Arduino tesla meter



If you are search for Arduino Drag Race Timer, simply check out our article below : Arduino Timer Drag Race . Adjusting. Write a comment. The sketch is the software that runs on the Arduino. The project has a 0. Arduino library to get data from energy meters in order to monitor them. 1pH (25 ℃). To calibrate the wattmeter, a reliable multimeter and a stable adjustable power supply is needed. #11. Circuit diagram of the DC panel meter using Arduino is shown in Fig. Tap to zoom. $60 is a lot when the goal is to make it cheaper. I have experimented the project for very small rated (10Watt) solar system but The meter will now measure with a basic tolerance of ±10 %. 95. Free shipping This meter is equipped with an optical infrared interface and a RS485 interface to distribute the collected data via the so called SML protocol. 9 out of 5 stars 5 $101. First, connect 5V power supply from Arduino board to Serial-RS485 Converter and meter. /* ElCheapo Arduino EC-PPM measurments This scrip uses a common USA two prong plug and a 47Kohm Resistor to measure the EC/PPM of a Aquaponics/Hydroponics Sytem. Search: Arduino Drag Race Timer. Hall effect sensors are used for  Rather consider using watt hours or more commonly amp hours for small DC circuits. 511,916). Cheap Integrated Circuits, Buy Quality Electronic Components & Supplies Directly from China Suppliers:RTC real time clock module DS3231SN ChronoDot V2. The signal to be measured is given to connector CON1. 11b connection through the home [s wireless router to the base station and Matlab interface. Gravity: Analog Electrical Conductivity Sensor / Meter For Arduino — Arduino Online Shop. This library is used to monitor energy meters. FW Bell 4180 Triple-axis Gaussmeter, Teslameter, AC Magnetic Field EMF meter. Portable gauss meter is a 9V battery power supply , can be used continuously for 20 hours. Cheap Integrated Circuits, Buy Quality Electronic Components & Supplies Directly from China Suppliers:NRF24L01 Wireless Module Board 8 Pin Receiver Transmitter Microcontroller 2. 2 is the easiest point of entry to basic IoT with the standard form factor of the UNO family. 7 12V 14500 Battery Holder Enjoy Free Shipping Worldwide! Limited Time Sale Easy Return. Joostan December 8, 2014, 8:26pm #1. It uses callbacks to trigger actions each time the meter measures a certain amount of kilowatts-hour. Tesla BMS and Arduino failing to communicate! This is an Arduino Due with ESP32 ARM board connected toArduino Bms 9 Calibration And Initial Testing. h> // Include Emon Library #include <SoftwareSerial. Physics Education, 51(2), 1-1. 3v it will not work, since the optocouplers will not be activated with 3. Gravity: Analog Electrical Conductivity Sensor / Meter For Arduino. $69. The outputs A and B of MX485 are connected to A and B of the power meter, respectively. 5 - 12V), or USB input power. Each Arduino capacitance meter relies on a property of resistor capacitor (RC) circuits- the time constant. • 8 vertical Hall sensors – the in-plane  The project used an Arduino to take measurements from six sensors to measure the strength of a nearby electromagnet that generated 10 teslas. 2017 Rubber Ducky no es más que un microcontrolador (AT32UC3B1256) similar al que podemos encontrar en algunas placas Arduino como son la Leonardo,  3 oct. The Arduino based wireless power meter is a non-invasive current meter for household power with a Matlab interface. Tesla has told me they are working on new firmware to pair with a Neurio w-2 meter that they will come install in the next few week (aka months). Step 2: The Meters. View datasheets, stock and pricing, or find other Sensor Development Boards and Kits. Inventor, James M. Elon Musk: Tesla, SpaceX, and the Quest for a Fantastic Future. The circuit is extremely simple, comprising the  Teslameter/Gaussmeter with Arduino & hall-sensor CYSJ362A for B = 0-3 Tesla. The Arduino converts the raw data from its analog input into human readable values, then sends them to the serial port monitor. With a gauss meter you can measure a magnetic field. AMTAST TES11A Tesla Tester Digital Gauss Meter Surface Magnetic Field Meters Metal Probe Guassmeter with Ns Function 4. This tesla coil drive circuit is controlled by tesla bobini according to a slightly different sound signal. This project shows a simple, sensitive and reliable meter with a North-South Pole display. Tachometers read out revolutions per minute (RPM), which tells the  Gauss Meter / Tesla Meter. 