Questions tagged [sensors]
Use this tag for questions about selecting, connecting, using, and debugging sensors.
207
questions with no upvoted or accepted answers
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DHT22 reading weird values
I just hooked up a DHT22 I had laying around in a parts drawer to test something and it is giving out some crazy wrong values, I am running the adafruit library's unified example and this is the ...
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107
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Using 2 VL53L4CD ToF sensors and getting error after getting first reading
pretty new to arduino stuff and was hoping to get some help with my code.
I'm trying to use 2 ToF sensors and get continuous readings from them. I understand that I have to use the xshut feature and ...
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Integration of MAX30100 and DS18B20 Thermal Probe Integration
This is for my final year project that I have been tasked with designing a patient monitoring system. However, during the last stretch of model prototyping, I am experiencing issues with my MAX30100 ...
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Can't stop the 3 pin active buzzer
I was simply trying to program a buzzer with the ultrasonic HC SR04 and 128x64 OLED display. The buzzer is an active buzzer (3 pin) on a small board. The problem is that, once on, it never stops ...
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SHT30 giving wrong humidity
I have an SHT30 sensor which is feeding to my Arduino via an RS485 connection. The readings are coming in as they should be for both temperature and humidity. The problem, however, is that the ...
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299
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TFMini Sensors with Arduino
I have three TFMini sensors I need all of them to detect. I only got one to work , pins 4,5 . My info in coding is basic . I really appreciate your help . Thanks in advance.
I think the problem is ...
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457
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Problem in using COZIR W-100 with arduino
I was using the COZIR W-100 carbon dioxide sensor with an Arduino Mega 2560 with the example code from this site.
But the measured value of carbon dioxide by sensor was 90 ppm in fresh air and that ...
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3
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6k
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Read temperature (DS18B20) with the ATTiny85
I'm trying to read the temperature of a DS18B20 with my ATTiny85 - but I'm getting rubbish data :D
I should have gotten ~22 degrees, but I'm getting 129! I followed this tutorial i found here, but ...
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Slow I2C communication
To collect temperature and BPM, I connected a max30101 in my Heltec WiFi kit V3 with ESP32. The data collected are stored in arrays to extract statistical features from signals which an algorithm will ...
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261
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MAX30102 doesnt show data when it's interfacing with other sensors MLX90614 and MPU6050
The hardware I am using is ESP32 with MAX30102, MLX90614 and MPU6050 sensors and Using Blynk to show my data from the sensors. The issue I am facing is when I ran the code with all three sensors only ...
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133
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SPI problem with Bitcraze PMW3901 sensors and Arduino NANO
I am currently trying to connect four Bitcraze PMW3901 sensors to an Arduino NANO, but I seem to have issues with the SPI. When I connect two sensors using the code below, it works perfectly: I am ...
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201
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Strain Gauge with HX711 Load Cell Amp
I am trying to get a strain gauge working with the HX711 load cell amp. I posted about this a few months ago and got told to get some high precision resistors for the wheatstone bridge. I have now ...
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146
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Why doesn't LCD 16x2 work with fingerprint sensor code?
When I separate fingerprint code and LCD code it works fine. sensor read 6 templates which I already stored 6 fingers ID. When I combine the code it read 0 templates.
#include <Adafruit_Fingerprint....
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Two sensors on same ESP-32 board
Need some help on the project I'm currently developing.
I have 3 YF-B2 sensors that I need to connect to the same ESP-32 board and read the data from the sensors and send it via MQTT.
I had it working ...
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389
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Error compiling for board Arduino Nano 33 BLE
I am trying to use pulse sensor with Arduino Nano 33 BLE sense, but when I verify it, it shows Error compiling for board Arduino Nano 33 BLE. The code is from the pulse sensor website. The code works ...
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Problem in integrating speed sensor LM393 with L298N
I am currently working on a project that has an automatic support wheel for bicycle.
The mechanism of this project is when the speed sensor is detecting the RPM of the rear bicycle wheel it will ...
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Can I track 70 pressure sensors from Arduino Mega?
