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Meter Counter Circuits
fahrenheit thermometer circuit
This is a design for thermometer. This is a simple circuit design. This circuit is based on temperature sensor using LM35 Ic. If you have a digital voltmeter, or any voltmeter with millivolt resolution and high input impedance, then you can use this temperature-to-voltage adapter circuit to measure room temperature. This is the figure of the circu
thermometer circuit using lm335
This circuit in below is show the simple form of the thermometer circuit. The circuit is based on LM335 as sensing the temperature. This is the figure of the circuit. The circuit consists of two parts: The LM335 and its adjustment. The output of the LM335 is 10 millivolts per degree C, with 25 degrees C corresponding to 2. 982 VDC. A reference circ
linearizing circuit for thermocouples
This circuit changes the gain of opamp U1B in four steps or segments. It can be used to get a linear output from most transducers to 1% levels. U1A is a amplifying buffer use it to boost the signal to the required level. The resistor values i have put are for an imaginary transducer, you have to design them. The buffered input signal is compared to
simple thermocouple amplifier
The OP07 is in a non inverting amplifier so as not load the mV of thermocouple, the zeners are to protect circuit if junction contacts heaters or the earth gets broken. The RC is to filter out 50Hz pick up in thermocouple wires if near heater wiring and also reduces reading jumps when high current three phase contacter operates. The Pull-up 10M is
With the easy availability of inexpensive digital multimeters, and integrated circuit temperature sensors, it is now very easy to build a sensitive and accurate digital thermometer that can be used for many experiments around the house or in the amateur laboratory. There are two tenperature sensors that make this particulary easy - the LM34 and t
lcd thermometer circuit with lm35
The LM35 of National Semiconductors that is used in this project is a precision centigrade temperature sensor, which has an analog output voltage. It has a range of -55 C to +150 C and an accuracy of ±0. 5 C. The output voltage is 10mV/ C. The output voltage is converted by the AD convertor of the AT Mega8. The temperature is displayed on an
arduino LCD thermometer
A temperature sensor (MCP9700 linear active thermistor IC) and LCD are connected to the Arduino in this tutorial. The Arduino reads the temperature from the MCP9700 on analog pin A0 and displays the temperature on the LCD..
arduino serial thermometer
The Arduino reads temperature from a MCP9700 temperature sensor IC and displays the temperature in the Arduino IDE serial monitor window..
Digital thermometer circuit
Connecting Infrared Thermometer MLX90614
MLX90614 is a very useful infrared thermometer (no contact needed) that gives you the average temperature reading of all objects in the view range. In addition to it`s principal temperature reading function, it can be used for movement or even presence detection. There are two ways of interfacing this sensor, through PWM communication or SMBus...
thermometer based on mikrokontroler
This is a circuit of a microcontroller AT89S52 thermometer and LTC1298 12-bit ADC, programs written in C language program with digital filtering and interface the LED display. Reading provides a sensitivity 0. 1C. The hardware block and circuit diagram is shown in the figure below. The thermistor sensor is epoxy. The signal conditioning circuit is
digital room thermometer using lm35 sensor 8051 microcontroller
Interface the LCD with 8051 microcontroller at89s52. But whenever I power up the microcontroller, LCD is lit but only black boxes are showing. I have tried many different codes and many things, but display is same. onle black boxes. But i have simulated this circuit in proteus. here, that LCD is giving correct output. Plz help in determining the...
using thermopile sensor in ir digital thermometers
Because of their speed, accuracy, effectiveness, and cost, infrared (IR) digital thermometers have replaced traditional mercury thermometers. Using a thermopile sensor, an ear digital thermometer measures the infrared heat of the eardrum, which reflects the temperature of the hypothalamus..
w201 thermometer question
My `89 2.6 outside thermometer (Celsius) has blacked out and I was lucky by finding a good e-bayer who has one.. I bought it but appartently it was..
hand held digital thermometer
Hand held digital thermometer : How to Make a hand held digital themometer with range from -50Deg C to 1100Deg C..
thermostat for 1kw space heater scr controlled
The heater element (not shown) is connected in series with two back to back 16 amp SCRs (not shown) which are controlled with a small pulse transformer. The pulse transformer has 3 identical windings, two of which are used to supply trigger pulses to the SCRs, and the third winding is connected to a PNP transistor pair that alternately supply...
electronic thermostat and relay circuit
Here is a simple thermostat circuit that can be used to control a relay and supply power to a small space heater through the relay contacts. The relay contacts should be rated above the current requirements for the heater..
digital remote thermometer
This circuit is intended for precision centigrade temperature measurement, with a transmitter section converting to frequency the sensor`s output voltage, which is proportional to the measured temperature. The output frequency bursts are conveyed into the mains supply cables. The receiver section counts the bursts coming from mains supply and...