00 30% OFF | Buy DSTIKE WiFi Deauther Watch V3 ESP8266 Development Board | Smart Watch DevKit | Arduino NodeMCU ESP32 IoT 800mA From Vendor KaisayaHIFI Audio Store. 4,254 views4. DO – 3. The 5V supply is used for the Arduino and the 3. 2% of its voltage when fully charged: dB is a relative measurement, so you need a reference. szmeu April 17, 2021, 11:10pm #1. Whether you are looking at building a sensor network connected to your office or home router, or if you want to create a BLE device sending data to a cellphone, the Arduino UNO W Arduino Emf Meter. Arduino-BMS. Read about company. 96″ OLED display, Atmega328 Microcontroller, 3. $7. 3v. It is based on a precision current sink and a high-resolution ADC controlled by an Arduino Nano V3. Cool project. Secret Arduino Voltmeter – Measure Battery Voltage - A little known feature of Arduinos and many other AVR chips is the ability to measure the internal 1. A gauss meter displays electromagnetic wave measurements in Gauss (G), milliGauss (mG), milliTesla (mT) or microTesla (µT) units. #include <EmonLib. Instead of checking it manually Circuit of sinusoidal frequency meter using arduino shown in figure 1. In the case of connecting the meter to an Arduino board, no problem will work correctly, in case of connecting with an ESP8266 module at 3. INTRODUCTION The unit of the magnetic flux is the tesla meter squared. 02/piece. For most hobbyist this great accuracy range and it's low cost makes this a grea BST series of handheld digital Gauss / Tesla meter can be used to measure the DC magnetic flux density , magnetic field and other types of AC magnetic field ; Portable Gauss Meter can carry a wide range , easy to operate, digital LCD display clearly . Flow measurement applications are very diverse and each situation has its own The Arduino based wireless power meter is a non-invasive current meter for household power with a Matlab interface. This data is then transmitted over a 802. Meter labels can be changed easily. Construction of a Simple Low-Cost Teslameter and Its Use with Arduino and MakerPlot Software. To remotely monitor water flowing through my home’s meter (top), I attached a magnetometer and used an Arduino to read and process the raw data. tesla March 22, 2017 At 2:14 pm. The time constant of an RC circuit is defined as the time it takes for the voltage across the capacitor to reach 63. W, Keyes Hall/Holzer Effect Sensor Module KY-024 49E 5118G Arduino Pi Flux Workshop. WS2812 VU meter. W. Step 3: Upload the Arduino Sketch. What it is for. 90. 2016 Construction of a simple low-cost teslameter and its use with arduino and MakerPlot software. Type: Digital Tesla Meter Gauss Meter Gaussmeter, Minimum resolution: 10uT 5V 12V 1-2-4-8-16 Channel Relay Module Arduino Raspberry PI ARM AVR DSP PIC  Bell 5070 Gaussmeter With Probe And Case Tesla Meter Magnetometer F. PH Probe Sensor Pinout. Robitaille, and the Fix The World Council have released an energy generator, inspired by Tesla’s 1894 “Electric Generator” (Patent No. This is a dissolved oxygen sensor kit, which is compatible with Arduino microcontrollers. Let’s build a simple pH-meter, all we need are Arduino (Uno/Nano/Whatever), PH-4502C and BNC probe. For most hobbyist this great accuracy range and it's low cost makes this a grea There's a few things to point out: The power supply unit can take an unregulated input voltage (6. TX (arduino pin 0) connected to driver input MX485, RX (arduino pin 1) connected to receiver output MX485. Arduino Musical Tesla Coil May 06, 2021 · About opto-isolator and mosfet high TL494 IR2110 IGBT Tesla coil control doing a kind of tesla vu-meter or  An Arduino magnetic sensor can have several uses: for reading the speed of a you will see the how different magnet types give different tesla values. socbrian said: I just want to inform people, I have been held up from registering my system with New Jersey's TREC program due to the Telsa inverter not being RGM capable. Posted in Arduino Hacks Tagged 12 volt, arduino, inverter, power inverter Giving An RC Tank A Fire Control Computer June 11, 2013 by Brian Benchoff 29 Comments Arduino-BMS. 13 oct. The project is Open Source and aimed for hackers, musicians and programmers that want to learn about DSP (digital signal processing), LEDs, guitar effects Aug 12, 2021. Oct 13, 2018. The "120/240 Volt Pass-Through kWh Meter" is $90, and $60 if you buy 100+, and it has a pulse communication system that would work with Arduino to take their value. 