Connect K33 with Arduino Mega 2560 Rev 3
Hello Currently testing The K33 sensor with the Arduino to test CO2 readings via I2C. Which pins are used for I2C_SDA and I2C_SCL should it be pins 20 and 21 or the SDA and SCL from the top right of...
View ArticleProblem with MPU6050 sensor
I've connected two MPU6050 sensors to one Arduino UNO board, and connected the ADO pins to GND and 3.3V respectively. For some reason, both sensor values go to the same ADO value and whenever I wave...
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DHT21 wrong value
I was testing DHT21 sensor in Uno for a project, which printed weird value so i changed. With no success so i went to another. Again, no difference. I do not want to believe that we have 4 sensors,...
View ArticleCapacitive Sensors Library Errors in the console
Hi! I'm using capacitive sensors library by Paul Bagder v.0.5.1 and my console writes these error messages with arduino uno r4 minima. How could I solve it? In file included from...
View ArticleI need help with making SpeedStacks timer!
Hi, I'm trying to make a SpeedStacks timer, with buttons. Right now, it's supposed to print a message to the serial monitor at 9600 baud. It does not work, though. Here's my code: #include "pitches.h"...
View ArticleBNO08x without Cable Connection
Hello, So I am building a project where an OLED display can print the angles of yaw, pitch, and roll using data from the Adafruti BNO08x. Using the example codes, I could print out the angles on the...
View ArticleML8511 and OLED with ESP32 connection issues
Hello everyone, I'm having trouble with a project where I'm using an ML8511 UV sensor, an OLED display, and an ESP32. Unfortunately, I'm unable to connect to the web, and the sensor readings are not...
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Tuorial on ADXL345 3-axis Acclelerometer using Arduino UNOR3 and Breakout Board
1. Introduction The ADXL345 3-axis accelerator sensor supports I2C Bus, 4-Wire SPI Port, and 3-Wire SPI Port operations. However, the Breakout Board (Fig-1) has come up in I2C Mode. To operate the...
View ArticleHigh definition monitoring
I want to monitor events that are very short in time (milliseconds) and not predictable. So I think I could dedicate one board to monitoring only and report the event on an external memory. I would...
View ArticleRain sensor interrupt pro mini sleep mode
Hi all, i have problems with my programming which is I want my rain sensor interrupt Pro Mini Arduino. I've got rain sensor interrupt Pro Mini, but it happen only once. Second time i try the Pro Mini...
View ArticleMy Lap and PC couldn't find HC-05 but my phone does
I'm using an Arduino Uno board with DHT11, HC-05, and PMS7003 connected to it. When I try to receive a signal from HC-05 to my mobile phone, it connects. But when I tried to connect it to my Desktop...
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How to connect the 2 Pin IR Receiver
I brought this IR Led receiver How can i connect it with ardunio nano to print the HEX code of any remote button ? 17 posts - 5 participants Read full topic
View ArticleCollecting Data from O2, °C, CO, CO2 and humidity sensors
Hello, I have a new project where I need to use various sensors as analog inputs. The sensor values should be displayed on an LCD and stored somewhere for at least 48 hours. The intervals between...
View ArticleMPU9250 I2C communication trouble
Hello, I am trying to connect MPU9250 to Arduino UNO board and read sensor data from it via I2C. 1.arduino board : UNO R3 2.sensor : MPU9250 3.IDE : 2.3.2 <What I did & Problem> 1.I soldered...
View ArticleHelp Needed with SPEC 110-601 SO2 Sensor Pinout (6 Pins)
Hello everyone, I’m working on a project using the SPEC 110-601 SO2 sensor, which has 6 pins, but the datasheet I have is unclear about the function of each pin. Could someone please help me identify...
View ArticleHelp with calculating Optical Encoder RPM
Hey all, I have an optical encoder with PPR of 320, and I want to calculate the RPM of the shaft as it rotates. From my understanding there is a couple of ways to do this, either with a period or...
View ArticleWeather station project
Hello everyone. I hope you could help me with my project because I am at a loss for solutions. I am a beginner in the field, which is why my last hope is found here. So my project is to make a weather...
View ArticleMagnitude of acceleration vector not 0 at rest
I want to rectify ADXL345 readings so they are only positive and based on 0 when at rest, but the value of mAV fluctuates between 0.31 and 0.47 although the set-up sits on a concrete basement floor,...
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Arduino connection to 4-20ma gas sensor
Hello, I'm interested in connecting TOC-903-X5 gas transmitter to Arduino to log the gas levels over time. I'm having trouble understanding how to wire the analog wire from the transmitter. In all the...
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ADXL345 punch level detection
I have this state machine to detect three levels of punch impacts on a wall-mounted PU-mat (no scientific project), using two thresholds and two yellow and red LEDs (later there will be three...
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