Serial monitor read wrong values of an heart rate sensor
Hi! I'm using an Arduino Uno R4 Wifi with a heart rate sensor (DAOKAI MAX30102), but the serial monitor suddenly decided to write wrong values. When there's no finger on the sensor, it writes -1...
View ArticleINPUT_PULLUP and DS18B20 OneWire sensors
Tried setting pinMode(..., INPUT_PULLUP) but it doesn't work and instead I have to use a 4.7 kΩ resistor. Does that sound right -- is INPUT_PULLUP useless? 4 posts - 4 participants Read full topic
View ArticleUsing Ultrasound for Tree Tomography with Arduino
Hello Arduino Community! I'm currently working on an exciting project where I aim to map the internal structure of trees using ultrasound tomography. The concept is similar to ultrasonography used in...
View ArticleDS18B20 - different readings
Hi I have 2x DS18B20 sensors on my system, one directly on PCB , the other is stainless steel capsulated and have a cable of 1,5 m. Is cable reason why it reads different around 0,7 deg Celsius? I...
View ArticleHello, I wanted to increase the current hours, but there is an error and I do...
#include <Adafruit_SSD1306.h> #include <Wire.h> #include <Adafruit_GFX.h> #include <RTClib.h> RTC_DS3231 rtc; byte settings = 0; byte off_zzz = 0; int m = 0; int h = 0; #define...
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Problems with readings with ad8323(ECG device)
Hey. guys. i have a problem. I connected the ad8323 board to an arduino uno which I connected to my laptop. The voltage at 3,3 v is on the 3,3 v supply pins (that is apparently not the problem) , all...
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Linear laser encoder
Good day. I purchased a linear encoder. Trying to test it, I assembled the following circuit. I wrote the following code int PinA = 12; int PinB = 2; int val = 0; int val2 = 0; void setup(void) {...
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ELEGOO RFID rc522 card not reading?
Hello, I have an Rc522 with a card and a dongle from the brand ELEGOO and it won't read the cards. I have been using the dumpInfo code from the library Rc522 to try and get the card UID (for another...
View ArticleArduino Uno with Sensor Kit Base and additional sensors
Hello everyone, This is my first post here so excuse me if I post incorrectly. This is my second time dealing with an arduino so I am also a beginner. I am using the Arduino Sensor Kit Base with an...
View ArticleSensor matrix reading
Hello, I have the below code to be able to read 4 sensors values (for example four resistance in a matrix). Can anybody explain to me why the below part should be set to LOW?...
View ArticleMotion Sensors: How to Know Which One to Use?
Hi yall, I have ZERO knowledge of coding, and i'm unfamiliar with Arduinos. I have to do a project for school were I will be constructing a motion activated pet feeder! I'm, looking for a motion...
View ArticleCurrent transformer with arduino
Hello everyone, I'm currently using a current transformer (CT) to measure the current consumption of my machines. I have based my application on the following example: OpenEnergyMonitor: CT Sensors...
View ArticleE3JK-R4M1 Reflective Photoelectric Sensor Switch
Hi, thinking about buying this switch for a hobby project. Before I do, just checking if it is possible to connect it to Arduino Uno/Nano and how. Thanks. It is a 12V 5 wire and it has a built-in...
View ArticleSaving flowmeter values to external eeprom on Arduino
I cannot save the flowmeter values to the 24c04 integrated circuit and read them again. When I cut off the power of the Arduino, the total liter of water passed is reset. My aim is not to reset the...
View ArticleSeeking Recommendations for Sensors in Automatic Pet Food Dispenser Project
Hello everyone! I’m currently working on an exciting project to create an automatic pet food dispenser for my cat. The dispenser will have several features aimed at providing convenience and ensuring...
View ArticlePlanning to build a Fetal Hearbeat monitor
Hello, I'm planning to build a fetal heartbeat monitor with Arduino for my final biomedical degree and I'dont know which sensor to apply. Please suggest any sensor, piezo or Doppler modul? And how do...
View ArticleProximity mode in max30105 ic
proximity mode in max30105 ic 2 posts - 2 participants Read full topic
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Help with incredibly variable (±50) ADC values
I am struggling to get the ADC on my Arduino UNO to take consistent analogue readings, even when connected directly to ground or 5V. Here is an image from Serial Plotter of what I am typically...
View ArticleACS712 sensor with arduino nano esp32-s3
I am new in this world and i have never used an esp32-s3 so i dont know if im doing good with my ADC or why this sensor is not reading well. My code is this one: float sensitivity = 0.066; void...
View ArticleBest way to connect multiple ds18b20 to cable
Hello! Please advise what is the most simple and convenient way to connect multiple ds18b20 sensors to a 3wire cable? I mean what type of сonnector to use instead of soldering it? Thanks, 2 posts - 2...
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