10 x LEDs (5 green, 3 yellow, 2 red) Color doesn’t matter so much, but it looks more awesome with different colors. Instant connection to your probe your Arduino to get pH measurements at ± 0. Arduino Timer Drag Race . If the answer is no,  Además de esta unidad Gauss (G), está la unidad Tesla (T). IoT based smart meter Does Proteus, Arduino UNO, and Arduino IDE are the only software to do this IOT based simulation circuit? 2. 0 sensor interface. Professional pH Sensor Meter Kit with industrial electrode. 3V is used for the ESP8266. It is widely applied in many water quality applications, such as aquaculture, environment monitoring, natural science, etc. VCC – 5V DC. This Arduino compatible hardware can be program using Arduino IDE. Arduino Team — September 18th, 2017. 99 $ 101 . Gnd – Gnd for board. code. 50pk  New WeMos D1R2 Analog WiFi D1 R2 ESP8266 + 32 Mb Flash For Arduino Uno R3 Bell 10x Axial SAK8-1802 Gaussmeter Tesla Meter Magnetometer Probe F. Gnd – Gnd for PH probe. Sensing part composed of two types of micro-Hall sensors. 7 jul. I. Share. TO – Temperature output. Analog pH Sensor / Meter Kit specially designed for Arduino controllers and has convenient and practical "Gravity" connector and a bunch of features. This is an analog-style VU meter on a 0. The m  gravity-analog-tds-sensor-meter-arduino-schematic - View presentation slides online. The timer circuit generates a square wave which will be provided to UNO for testing. Cheap Integrated Circuits, Buy Quality Electronic Components & Supplies Directly from China Suppliers:2PCS Ra 02 LoRa Radio Node V2. Using Arduino LEDs and Multiplexing. 2018 Arduino tachometer used to calculate the rotational motion of a part. Arduino Milliohm Meter. In this tutorial we are designing flow meter using arduino, basically we use arduino boot loader controller on our custom made PCB. Like all Tesla Coils, a Solid State Tesla Coil (SSTC) is a type of high frequency resonant transformer which can step up a low voltage DC input into a very high frequency AC output. As this make sensors a hands on primer for monitoring the real world with arduino and raspberry pi, it ends occurring being one of the favored ebook make sensors a hands on primer for monitoring the real world with arduino and raspberry pi collections that we have. 1mOhm. This brought the idea of designing an ENERGY METER. Shipped with USPS First Class. Current is measured using split core current transformers. Code: TPX00041 / Barcode: 6959420902538. Abstract This report is about building a magnetic field meter or gaussmeter. The main difference between a SSTC vs a SGTC is that the SSTC has no spark gap an instead uses modern transistor technology to switch the current in the primary coil. This is my code: How to make diy light lux meter using arduino and bh1750 ambient light sensor by Light Lux Meter; Published on January 18, 2021. Presented here is a DC Panel Meter circuit to display DC voltage and current of power supplies, including DIY-type ones. For those who are new to this topic and wish to build this simple esr-meter I warmly recommend to read all the four pages because from the first post that I made, there were some significant changes that will improve the esr-meter The Arduino UNO WiFi Rev. PO – PH analog output. 0 433MHz SX1278 Wireless Module IPEX interface for Arduino ATmega328P 3. Cheap Electronics Stocks, Buy Quality Electronic Components & Supplies Directly from China Suppliers:Acoustic Sensor sound detector Chip LM393 microphone module for Arduino Enjoy Free Shipping Worldwide! Limited Time Sale Easy Return. To test the Frequency Meter, we are going to make a dummy signal generator. I used ARDUINO as the heart of this project because it is very easy to write code in its IDE and there are huge numbers of open source library available in the internet which can be used according to the requirement. Tesla Electronics - Offering Arduino Pro Mini, Arduino UNO Board, अर्दुइनो बोर्ड at Rs 260/piece in Udupi, Karnataka. A gauss meter can detect either static (DC) permanent (rare-earth) magnetic or dynamic (AC) electromagnetic fields (EMFs), or both. If you are search for Arduino Drag Race Timer, simply will check out our links below : Cheap Integrated Circuits, Buy Quality Electronic Components & Supplies Directly from China Suppliers:2PCS Ra 02 LoRa Radio Node V2. 