Questions tagged [calibration]

Use this tag with regard to ensuring that instruments are giving accurate readings as compared to a trusted reference standard.

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How to calibrate Arduino DUE analog readings?

I am having a problem with the analog readings on my Due. On pin A4 and A5 I am measuring voltages: double vcc = 3.288 // taken on pin 75 (ADVREF) ; analogReadResolution(12); result = analogRead(A4) ...
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40 views

Do we have to calibrate LDR before using it in a project?

I am doing a project with Arduino, making a synthesizer, in which an LDR is used. Before connecting the Arduino to a power source and use the project, do I need to calibrate the LDR like it is ...
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30 views

How to calibrate MPU 6050 thermometer?

I'm using MPU 6050 and there's a thermometer onboard. However, I looked through the chip set data sheets but could not find the instruction for temperature sensing. Could you tell me how to calibrate ...
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647 views

QMC5883L automatic calibration

I have a QMC5883L magnetometer, and a pretty basic sketch which just prints the values from X, Y and Z axis to the serial monitor. I want to use it in an application to detect changes in the ...
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1answer
355 views

Ultrasonic sensor underwater calibration

Does anyone knows how to calibrate AJ-SR04M using the Arduino? I am working on AUV. underwater reading from current code; it is giving continuous 20cm while moving inches. http://shop2.hanjindata1....
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25 views

Arduino loop over a function is always displaying 0 as final values

I trying to loop over a function in arduino to get values for 2000 times, and then divide it by 2000 to get an average offset: int16_t x_offset = 0; int16_t y_offset = 0; int16_t z_offset = 0; And ...
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3answers
295 views

How to filter or eliminate earths magnetic field readings around 3D Magnetic sensor?

Im using the SparkFun MAG3110 3D sensor: https://www.sparkfun.com/products/12670 My application is essentially to make a contactless "magnetic joystick" using a local magnet for accurate and constant ...
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1answer
4k views

MQ135 Gas Sensor Calibration [closed]

I have bought a MQ135 gas sensor. I have read online from multiple sources that a calibration/warm-up period of between 12-24hrs is required for the sensor to give its most accurate readings. I ...
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736 views

HC-SR04 calibration conditions

As is known, the speed of sound depends of temperature and Relative Humidity. I'm trying to calibrate HC-SR04 sensor taking account these factors. In SparkFun page there is no mention about ...
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830 views

Problems with ACS758 Hall Effect Current Sensors - Calibration and no Signal

I purchased 3 ACS758 Hall Effect Current Sensors datasheet on ebay. A 50,100 and 200A, all three are bi-directional. They look like this. With no current the 50A outputs 477 on the analogue input (2....
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Can't get constant reading with load cells

I'm really a newcomer to arduino and I'm trying to build a scale with four SEN-10245 load cells and a HX711. My issue is that I can't get constant readings in the serial monitor and I'm not sure if my ...
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5k views

How can I seriously calibrate ADC voltage readings with Arduino Nano?

I have been using Arduino Nano Analog input to measure voltages, in the range between 22-30 Volts. I want to measure it down to a tenth of a volt. Following the instructions found here: Read ...