I am a beginner at Arduino which I just received in the mail. My understanding is my Arduino Mega has 54 digital inputs and 16 analog inputs making for 70 inputs all together. I would like to track ...
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5V Pressure sensor module with 3.3V ADC
I'm using ESP32 to read analogue pressure readings from this pressure transducer. My Problem is this sensor outputs 0.5V – 4.5V linear voltage output based on the pressure but ESP32 can only handle 0 -...
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1
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rf522 version 0x12
I bought a bunch of the common RC522 boards from some Aliexpress vendor. They (I tried multiple) seem to work at the register read-write level, but they don't seem to execute commands, much less ...
2
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585
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Soil moisture sensor problem
I'm having a problem trying to run a bunch of code, using an "if" state which uses a variable which should get a value from a soil moisture sensor.
I'm using the sensor digitally, so it should just ...
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473
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This is a flood sensor. Moisture sensor and servo working together but it shows different errors
Sometimes the servo moves unnecessarily without moisture sensor giving out any readings.
Another problem is that the servo moves very slowly. Is there a way to counter this problem?
const int ...
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83
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ADC pin shutting off on its own under certain condition
A0 pin not working when full PV system in use
I am using the DFRobot Leonardo with Xbee R3. I am using the A0 pin to read a 0-5V voltage from my voltage sensor, which samples and steps down 130VDC ...
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Different behavior when Arduino Micro powered by laptop USB vs portable charger USB
I'm working on a project that uses an LM35 temperature sensor to control a few LEDs. Above 97 degrees, one LED should switch on. Below 95 degrees, it should switch off and the other should switch on. ...
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259
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How can I configure the RFM95 LoRa module to emit packets at only 'one' particular frequency?
I have created a LoRa gateway using a Pi3; I have used a RFM95 module for it. So, it is a single channel gateway, and I'm operating it at 868.1Mhz. But my LoRa node(also a RFM95, on an Arduino Uno), ...
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389
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How can I connect a force sensitive resistor to a vibration motor via Arduino?
Please forgive me if my knowledge is limited--still very new to this!
I'm currently working on my senior thesis for my Industrial Design program and I'm struggling to figure out the components and ...
2
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Issue with PIR sensor
I have been using a HC-SR501 PIR module with my Arduino Mega and it was tracking presence pretty well.
Because of cost constraints, I decided to go with the low cost HC-SR505 sensor - bought a bunch ...
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2
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161
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IR sensor not detecting light or dark sufaces
I wrote code for the vibrating motors to vibrate when an IR sensor detects a darker surface. I have 4 vibration motors for corresponding 4 IR sensors. My program is not able to read the values from ...
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512
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How to create a heart rate detection system that uses a chest strap?
I want to create a system that uses a chest strap from available Bluetooth-based heart rate monitoring systems. The straps seem very convenient compared to available Arduino pulse detection systems ...
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545
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How to use Honeywell NBP Series Sensor with Arduino
I am trying to use a HONEYWELL NBPDANN100PAUNV Pressure Sensor.
I found an example here http://www.circuitstoday.com/interfacing-pressure-sensor-arduino
As this example says as instrumentation ...
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349
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DHT22: Library and Data accuracy
I am using DHT22 temperature/humidity sensor and I noticed that there exist so many libraries. I wonder which one is the most accurate?
It is giving me readings that does not seem to be logic. High ...
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262
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Problem with my Arduino project
I am making a smart bin which automatically sense (with the help of IR sensor ) and dispose the trash by moving with help of DC geared motor 12V 60 RPM and it also detects for obstacles with the help ...
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1k
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MQTT Broker on an Arduino
Has anyone here setup an MQTT Broker on an Arduino? I am looking to use pubsubclient to send sensor data from 12 individual wireless sensors to an Arduino every 250ms. I know this can be done using ...
user19216
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210
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Declaring Variables in a For Loop
I am trying to use a for loop for getting readings on two parallax ping sensors and want to find the difference between both readings.
But am having trouble doing so. Whenever I declare print ping(1), ...
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220
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How do I change the default number of parameters SDI 12?