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For the development of the construction and design of the Tesla turbine was a digital control system programmed in arduino, sensed by a flow meter of  Hall Effect - A Hall effect sensor is a transducer that varies its output voltage in response to a magnetic field. Tesla meters are expensive (ranging from $70 on ebay to $500 for this is (almost) the same IC used by Arduino for the Zero and Adafruit for the  You can use Arduino for this job, but is better use a microcontroller called Attiny85. POT 1 – Analog reading offset (Nearest to BNC connector) POT 2 – PH Daniel’s version of the meter is based on a precision current sink and a high-resolution ADC controlled by an Arduino Nano. Click to expand. The actual new digital reading is shown in the bottom left corner of the meter. 3V pH limit trigger. The design is very simple, the whole assembly can be built in a couple of hours once all the parts are gathered. 17 ene. CT Sensors - Interfacing with an Arduino; Assemble the components per the diagram above. It is designed around arduino board, bridge rectifier, 16×2 LCD, 4N35 optocoupler and few resistors as shown in circuit diagram. After discussing how their grandfather used to monitor well levels outside of a summer cottage in order to avoid emptying it, Instructables user “karlli” and his brother decided to take on this task themselves. It has an LED which works as the Power Indicator, a BNC connector and PH2. In this case, thanks to the divider circuit, we can send the voltage to the analog input of Arduino after reducing the voltage below 5 volts. 10 x 200-220Ω resistors. Instant connection to your probe an your Arduino to get pH measurements at ± 0. // this code is uploaded to arduino. Tesla Meter Gauss Meter AC DC Magnetic Field Flux Meter 2000mT Gaussmeter. logo Publicado por Oscar Gonzalez . Holley DZ541. Arduino UNO project, Power Quality Meter, someone would call it’s PQ Monitor or PQ Analyzer. 0 I2C for Arduino Memory DS3231 module Enjoy Free Shipping Worldwide! Limited Time Sale Easy Return. h> //This library will do serial communication b/w arduino and nodemcu. As this is a very large unit, workers in the earth sciences commonly use the nanotesla (nT) as their working unit of measure. I opted not to use a an I2C 16x2 LCD display, because there were enough I/O pins available on the Arduino to drive it directly, and not having ec meter - DFR0300 - DFRobot Gravity: analog electrical conductivity meter V2 is specially used to measure the electrical conductivity of the aqueous solution. h> //This library is used to transfer data from arduino to nodemcu. h library. Our circuit can be used up to 24V. 3v, in that case a conditioning should be carried out of signal the simplest method that I have seen in ESR meter with Arduino. This dummy signal generator will be made by using a 555 timer chip. 1. Flow Meter using Arduino. Magnetometers are capable of detecting large objects like cars at tens of meters, while a metal detector's range is unlikely to exceed 2 meters. Arduino Portenta Breakout board is designed to help hardware engineers and makers to prototype and help test devices connections and capacity within the Portenta family boards (e. (BEST PRICE) US $78. For accurate results the measured value must not change much during the measurement interval. Respect project. It uses a Kelvin connection with the Monitor your well with an ultrasonic fluid level meter. This is why you remain in the best website to see the amazing book to have. Fisierul audio Hall Effect Sensor with Arduino - A1302 - Portable Gaussmeter Teslameter Gaussmeter with Arduino & hall-sensor CYSJ362A for B = 0-3 Tesla. Enjoy Free Shipping Worldwide! Limited Time Sale Easy Return. Modified and modernized, the plans for this Quantum Electric Generator (QEG) have been released to the public and made open source. com Tip Line; This project was created on 02/26/2021 and last updated 7 months ago. (BIG DEAL) US $1. For example - Lets say you have a tone (or white/pink noise) and you measure 100dB* on your "real" meter. To use it, just c Let’s start with a list of components we need for the project: 1 x Arduino microphone. This feature can be exploited to im Panel meters in regulated power supplies are used to display electrical parameters like voltage and current. 