• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar

Homemade Circuit Projects

Get free circuit help 24/7

  • 1000+ Circuits
  • Privacy Policy
  • About Us
  • Contact
  • Disclaimer
  • Videos – Circuit Test Results
You are here: Home / 555 IC Circuits / Car Radiator Hot Indicator Circuit

Car Radiator Hot Indicator Circuit

Last Updated on July 6, 2019 by Swagatam 2 Comments

The proposed circuit is very useful which warns the car driver before hand once the radiator gets heated up above the preset level.

How it Works

The working of this circuit is very simple and works off on the car battery. The familiar IC555 is used here which is the heart of the circuit. The thermistor used here triggers the pin2 of the IC and it in turn makes its output high and it gives a buzzer indication when the temperature goes above the preset level.

The variable resistors should be suitably adjusted so that the buzzer rings at a certain temperature by using variable power supply of 12v.

How to Set up the Circuit

You may use a candle to set the circuit. BUT REMEMBER NOT TO PUT THE THERMISTOR TOO CLOSE TO CANDLE OR ELSE THE THERMISTOR DAMAGES. And after setting the circuit, clean the thermistor to remove soot deposits.

The setting of the circuit is now complete. You may keep the entire circuit in a plastic casing with hole for power supply and the sensor.

Keep the sensor (thermistor) near the car radiator and the circuit inside the car. If you feel difficult to use the key switch, you may include a small switch and connect the circuit directly to battery. But you should switch it on every time manually.

Circuit Diagram

Parts List 

  • R1-5k variable resistor,
  • R2-NTC thermistor, 50k,
  • R3-5k variable resistor,
  • R5-470ohms,
  • LED1-green,
  • LED2-red,
  • C1-10nf.

Written and Submitted by: ss kopparthy




Previous: How to Make Adjustable Current Limiter Circuits
Next: Simple Shop Shutter Guard Circuit to Safeguard your Shop from Theft

About Swagatam

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials.
If you have any circuit related query, you may interact through comments, I'll be most happy to help!

You'll also like:

  • 1.  PWM LED Light Intensity Controller Circuit
  • 2.  Automatic Light Sensitive Switch with Adjustable Dawn or Dusk Switching
  • 3.  Lamp Outage Detector Circuit for Car Turn Signal
  • 4.  Make this Temperature Indicator Circuit with Sequential LED Display
  • 5.  Simple Electronic Fuse Circuit
  • 6.  How to Build a Rain Sensor Circuit

Please Subscribe (Only if you are Genuinely Interested in our Newsletters)


 

Reader Interactions

Comments

    Your Comments are too Valuable! But please see that they are related to the above article, and are not off-topic! Cancel reply

    Your email address will not be published. Required fields are marked *

  1. Search Related Posts for Commenting

  2. Luke says

    Nice

    Reply
  3. dharmaVidhyan dharmi says

    While this simple design is good enough for basic temperature detection, it will give poor result in automotive environment.

    Reply


  4. COMMENT BOX IS MOVED AT THE TOP


Primary Sidebar

Electronic Projects Categories

  • 3-Phase Power (15)
  • 324 IC Circuits (19)
  • 4017 IC Circuits (51)
  • 4060 IC Circuits (25)
  • 555 IC Circuits (92)
  • 741 IC Circuits (18)
  • Amplifiers (49)
  • Arduino Engineering Projects (82)
  • Audio Projects (84)
  • Battery Chargers (75)
  • Car and Motorcycle (87)
  • Datasheets (45)
  • Decorative Lighting (Diwali, Christmas) (31)
  • DIY LED Projects (81)
  • Electronic Components (97)
  • Electronic Devices and Circuit Theory (35)
  • Electronics Tutorial (99)
  • Fish Aquarium (5)
  • Free Energy (34)
  • Games (2)
  • GSM Projects (9)
  • Health Related (17)
  • Heater Controllers (23)
  • Home Electrical Circuits (98)
  • Incubator Related (6)
  • Industrial Electronics (26)
  • Infrared (IR) (39)
  • Inverter Circuits (94)
  • Laser Projects (10)
  • LM317/LM338 (21)
  • LM3915 IC (24)
  • Meters and Testers (54)
  • Mini Projects (153)
  • Motor Controller (64)
  • MPPT (7)
  • Oscillator Circuits (12)
  • PIR (Passive Infrared) (8)
  • Power Electronics (33)
  • Power Supply Circuits (66)
  • Radio Circuits (9)
  • Remote Control (46)
  • Security and Alarm (56)
  • Sensors and Detectors (115)
  • SG3525 IC (5)
  • Simple Circuits (72)
  • SMPS (30)
  • Solar Controllers (60)
  • Timer and Delay Relay (51)
  • TL494 IC (5)
  • Transformerless Power Supply (8)
  • Transmitter Circuits (38)
  • Ultrasonic Projects (12)
  • Water Level Controller (45)

Follow Homemade Circuits

Facebook
Twitter
YouTube
Instagram
My Facebook-Page
Quora

Feeds

Post RSS
Comment RSS

Circuit Calculators

  • AWG to Millimeter Converter
  • Battery Back up Time Calculator
  • Capacitance Reactance Calculator
  • IC 555 Astable Calculator
  • IC 555 Monostable Calculator
  • Inductance Calculator
  • LC Resonance Calculator
  • LM317, LM338, LM396 Calculator
  • Ohm’s Law Calculator
  • Phase Angle Phase Shift Calculator
  • Power Factor (PF) Calculator
  • Reactance Calculator
  • Small Signal Transistor(BJT) and Diode Quick Datasheet
  • Transistor Astable Calculator
  • Transistor base Resistor Calculator
  • Voltage Divider Calculator
  • Wire Current Calculator
  • Zener Diode Calculator

© 2021 · Swagatam Innovations