Questions tagged [i2c]

Inter-Integrated Circuit (I²C) is a bus for low speed peripherals. Use this tag for questions regarding how to use I²C with an Arduino, or for problems with I²C and your Arduino.

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Unable to find/connect I2C devices (SHT31 & SGP30)

I have recently purchased an Arduino Nano 33 IOT together with two sensors: Adafruit SHT31-D (https://learn.adafruit.com/adafruit-sht31-d-temperature-and-humidity-sensor-breakout) Adafruit SGP30 (...
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14 views

Pca9685 & WS2818B, 1 Nano

Arduino n00b here. I currently have an Arduino Nano set up to run 6 servos from a PCA9685 board. I'm looking to add 6 switches and 6 LED indicators to switch servo positions. What I'm curious about is ...
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24 views

Wire.requestFrom() from master triggers requestEvent() in slave, but data written by slave is not received by master

I have a Mega 2560 Master connected via I2C to a Teensy 3.2 slave. The master calls Wire.requestFrom(slaveAddr, (size_t)32) to get data from the slave. Master & slave code snippets shown below: ...
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66 views

I2C and softwareserial

Attempting to make gps unit with screen. GPS unit communicates over serial (Adafruit Ultimate GPS Breakout) and I can get GPS data through USB to my pc with Adafruit GPS library softwareserial ...
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16 views

BMP280 pressure as a DC motor switch - issues

I'm attempting to control a DC vacuum pump to turn off when it hits a BMP-280 reads a set pressure lower than when it spins up (guesstimate pressure, I've got it hooked up to tweak in person). ...
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108 views

I2C and SPI using sensor and Oled display

Im currently working on a project which displays vital signs such as pulse and oxygen on my display. Now, my sensor is connected through I2C while my OLED runs through SPI. Im trying to display the ...
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24 views

Connecting Arduino Uno to Arduino Leonardo

I have an RFID shield connected to my Arduino Uno, but I want it to be able to send keystrokes to the computer when I scan the correct card. I have the Uno set up correctly so that when the card is ...
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89 views

ESP8266 not working with MPU 6050 over wire library and I2C

I'm trying to use this version of ESP8266 to access MPU 6050. However, it's not working. https://www.amazon.com/gp/product/B07HF44GBT/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1 i.e. ...
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94 views

How fast exactly can MPU 6050 bus go?

I'm using nano to access MPU 6050 chip. However, it took 5ms to update the loop and was costing me lots of time. So I wanted to find out if there's a way to accelerate the I2C bus speed. Eventually, ...
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142 views

It is any DS2482 I2C to 1-Wire bridge functional library?

Please let me know if you know any good library for DS2482 I2C to 1-Wire bridge. I tried to use https://github.com/cybergibbons/DS2482_OneWire library but I got errors when I'm trying to run the ...
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334 views

Best way to send I2C commands between Arduino and ESP32

I made a board with an Arduino nano and a ESP32 Dev kit. I connected them via I2C with voltage adaptation. I'm using arduino IDE and the related library Wire.h. I send messages as ascii chars or ...
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24 views

I2C Communication Matlab - FDC1004

I have a ProtoCentral FDC1004 board (datasheet: http://www.ti.com/lit/ds/symlink/fdc1004.pdf) connected to an Arduino. I am then trying to connect to the system via matlab. I have found the address (...
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209 views

SSD1306 recognized in I2C scaner, can't get it to display

The gist of my issue is in the title. I have a cheap ebay SSD1306 128x64 display which I hooked up to my arduino, and checked the wiring at least 50 times and the address is correct, the display has ...
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44 views

I2C sensor hogs the bus with empty write commands

I am trying to read data from a pair of TLE493-W2B6 magnetic position sensors [1, 2] with Arduino over I2C. I can read from each sensor individually, using the Arduino library from the manufacturer [3,...
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105 views

USING HX711 ( WITH LOADCELL) WITH PCF8574 IN NODEMCU

I have used hx711 and loadcell with nodemcu (esp8266) in its D1 and D2 pins ( here I have used Logic level shifter and a 5v supply to power hx711).It worked perfectly fine. Due to the lack of enough ...
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43 views

MPU6050 - Why is my gyro integration incorrect?