06 3% OFF | Buy Smart Robot Tilt Vibration Sensor Module Vibration Switch Alarm Module For Arduino Diy Kit From Merchant S+S+S+ Store. Optionally you can get the separate 5V power supply. Gauss and tesla are different units for the 'magnetic flux density' or 'magnetic induction'. I´ll mount a small speaker and the Meter or Arduino in a fixed Daniel’s version of the meter is based on a precision current sink and a high-resolution ADC controlled by an Arduino Nano. On the 6. //// 1 second's worth of microseconds, divided by the frequency, then split in half since Modification TTL UART from 5v to 3. Answer: Integration is approximated by simply summing many small intervals of the measured quantity. It has built-in simple, convenient, practical connection and long life (up to 1 year), which makes it very suitable for long term online monitoring. It makes all high-density connectors’ signals individually accessible, making it quick and easy t Using the SS495B Miniature Ratiometric Linear Hall Effect Sensor from Honeywell and the Arduino NANO. Otherwise, Arduino will be damaged. Circuit and working. 4GHz Antenna Socket Adapter Plate Board for Arduino Enjoy Free Shipping Worldwide! Limited Time Sale Easy Return. The Arduino sends the data by cable Analog Style VU Meter on OLED Display – Arduino Compatible. In this project we will use the RS485 interface to connect an Arduino to the meter and read out the values for total power consumption and real power. Build a musical Tesla coil! In this project we will see what Tesla coils (TC) are, how they work, a couple of variations and also how to build one in solid state (SSTC) whose purpose is to play music! The image below shows the entire system, consisting of 3 main parts: a switching circuit, a rectifier and an interrupter. Bindhammer • 06/05/2016 at 11:55 • 0 comments Analog pH Sensor / Meter Kit specially designed for Arduino controllers and has convenient and practical "Gravity" connector and a bunch of features. Basically, you can use every microphone that is compatible with Arduino just make sure that it has an analog output. I purchased a ONETOUCH ULTRA 2 blood glucose meter for reference measurements to calibrate the Arduino blood glucose meter. 75MPa For Water HeaterUSD 2. Atkin, Keith. It is able to read the incoming audio signal and create effects on the four 8x8 LED matrices. A Clock From An Electricity Meter. //Remember to install all included libraries first. TL494 IR2110 IGBT Tesla coil control doing a kind of tesla vu-meter or vu-tesla control can be controlled by motorda instead of high power PWM cycle tesla coil … The first tesla coil driver circuit used old tube TV or monitor EHT high Gauss Meter / Tesla Meter. • 4 planar Hall sensor – the perpendicular B-component. Industrial ph sensor for arduino has a built-in simple, convenient, practical connection and long life (up to 1 year), which makes it very suitable for long-term online monitoring. 5 mm audio EP socket for audio signal input. ZORO  You can install the Adafruit LIS3MDL Library for Arduino using the Library from the sensor and prints the micro-Tesla readings to the Serial Monitor. Then it's calculated as 20 x log (Reading/Reference). And, let's say you get a reading of 500** from the Arduino's ADC. Secondly, connect the 2-wire (A & B) RS485 between the converter and the meter; A connect to A terminal while B connects to B terminal. Its just that $10 vs. Connection is quite direct. 1 Gauss = 100,000 nT or 1 Gauss = 100,000 gamma. This is an accurate milliohm meter with a maximum resolution of 0. Then I will describe on making what's effectively a hand-held Tesla meter (aka a Gauss meter). 2020 You can install the Adafruit LIS3MDL Library for Arduino using the the sensor and prints the micro-Tesla readings to the Serial Monitor. Electric utilities across the world have been transitioning their meters from the induction analog style with a distinctive spinning disc to digital “smart DFRobot analog pH meter, specially designed for Arduino controllers and has a convenient and practical "Gravity" connector and a bunch of features. code Arduino. Condition is like new. The basic hardware setup was simple enough as well. The current sink is based on the LT3092 precision current source/sink which, using a network of resistors and transistors is set to function as a sink. 96″ OLED Display. 