARKING SYSTEM
34. MULTILEVEL CAR PARKING BY MCU
35. MICRO CONTROLLER TEMPERATUIRE METER
36. ANOLOG TO DIGITAL CONERTER USING AT89C51 MCU
37. INFARED REMOTE CONTROLE SYSTEM
38. ULTRASONIC MOVEMENT DETECTOR
39. MICROCONTROLLER BASED TACHOMETER
40. MCU BASED VISITOR COUNTER
41. PWM CONTROL OF DC MOTOR USING 89C51
42. AN INTELLIGENT AMBULANCE CAR WHICH CONTROL TO TRAFFIC LIGHT
43. PRE-PAID ENERGY METER
44. MICROC CONTROLLER BASED LINE FOLLOWER OR TRACING ROBOT
45. AUTOMATED WALKING ROBOT CONTROLLED BY MCU
46. AUTO BRAKING SYSTEM
47. AUTOMATIC RAILWAY CROSSING GATE CONTROLLER
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Simple Electronic Combination Lock using IC LS 7220
Simple Electronic Combination Lock using IC LS 7220
Simple Electronic Combination Lock using IC LS 7220
Description
This is the circuit diagram of a simple electronic combination lock using IC LS 7220.This circuit can be used to activate a relay for controlling (on & off) any device when a preset combination of 4 digits are pressed.The circuit can be operated from 5V to 12V.
To set the combination connect the appropriate switches to pin 3,4,5 and 6 of the IC through the header.As an example if S1 is connected to pin 3, S2 to pin 4 , S3 to pin 5, S4 to pin 6 of the IC ,the combination will be 1234.This way we can create any 4 digit combinations.Then connect the rest of the switches to pin 2 of IC.This will cause the IC to reset if any invalid key is pressed , and entire key code has to be re entered.
When the correct key combination is pressed the out put ( relay) will be activated for a preset time determined by the capacitor C1.Here it is set to be 6S.Increase C1 to increase on time.
For the key pad, arrange switches in a 3X4 matrix on a PCB.Write the digits on the keys using a marker.Instead of using numbers I wrote some symbols!.The bad guys will be more confused by this.
Circuit Diagram .Click to Enlarge. Pin Assignment of LS7220.
C1 1 1uF 25V Electrolytic Capacitor
C2 1 220uF 25V Electrolytic Capacitor
R1 1 2.2K 1/4W Resistor
Q1 1 2N3904 NPN Transistor 2N2222
D1 1 1N4148 Rectifier Diode 1N4001-1N4007
K1 1 12V SPDT Relay Any appropriate relay with 12V coil
U1 1 LS7220 Digital Lock IC
S1-S12 12 SPST Momentary Pushbutton Keypad (see notes)
HD1 1 12 Position Header
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Fire alarm circuit
Fire alarm circuit
Fire alarm circuit
Description.
Here is a simple fire alarm circuit based on a LDR and lamp pair for sensing the fire.The alarm works by sensing the smoke produced during fire.The circuit produces an audible alarm when the fire breaks out with smoke.
When there is no smoke the light from the bulb will be directly falling on the LDR.The LDR resistance will be low and so the voltage across it (below .6V).The transistor will be OFF and nothing happens.When there is sufficient smoke to mask the light from falling on LDR, the LDR resistance increases and so do the voltage across it.Now the transistor will switch to ON.This gives power to the IC1 and it outputs 5V.This powers the tone generator IC UM66 (IC2) to play a music.This music will be amplified by IC3 (TDA 2002) to drive the speaker.
The diode D1 and D2 in combination drops 1.4 V to give the rated voltage (3.5V ) to UM66 .UM 66 cannot withstand more than 4V.
Circuit diagram with Parts list.
Notes.
- The speaker can be a 8Ω tweeter.
- POT R4 can be used to adjust the sensitivity of the alarm.
- POT R3 can be used for varying the volume of the alarm.
- Any general purpose NPN transistor(like BC548,BC148,2N222) can be used for Q1.
- The circuit can be powered from a 9V battery or a 9V DC power supply.
- Instead of bulb you can use a bright LED with a 1K resistor series to it.
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Lead acid battery charger circuit
Lead acid battery charger circuit
Lead acid battery charger circuit
Description
Here is a lead acid battery charger circuit using IC LM 317.The IC here provides the correct charging voltage for the battery.A battery must be charged with 1/10 its Ah value.This charging circuit is designed based on this fact.The charging curent for the battery is controlled by Q1 ,R1,R4 and R5. Potentiometer R5 can be used to set the charging current.As the battery gets charged the the current through R1 increases .This changes the conduction of Q1.Since collector of Q1 is connected to adjust pin of IC LM 317 the voltage at the output of of LM 317 increases.When battery is fully charged charger circuit reduces the charging current and this mode is called trickle charging mode.
Circuit Diagram with Parts List.
Notes .
- Connect a battery to the circuit in series with a ammeter.Now adjust R5 to get the required charging current. Charging current = (1/10)*Ah value of battery.
- Input to the IC must be minimum 15V to get 12 V for charging the battery .Take a look at the data sheet of LM 317 for better understanding.
- Fix LM317 with a heat sink.
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