Digital thermometer circuit based on CA3162 CA3162 and LM35
A simple digital thermometer circuit with out a micro controller and having a seven segment LED read out is shown here. The circuit is based on three ICs: CA3162, CA3161 and LM35. CA3162 is a monolithic analogue to digital (A/D) converter that has BCD output. The A/D converter inside the IC is a dual slope type with differential inputs. The IC has
LED Thermometer-Temperature Measurement Circuit using LM 34 IC
An LED Thermometer which can be used as a temperature sensor or temperature measurement circuit built using LM 34 -a Fahrenheit display or LM 35-degree Celsius display of temperature..
Digital Remote Thermometers
This circuit is intended for precision centigrade temperature measurement, with a transmitter section converting to frequency the sensor`s output voltage proportional to the measured temperature. The output frequency bursts are conveyed into the mains supply cables. The receiver section counts the bursts coming from mains supply and shows the...
CVS Oral Thermometer Dissection
This very simple high-level design demonstrates the product`s structure. Its integrated circuit responds to button presses and senses temperature via the probe, displaying the temperature on the LCD and sounding the buzzer when finished. This more detailed diagram shows that the temperature probe is part of a temperature measurement circuit. There
Simple Portable Thermometer
It is very easy to use and consumes so little current that it will work for the battery`s shelf life. The circuit uses a standard LM35DZ sensor (IC3) whose analogue output voltage is buffered by an LM358 (IC2A). The voltage is read by the microcontroller and converted into a BCD value so it can appear on the multiplexed 7-segment displays. The...
Can someone help me find a schematic and codes about a digital thermometer using a LM35 and 7 segment display(0 - 150.5 degree celcius)..the code must ..
Digital Thermometer using ATmegsa8 and LM335
hello , I am planningto build Digital Thermometer using ATmegsa8 and LM335. Can Somebody tell me how should i go about ?? I want to display it on..
Energy harvesting from thermoelectric sources
The cost of electricity around the world has steadily been rising for over the past 40 years. With the exception of a few periods of flat rates and a handful of minor downwards, the cost of electricity has risen almost every year since 1970. There are a number of factors which have contributed to this trend including a growing population and the e
The circuit of the Celsius thermometer in the diagram is based on the well-known Type LM334 from National Semiconductor. This IC is a sensor that provides..
Digital Remote Thermometer
Remote sensor sends data via mains supply, Temperature range: 00.0 to 99.9 °C This circuit is intended for precision centigrade temperature measurement, w..
8 channel thermocouple based temperature data logger
You need to wire 8 Max6675 ics to a microcontroller. You can parallel all the clock inputs. The NCS lines of numbers 1 and 2, 3 and 4 etc can be connected together. The SO lines of all the odd numbered Max6675 can be connected together, as can the even ones. That way you can read 8 temperatures on 7 wires (1 clock, 2 data and 4 not chip select)...
ICL7106 electronic thermometer circuit design project
The ICL7106 Integrated circuit contain all the active circuitry for a 3 1/2 digit panel meter (DPM) in a single chip. It was designed to interface directly to a liquid crystal display (LCD). The potential difference across a silicon diode is dependent on its temperature and current through it. Its temperature coefficient is negative, that is, the
Thermometer circuit schematic using operational amplifiers
A simple thermometer built with operational amplifiers and a normal or protective diode such as 1N4148, instead of the temperature sensor can be made using electronic diagram below. A constant reference voltage is applied to the noninverting input of operational amplifier. Current passing through the diode, is also maintained at a constant level.
Frequency Meter Circuits
VU Meter Circuits
Ultrasonic distance finder circuit
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is measured. There are three main categories of distance measurement methods in use: a) By...
Simple Metal detector circuit with CD4030
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to find something potentially valuable, hidden a few centimeters below the soil. So many...
Fully automatic watering circuit for flower pots
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This circuit comes as a solution to this problem. Depending on humidity of the pot at...
Simple deep searching metal detector circuit
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the circuit of this metal detector, it is possible to detect a metal coin in depth of 90 to...
Sub-Harmonic Bass Converter for Electric Guitars
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound, such as filtering or distortion. Instead, a frequency division system produces outputs...
Echo Depth Sounding Sonar for Boats
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the calibration of the rope. This arrangement still exists in some yachts. The big...
100W HiFi Audio Amplifier Circuit
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power supply must be symmetrical so that no electrolytic capacitors are needed at the outlet....
Plant-Pot Water Level Indicator Circuit
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower. The circuit of the device is shown in Figure 2. The water detection is made from the bottom...
Analogue Sound Preasure dB-Meter Circuit
The best human ear can capture sounds from 20Hz to 20KHz. These limits are known to be the broadest that can exist. Normally the normal limits range from 100Hz to about 13KHz and depend on the age and health of the individual. We for our measurements and to have a good accuracy we will get the limits of 20Hz to 20KHz. A sound to be heard does...
Digital Signal Integrity
Interconnection and Timing of Digital Circuits
CMOS Circuits Tutorial