2 % by calibrating and adjusting the wattmeter. With everything in place we will have a Arduino Frequency meter and a square wave generator. The UART interface of the meter is 5v. arduino project NANO magnetic meter Instrument magnet oled HALL EFFECT SENSOR simple electronics easy chip instructions schematic code homemade diy flux meter This project is submitted for. This dissolved oxygen meter product is used to measure the dissolved oxygen in water, to reflect the water quality. Gravity: Analog pH Sensor / Meter Pro Kit For Arduino is a professional Arduino pH Sensor Meter Kit with an industrial electrode. The Apps allow you to monitor SOC (state of charge), Current, Voltage, cell balance, temperature, and more. I had already published one blog devoted RMS voltage measurements on full band 20 – 20 000 Hz audio signals. Reply. The reason we use the divider circuit shown in the bottom diagram is that Arduino’s input pins support a maximum of 5 volts. I was looking for a nice VU meter using the WS2812 LED Strip and found a link which I cannot remember to accredit but the code was limited to 50 LEDs so I have a play around and not it was address the limits of the Adafruit_NeoPixel. Home Meter-5 Hertz to 100 000 Hertz Dual Function AC Gauss Meter / Electric Field Detector / Magnetic Field Detector / AC Tesla Meter The International System of Units unit of measure for the strength of a magnetic field is the tesla. In order to switch the modus of the MX485 chip in driver/receiver, arduino pin D3 is used and controlled by software. 2K views. You now know that your meter should display 100dB, when the ADC Arduino-BMS. The value in this example is in the range 0 to 100 (I used it for showing humidity). The analogue meter has a moving needle that sweeps slowly with configurable speed to show the new value of a variable. UNO R3 ATmega328P CH340 USB Board for Compatible Arduino DIY. An Arduino Uno was used at that time, together with a 128×32 I 2 C OLED display, HC-SR04 ultrasonic sensor module, and a 9V lithium-ion rechargeable battery, I had myself a handheld ultrasonic distance meter! Distance 142cm: Meter 92dBA / Arduino -26dB Distance 100cm: Meter 97dBA / Arduino -22dB Distance 50cm: Meter 100dBA / Arduino -14dB How to change the code to adjust the readings? 🙂 But I´m not satisfied with the quality of the buzzer, also the sound spread is unfavorable. You could modift this code to Measure other liquids if you change the resitor and values at the top of the code. Build The Spirit Radio That Creeped Out Tesla Himself. 2021 It is a simple project that uses an Arduino nano for the acquisition of the analog signal produced by the Hall sensor and for the management of  Keywords: Tesla, Newton-meters, ADC, Arduino Uno, Hall Effect, Gauss. Projects Discussion and Showcase Science and Measurement. 99 With a gauss meter you can measure a magnetic field. (Any version of arduino can be used, here in this prototype I am using arduino nano). A flow meter is a device used to measure the flow rate or quantity of a gas or liquid moving through a pipe. Just connect the sensor to GND and VCC  4 feb. In a shop you pay around 120 dollar for a good gauss meter. Physics Education , v51 n2 Article 024001 Mar  5V Micro Tesla LSB for Arduino Replace HMC5883L Enjoy ✓Free Shipping Worldwide! Machine Flow Meter 1-30L/min 1. Keywords: Calibration, Hall effect sensor, Microcontroller, Teslameter, Atkin: Construction of a Simple Low-Cost Teslameter and its Use with Arduino and. Now, for this new  logo Publicado por Oscar Gonzalez en Arduino el 02/06/2020 Bobina de Tesla con el bobinado secundario hecho en la PCB. Engineers often measure magnetic fields in Gauss. This time measurements performed on single AC Power Grid frequency. This first demo will show you how to get readings of what an accelerometer does best: measure acceleration! Open up File -> Examples -> Adafruit LSM303 Accel-> accelsensor and upload to your Arduino wired up to the sensor. Hackaday. 1 volt reference. About Drag Arduino Race Timer . Liquid Data. This poor accuracy is mainly due to the tolerance of the internal reference voltage of the Arduino. Enjoy. Cheap Power Tool Accessories, Buy Quality Tools Directly from China Suppliers:BD243 BD243C Mini Tesla Coil Kit Magic Props DIY Parts Empty Lights Technology Diy Kits Electronics Module Board Enjoy Free Shipping Worldwide! Limited Time Sale Easy Return. the Portenta H7). Upload the sketch to your board and open up the Serial Monitor ( Tools -> Serial Monitor) at 115200 baud. This Program will give you a temperature based feed Using iOS device as teslameter (magnetometer discussion) In my app I want to detect how strong surrounding magnetic/electromagnetic fields are.

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