My situation: I am able to communicate over i2c with my MPU6050 IMU I can get accelerometer and gyro data I can compute the sensor's orientation using my accelerometer Issue: when trying to compute ...
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43 views

Problem with printing keypad input to the LCD in a while loop

this is my first post here, though I have been following this forum for a while (pun intended). I am trying to write a program for a machine that will drill holes in a metal rail, and cut the rail to ...
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77 views

I2C Hangs (sometimes) when Wire->endTransmission() is called

Architecture MKRZero BME280 Atmospheric Sensor SSD1306 128x64 OLED Screen SparkFun GPS: device: https://www.sparkfun.com/products/14414 arduino library: https://github.com/sparkfun/...
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34 views

MPU6050 with Arduino I2C Unreliable with Motor Noise

I have an autonomous wall-tracking robot that uses relative angle changes from a I2C-connected MPU6050 module along with ultrasonic 'ping' sensors for motor speed control to acquire and then track a ...
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11 views

STM32F103C Connection to MPU6050 Only works less than half the time

I am programming the STM32 Blue Pill board via the Arduino IDE. I have been stuck with this problem for a very long time and it is becoming immensly infuriating. The MPU6050 connects and gets ...
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42 views

Compass heading not varying linearly

I am using an HMC-5983 magnetometer compass on my arduino uno to find the heading of a car I'm building.But my compass readings aren't varying linearly.For example when I physically turn my compass by ...
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32 views

FIXING BUG when Using Wire library to obtain compass heading

I am using the HMC-5983 magnetometer module to obtain the compass heading of a autonomous car I am building using the arduino platform.I'musing the Z axis and X axis to obtain the heading. However ...
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193 views

Arduino nano with 128x64px OLED freezing

I have an arduino nano, MCP3424 i2C ADC and a 128x64px i2C OLED display. The function is quite basic; the arduino receives information from the ADC and prints it to the screen as described in the code ...
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132 views

Reading I2C data from SW6106 register

I am using the SW6106 powerbank IC as an I2C but no matter what I have tried I couldn't read something other than "FF". Datasheet for the IC. Timing diagram for reading data: Timing diagram for ...
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65 views

i2c man in the middle

I'm developing a bridge, or man in the middle for touch controller and a system board connected with I2C. The connection is: Touch Controller(slave)---I2C---(master)STM32(slave)---I2C---(master)ARM ...
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21 views

nodemcu nack error bh1750

I am trying to run a simple example of bh1750 on my nodemcu, code is #include <Wire.h> #include <BH1750.h> */ BH1750 lightMeter(0x23); void setup(){ Serial.begin(9600); Wire.begin(...
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109 views

Completing an action on button release help with delaying to give other modules time to repond

I'm currently having problems with my code it has several modules within the main one is my current keypad one working of a mcp23017. what I needed it to do is count how long a key is pressed and upon ...
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50 views

Byte not written to the memory

In the following code I'm computing crc and setting it as last (11th) byte in the array. The problem is it's sent on I2C just when I print it on the serial terminal. static constexpr uint8_t ...
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276 views

Connect arduino nano and ESP32 with I2C on the GPIO7 and GPIO8?

I made a mistake connecting SD0 (GPIO7) and SD1 (GPIO8) with the SDA and SCL on my arduino nano. I got confused with GPIO21 and pin21 and GPIO22 and pin 22! Since I made a PCB prototype, I would ...
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34 views

Communication between arduino nano and MCP3424 over I2c pt. 2

I'm am completing a project of mine that uses an MCP3424 i2c 18bit ADC and an arduino nano to measure temperature with an NTC thermistor but am having trouble with the arduino wire library. This is my ...
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42 views

Emulate I2C BMP180

I want to know if possible to emulate a temp sensor such as BMP180 with Arduino. The reason I am asking this is : BMP 180 is obsolete, so I am trying to replace it with BMP280 I want to read the ...
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62 views

How do you write to a specific register using I2C communcation?

