Contents
Section A: Construction Projects
1. Microcontroller based call indicator 3
2. Automatic water level controller 13
3. Digital water level indicator cum pump controller 17
4. PC based data logger 23
5. Lift overload preventor 28
6. Sound operated on/off switch 32
7. Digital clock using discrete ICs 35
8. A bidirectional visitors counter 39
9. Programmer for 89C51/89C52/89C2051 microcontrollers 43
10. Laser based communication link 55
11. Device switching using password 60
12. Remote controlled sophisticated electronic code lock 64
13. Temperature indicator using AT89C52 71
14. PIC16F84 based coded device switching system 78
15. Load protector with remote switching facility 90
16. Voice recording and playback using APR9600 chip 93
17. Dynamic temperature indicator and controller 98
18. Stepper motor control using 89C51 microcontroller 105
19. Microprocessor based home security system 109
20. Safety guard for the blind 115
21. Digital combinational lock 121
22. Ultrasonic lamp brightness controller 124
23. Moving message over dot matrix display 127
Section B: Circuit Ideas:
1. Intruder alarm 135
2. LED based message display 135
3. DC-To-DC converter 137
4. Versatile proximity dectetor with auto reset 137
5. Window charger 138
6. Multiband CW transmitter 139
7. Programmable timer for appliances 139
8. Antibag snatching alarm 141
9. Off timer with alarm 142
10. Over voltage protector 143
11. Fuse cum power failure indicator 143
12. LED based reading lamp 144
13. Mobile cellphone charger 145
14. Smart foot switch 146
15. Doorbell controlled porchlight 147
16. AC mains voltage indicator 148
17. Sound operated light 148
18. Low cost electronic quiz table 150
19. Zener diode tester 151
20. Highway alert signal lamp 151
21. Variable power supply with digital control 152
22. Simple security system 153
23. Low resistance continuity tester 155
24. Child’s lamp 155
25. Clap operated electronic switch 156
26. Light controlled digital fan regulator 157
27. Sensitive optical burglar alarm 158
28. Watchman watcher 158
29. Cell phone controlled audio/video mute switch 160
30. Panel frequency meter 161
31. Random flashing X-mas stars 162
32. PC based DC motor speed controller 163
33. Frequency divider using 7490 decade counter 164
34. Dome lamp dimmer 166
35. Offset tuning indicator for CW 166
36. 8-digit code lock for appliance switching 167
37. Stabilised power supply with short circuit indication 168
38. Light operated internal door latch 169
39. Mains box heat monitor 170
40. Digital stop watch 171
41. Flashing cum running light 172
42. Faulty car indicator alarm 172
43. Quality FM transmitter 173
44. Simple key opertated gate locking system 174
45. DC motor control using a single switch 175
46. Handy tester 176
47. Programmable electronic dice 177
48. PC based candle ignitor 177
49. Solidstate remote control switch 178
50. Microcontroller based monitoring system 179
51. Automatic school bell 181
52. Automatic water pump controller 183
53. Noise meter 184
54. Anti theft alarm for bikes 185
55. Timer with musical alarm 186
56. Mains failure/resumption alarm 187
57. Soldering iron temperature controller 187
58. Multipurpose white led light 188
59. Electronic watchdog 189
60. Fire alarm using thermistor 190
61. Twilight lamp blinker 191
62. Electronic street light switch 192
63. Water level controller 192
64. Sound-operated intruder alarm 193
65. Hit switch 194
66. Chanting player 195
Brand: Kits'n'spares, Marketed by: Kits'n'spares
