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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What do I have to change to make this code functional?

I have a joystick, an I2C 16x2 character display, and an Arduino. I want to move the joystick and get an on-screen character (specifically, the letter h) to move in the direction that I pushed the ...
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1answer
361 views

Start I2C communication at an external event

I'm working on a Arduino Uno and a ADC ADS1115. Devices communicate by I2C where Arduino is the master. I would like to use the ADC to the maximum of his possibility. So i configure the ADC to set a ...
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1answer
43 views

Arduino detect order of objects

I'm trying to find a way to detect blocks being placed on grid on a table. The table will have fixed places where you can place the blocks, but the user is allowed to place the blocks in any free slot....
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1answer
55 views

16/2 arduino I2C lcd display not lighting up?

I am working with an I2C lcd display with an arduino uno board I have connected the gnd pin to gnd of arduino uno and the vcc pin to 5V of arduino uno and the display is not even lighting up there is ...
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1answer
44 views

Increasing speed of Vl6180x Sensors

I have 5x vl6180x pololu ToF sensors. I have managed to hook up all of the sensors to the arduino via I2C by making each sensor startup at different times and when they do, changing their addresses, ...
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1answer
169 views

What is best way to get data from sensors if arduino is slave?

Im working on a project where i have motor controller(arduino nano) being i2c slave. Its job is to get RF24 data and control motor and at same time send data to master about motor... Currently i have ...
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1answer
11k views

NodeMCU with RFID RC522 and I2C interface LCD module together

I'm newbie in Arduino programming so I hope to get a clear answer. I have NodeMCU v1 12-E, I connected it with RFID RC522 as in attachment picture. Now my question: I need to connect I2C interface ...
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1answer
654 views

How to request data via I2C?

How do you program an Arduino Uno to request data over I2C, sending parameters defining the request? I'm trying to program Arduino A to read a sensor value from another Arduino B, and it first needs ...
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1answer
304 views

How to wirelessly communicate with I2C infrared thermometer

I've been getting involved with arduino recently as a means of improving a heating device which is quite small, a box about 15x10x5cm which I would like to rig with an MLX90614 infrared sensor. The ...
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2answers
249 views

coding problems

I'm working on a Arduino controlled solenoid motor project that I found on Instructables. I have been able to piece together what I think is most of the code but I'm getting some syntax errors and was ...
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2answers
431 views

Transmit data to long distance (120m)

I want to transmit data from multiple sensors to an Arduino and distance would be approximately 120 meters. What protocol or configuration should I use? Actually I am trying to read values from 5 ...
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1answer
378 views

Control multiple MPU9250 to start collecting data at the same time [closed]

Is it possible to use multiple MPU9250s for data acquisition at the same time? I want to use 10 MPU9250s in human motion capture, but how make all MPU9250 work at the same time so that make the data ...
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1answer
58 views

Arduino as Slave on I2C bus to read data from other I2C devices

Good afternoon; I am a bit new to the world of I2C bus. I'm trying to implement a project that have Arduino MEGA as a master and Arduino nano as slave. I have some I2C sensors that i want the slave (...
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1answer
74 views

How to use I2C library

My A4 and A5 pins are already hooked up to a LCD and I want to connect a MPU6050 as well. In a separate thread, someone told me to use SoftI2CMaster library to use other pins as SDA ans SCL. But I don'...
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2answers
84 views

How to make an I2C device undetectable

Please bear with me as I am a bit new to electronics and arduino. I am trying to have multiple sensors connected to an Arduino Mega through I2C Bus. That is working but I would like to have the ...