Search This Blog

Powered by Blogger.

Translate

Rain Detector Circuit

This circuit uses a sensor made of a small piece of etched PC board and a simple SCR circuit to detect rain and sound a buzzer. The SCR could also be used to activate a relay, turn on a lamp, or send a signal to a security system.


This is the schematic of the Rain Detector








Part


Total Qty.


Description


Substitutions
R1
1
1K 1/4 W Resistor
R2
1
680 Ohm 1/4 W Resistor
D1
1
1N4001 Silicon Diode
BZ1
1
12V Buzzer
S1
1
SPST Switch
SCR1
1
C106B1 SCR
106CY
SENSOR
1
See Notes
MISC
1
Board, Wire, Case, PC Board (For Sensor)

NOTE:
  1. The sensor is a small piece of PC board etched to the pattern showen in the schematic. The traces should be very close to each other, but never touching. A large spiral pattern would also work.
  2. Make sure to use a loud buzzer.

7 Segment LED Counter

This simple counter can be used to count pulses, as the basis for a customer counter (like you see at the doors of some stores), or for anything else that may be counted. The circuit accepts any TTL compatible logic signal, and can be expanded easily.





R1-R7----470 Ohm 1/4 Watt Resistor
U1------- 74HC90
U2------- 74HC47
Disp---- 7 Seg Common Anode


NOTE:

  1. All pulses to be counted are to be TTL compatible. They should not exeed 5V and not fall below ground.
  2. You can add more digits by building a second (or third, or fourth, etc...) circuit and connecting the pin 11-6 junction of the 74LS90 and 74LS47 to pin 14 of the 74LS90 in the other circuit. You can keep expanding this way to as many digits as you want.

Page Rank

google pagerank

Write For Us

Submit a Guest Post

Find us on Facebook

Categories

555 Timer IC 7 segment Display 8051 Project AC Circuits Adafruit Alarms Amplifier Circuits Analog Circuits android Arduino arm processor Assembly Languange Atmel Atom Size Audio Circuits augmented reality Automotive Circuits avr Battery Circuits Bicycle Gurad bluetooth Cable TV Circuits Cambridge University Camera Technology Circuit Boards Clipping And Clamping Circuits Clocking And Timer Circuits Computing contact lens Contact Us Form Contests Controller Circuit Conversion Circuits Counter Circuits Digital Electronics diy circuits Downloads EFY EFYTimes Electronic Books Electronic Components Electronic Locks And Keys Engineering Fan Circuits Filter Circuits Fire Alarm free Frequency Fun And Game Circuits future Google Hack n Mod Ham Radio Circuits heart rate monitoring High Voltage Circuits Home Circuits IC Guide ieee Industrial Circuits Infrared Instructables Inventions ipad lcd Led Circuits Light Related Lighting Circuits Medical Circuits Meter Clocks Microcontrollers Microprocessors Mini Projects modules Movie maker NatGeo Navigation Notice Optical Fiber PC Circuits PCB Boards Physics pnp transistor Power Supplies Printing Projects Programmer Project Ideas Projectors Protection circuits Proximity Detectors Radar Radio Circuits Radio Transmitters Raspberry Raspberry Pie Remote Circuits Retis Lab RFID Robot Cars Robotics Science Science Alert Security And Safety Sensor Circuits Servo Motors Smallest Smartwatches sms Software solar cell sound application Spectram Switch Technology News Telephone Related Television Related Test And Measurement Circuits Thermal Projects Tone generator circuits Touch Screen Tutorials Wearables Wi-Fi Wireless
Like us on Facebook
Follow us on Twitter
Recommend us on Google Plus
Subscribe me on RSS