I am a nooby so this might be an obvious answer kind of a question, but how do I change how many parameters arduino-uno reads from a sensor using SDI communication? My code (which was in public domain,...
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221
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Too many Bytes Using Ultrasonic Sensors
I need to send one transmission and record multiple distances with 4 receivers, but everytime I use more than 2 receivers, the serial data does not print. What can I do?
P.S. I'm using 5 SRF-02 ...
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SRF-02 UART, transmitting from one address to another
So I just starting playing around with UART and SoftwareSerial while playing with these SRF-02 Sensors - http://www.robot-electronics.co.uk/htm/srf02techSer.htm
I need help getting one to read to the ...
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115
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Teensy and MS5803 sensor
I'm trying to use the MS5803 pressure sensor with a Teensy 3.2. Compiling the Sparkfun, or other, libraries, however, results in no output.
Can you provide guidance on how to modify the libraries to ...
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86
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Serial print and sensor readings halts
I'm trying to write a state machine for my robot.
While the robot is moving around I would like to read the values of the sensors, but after some time the reading stops working.
For the first half ...
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573
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Arduino uno RF transmitter and receiver, MYSQL
i tried to connect my arduino uno and ethernet shield with Mysql and everything works fine. Then I tried to connect the RF transmitter and receiver. I use a similar code, but i have problem with ...
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168
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Arduino-controlled current limiter for lathe
I'm building a lathe that will be powered by a 3-phase 750w AC motor (4 pole, max unloaded RPM of 1400 RPM). I want to be able to control the RPM using a potentiometer attached to an Arduino mega ...
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66
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Sensors to use in Pets
I want to track my pets using some sensors (their location in space) but I could only find radio sensors. These radio sensors are big and cumbersome for my dogs to carry around.
Is there some sensor ...
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Problem reading HMC5843 - Magnetometer in Simulink
I'm having a SparkFun 9 DoF sensor stick including the following components:
ADLX345 - Accelerometer
ITG3200 Gyroscope
HMC5843 - Magnetometer
Im currently working on a project in which I need to ...
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682
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CO2 pressure regulator for keg
Is there anything like the link below that I can read/set with an arduino/raspberry pi?
I'd like to be able to control this completely from a computer in my kegerator setup.
Any search terms that ...
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Grove temperature sensor with Arduino Yun
I try to test Grove - Infrared Temperature Sensor on Arduino Yun with the sample code but it does not work. In the console it shows that the object temperature is out of range all the time. However, ...
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Using an ultrasonic sensor to act as a potentiometer for a Servo?
I would just like to start off by saying that I am new to Arduino so my code and approach to the wanted outcome are probably not the best. Anyway, I had the idea of using an ultrasonic sensor and my ...
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909
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ICP Accelometer Arduino
I need to connect piezoelectric accelerometer to Arduino. Precisely, it's this one: http://www.pcb.com/Products.aspx?m=352C34
Specs show that it generates 100 mV/g, but when I connected it between ...
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Could a bluetooth, speaker and microphone equiped arduino be used to form a range sensing swarm?
I am trying to figure out how to build a system of devices that could, on command, notify similar devices that are within a configurable distance. Maximum ranges would need to be around 20' though up ...
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Flame Sensors Problems
I am making a fire fighting robot and I need a sensor. I want the sensor detection range to be about 6m or 7m (about 18ft to 20ft).
The question is which sensor should I choose to get that detection ...
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How to Connect Two CQRobot Ocean Non-Contact Water/Liquid Level Sensors (CQRSENYW001) to Arduino UNO REV3 (A000066)?
I am a complete beginner trying my hand at a home automation project.
Part of my setup includes using an Arduino UNO REV3 (A000066), and connecting two CQRobot Ocean Non-Contact Water/Liquid Level ...
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Which temperature sensor is accurate?
I have an Arduino Nano RP2040 Connect with two temperature sensors. A DHT22 is connected to D2 and pulled up with a 5 kΩ resistor to 5V, and a LSM6DSOX IMU is built in to the board. Here's my code:
#...
