Temperature Compensated Arduino TDS Meter

author prototype of temperature compensated arduino tds meter

In this article, you will learn about the effect of temperature on the TDS of water and finally, you will learn how to make a “Temperature Compensated Arduino TDS Meter”. TDS (Total Dissolved Solids) is the sum of organic and inorganic substances dissolved in water and, the methods used for the measurement of TDS value are Gravimetric Analysis and the Measurement of Electric Conductivity (EC). The gravimetric analysis provides reliable TDS value but it is time-consuming and is not very applicable when analyzing a lot of samples. So the measurement…

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TDS Sensor and Arduino Interfacing

Author Prototype of TDS Sensor and Arduino Interfacing

In this article, you will learn about TDS Sensor and Arduino Interfacing. TDS stands for Total Dissolved Solids and represents the amount of total dissolved solids (organic and inorganic substances) in water. TDS value is related to water quality. Typically, the higher the TDS value, the poorer the water quality. Pure water has a TDS value of 0, and the TDS value increases for increasing dissolved solids. But do remember that measuring the TDS value doesn’t provide you with the information on whether the dissolved solids are healthy for the…

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Interfacing Temperature and Humidity Sensor TH02 with Arduino

author prototype pf th02 interfacing with arduino

TH02 is a consumer-grade digital temperature and humidity sensor. Although it can operate with a humidity range of 0-100% RH, it provides reliable or highly accurate data when the environmental conditions are between 0-70°C and 0-80% RH. The reason to use the TH02 sensor is that it provides a reliable reading in most home and daily applications if operated at its measuring range. It comes with its output calibrated in standard I2C format. In this article “Interfacing Temperature and Humidity Sensor TH02 with Arduino”, you will learn how to interface…

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Interfacing AHT20 with Arduino

author prototype of Interfacing AHT20 with Arduino

AHT20 is a temperature and humidity sensor that utilizes a MEMS semiconductor capacitive humidity sensor and a standard on-chip temperature sensor. It has better performance and is more stable in harsh environments compared to DHT11, DHT22 which are commonly used temperature and humidity sensors. It has an astounding humidity measuring range of 0-100% RH with humidity accuracy as low as ±2% at 25℃. It comes in an SMD package and its output is calibrated in standard I2C format. In the article “Interfacing AHT20 with Arduino”, you will learn how to…

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10A Laboratory Power Supply Circuit

10A laboratory power supply circuit

A good high-power laboratory power supply must-have device for electronic enthusiasm. As being electronic enthusiastic we all love to design our own bench power supply. So here in this article, you will learn to design your own variable current and voltage 10A laboratory power supply circuit. Features of 10A Laboratory Power Supply Circuit: Users can select voltage and current as per the requirement Constant current mode Short circuit indication and protection Voltmeter and ammeter Fuse for extra protection Applications It can be used as a general variable power supply. It…

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Microphone Preamplifier and Noise Limiter

Microphone Preamplifier and Noise Limiter

The circuit posted here is of a microphone preamplifier and noise limiter. The main role of a microphone preamplifier circuit is to raise the signal level of the microphone output signal. A microphone is a transducer that converts sound signals to electrical signals. The output signal of the microphone is very small in a range of a few millivolts. This signal needs some level of amplification before the power amplification. Generally, the gain of the preamplifier is set to between 30 to 100. Besides pre-amplification, the circuit also limits noise.…

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40 Channel Citizen Band Transceiver

40 Channel Citizen Band Transceiver

The availability of low-cost PLL and programmable divider ICs has led to the use of synthesizers in virtually all channelized transceivers. This is true even for the very low-cost systems used on the 40-channel citizen band transceiver. The circuit of the 40 Channel Citizen Band Transceiver is shown in Fig. 1 allows all necessary frequencies for a CB transceiver to be generated by using a single-crystal oscillator. The 40 channels are spaced at 10-kHz intervals (with some gaps) between 26.965 and 27.405 MHz. Local oscillator frequencies for the reception of…

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Simple White Noise Generator Circuit

Simple White Noise Generator Circuit

A signal which contains almost all frequencies is called white noise. In an audio system white noise contains only audible frequency. The white noise of the electrical system is analogous to white light from optics, where white light contains all frequencies or colors. White noise is mostly used in the testing audio equipment like pre-amplifier, power amplifiers, filters, etc. Check out the article on Electrical noise | Types of Electrical Noise. So, today in this article we are going to describe a simple white noise generator circuit. This circuit can…

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How to Arduino Thermocouple Interface

author prototype of arduino thermocouple interface

How to Arduino Thermocouple Interface: In this article, you will learn about interfacing K-type thermocouples and display temperature in Celsius and Fahrenheit on I2C LCD. Introduction of Thermocouple A thermocouple consists of a pair of dissimilar metal wires joined together at one end, called a sensing junction, and terminated at the other end, called the reference junction which is maintained at a known constant temperature called the reference temperature. When the sensing junction and the reference junction are at different temperatures, a potential difference gets produced which causes a current…

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Lithium Ion Battery Charger Circuit using LM317

author prototype of Lithium Ion Battery Charger Circuit

Lithium-Ion Battery Charger Circuit using LM317 charges the battery in two different modes i.e. constant current mode and constant voltage mode. Lithium polymer or lithium-ion batteries are very much prone to overcharge or charging with high voltage or high current. Thus, when designing the charger circuit for Li-ion or Li-Po we have to consider a few things like charging voltage and/or charging current. The circuit posted here is designed using one of the famous variable voltage regulators IC LM317. This circuit charges the battery in two modes i.e. constant current…

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