I am trying to write to a charging IC (BQ24193) and I am trying to figure out how to use I2C to write to a specific register so I can set up the charging IC properly. I have watched a few videos on ...
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47 views

qMenuSystem Oled I2C can't make it work

I'm trying to make the qMenuSystem to work with my I2C Monochrome OLED display but without any luck. To summarize all here's what's with it : - the qMenuSystem is using a library called : ...
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41 views

Why is I2C OLED failing to initialise when SPI device is added to project (SD.h causing issue)? [duplicate]

My project uses an RTC, GY-521 MPU-6050 3-Axis Gyro and MakerHawk OLED Display Module. All working fine together to show current date and time as well as displaying Acceleration on 3 Axis. I now want ...
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43 views

Slave to Send Data after Receiving Command using I2C

I want to have my Slave Arduino to send signal to Master after the command was made. But the Slave Arduino does not proceeds to sending the signal after doing the command. What is wrong with my code? ...
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45 views

Understanding datasheet of a HCHO gas sensor

I have a gas sensor whose datasheet is attached: DS-HCHO Now it says that UART communication is needed (P2P) where it (module) waits for Data Frame before tx the data frame to host which I need. ...
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1k views

Using ESP32-CAM (with ov2640 camera image sensor) to send image via USB

I was trying to obtain image from ESP32-CAM (with ov2640 camera image sensor). I obtained the image through camera web server by connecting the ESP32-CAM and PC to same wifi network. A USB to TTL ...
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48 views

Two arduino boards with sensors i2c

I am new and lost I have been searching the internet about how to transfer data of multiple sensors from one Arduino to another using i2c but no luck. all the codes and tutorials online focus on ...
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82 views

Setting up I2C with HTU21D, no response after beginTransmission

I'm playing with the temperature/humidity sensor HTU21D. Datasheet: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Data+Sheet%7FHPC199_6%7FA6%7Fpdf%7FEnglish%...
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80 views

Communication with sensor KMX63 in I2C

I trying to use a new sensor the KMX63 with a Arduino Uno board, my sensor is on a evaluation board made by kionix. For the connexion il linked as follows: | Pin Uno | Pin evaluation board | | A5 | ...
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57 views

I2C freeze on master

On my first big Arduino-project I made a game using the following Arduino's and the I2C-protocol: 1x Mega as master 4x Mega as slave 2x Uno as slave The Arduino's controll a physical game where the ...
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38 views

NFC wont send URL to mobile phone

I'm using nfc 2 click (NT3H2111), I tried via arduino to send data to my mobile phone using this code : #include <Wire.h> int i = 0; int j = 0; uint8_t NDEF_DATA[] = { 0x03, // NDEF Message ...
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53 views

Servo PWM Pin seems to be interfering with Wire.onRequest i2C function

A newbie here. I am thinking of interfacing Raspberry Pi with Arduino via I2c to control a few servo motor (as RPi have limited PWM pins). Meaning I would send input from RPi to Arduino to allow to ...
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22 views

Arduino Setup for RF Transmit and Receive, IR Receive, WS2812 LEDs and a Piezo Speaker

I am new to Arduino and microcontroller in general and just finished one Project (TonUINO - a DIY music box for kids). Now I am planing and working on my next project. A IR shooting range. The guns ...
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86 views

Calculate pullup resistor, cat5e ftp

let me describe my schema, i got one arduino and one esp32 connected over i2c using 30m cat 5e ftp cable, I'm using 12v to power up both devices, each of them have dc-dc converter that convert to 5V, ...
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158 views

Does LabVIEW Linx affect the communication speed with Arduino?

I am using LabVIEW to connect to Arduino Mega. I control a logic gate to switch the current On/Off and at the same time there is an I2C connection with a sensor. It came to my attention that the ...
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58 views

Arduino 3.5" TFT Display going blank after sending data through I2C

I'm trying to use I2C to send and receive commands between an Arduino UNO R3 and an Arduino Mega R3, with a 3.5" TFT display connected to the Mega. I have verified that my display is fully functional ...
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36 views

Trouble with i2c on ESP8266

I have used with partial success I2C with the ESP8266. When it works, it works well, with many devices on the bus. I've examined the signals on a 'scope to assure Vlo, Vhi, Tr, and Tf. However, ...
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77 views

I2C between two arduinos

I have 4 gyro sensors that communicate to arduino uno using I2C and then arduino uno sends the data to arduino mega. I was wondering if I could use i2c for this purpose or if I should look for other ...
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64 views

Lost with Nano and i2c

I've been struggling with some code that was failing to "begin()" any devices on my i2c bus. I've uploaded a scanner program from arduino playground which lists the addresses of any i2c modules found. ...

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