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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need help hooking up an oled display
recently i bought this oled display .
http://www.wvshare.com/product/0.96inch-OLED-A.htm
how can i connect it with arduino . Driver Chip is SSD1306 . Supported Interface are 3-wire SPI, 4-wire SPI, ...
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Arduino Yun - not enough i2c & interrupt pins?
I'm trying to build a small personal weather station. The rain sensor, and wind speed sensor use interrupts. The barometric sensor uses i2c SDA and SCL.
Reading the Arduino Yun manual, it says there ...
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Problem connecting Arduino Uno with Wifi and NFC
I'm new here and also new to Arduino.
I've got a rather specific problem and I've posted to the official Forum
on arduino.cc two days ago (original Post)
Sadly, I've yet to recieve any help and ...
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Burning sketch with I2C
Not a pure Arduino question really. I'm actually using a standalone ATmega168. So far I've been using AVR-ISP programmer (working from AVR Studio) to program the chip. After everything is done, the ...
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Cheap Wired Multipoint Mesh Network
I'm looking to make a 15 x 15 grid of load sensors and RGB LEDs for an interactive dance floor. Each node will be driven by an arduino and the entire floor will be managed by a RaspberryPi. I'm trying ...
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I2C RTC returning bad times - sometimes
I have a TinyRTC I2C clock in one of my Arduino projects, and it works most of the time. But occasionally, it will report the time as 165 hours, 85 minutes and 25 seconds (165:85:25) for a couple of ...
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I2C seems to stop working when I attach an AF motor shield
I have a cheap MPU 6050 chip that communicates over 3.3V I2C. I can talk to it just fine on my Leonardo. If I add an additional Adafruit Motor shield (the old one), my MPU 6050 demo sketch hangs ...
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Using an Adafruit Trellis to control a set of relays
I've been going through my program again and again, and I can't figure out what is causing it not to work as intended. First, the story: I'm trying to use an Arduino to control a bunch of relays ...
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Cannot read from 2 I2C slaves consecutively
I am currently trying to communicate between 3 Arduinos using I2C. One of them acts as a master, while the rest act as slaves.
I can request data correctly from the master. But if I were to do 2 ...
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9 DoF Sensor Accelerometer Readings Inconsistent
I have the following sensor stick: https://www.sparkfun.com/products/10724
It has an accelerometer, gyroscope, and magnetometer.
I have connected it to an arduino and am reading the accelerometer ...
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Is i2C more or less robust than GPIO?
Currently using i2C to connect a RPi with an arduino. It seems i2C is quite finicky and, drops the bus immediately if there are any IO errors. Since what i am building is meant to be semi permanent, I ...
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Proxying streaming i2c data(int values) to serial
The following code works correctly in reading single int values. It also works correctly for 3-4 seconds if I 'stream' the values in constantly (Mouse move coordinates) before I get an IO error and ...
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Receiving two-byte int values over serial
I am using Python smbus write_word_data method to send int values from a Raspberry Pi to an Arduino using I²C.
This seems to be the correct method.
When I send values from 0-255, I see the following ...
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Lockup while evaluating Wire.requestFrom function (Arduino)
I am currently working on a Arduino project that combines an InertiaOne IMU sensor board (from Atmel), with an Arduino UNO and two motors driven by a Makeblock driver board. All sensors communicate ...
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GPS - Speed doesn't update as should - EM408 & Arduino Mega & GSM
I'm developing a system that will get the GPS signal and send it though the GSM with information about position, speed and temperature from some digital sensors.
Currently I'm using the GPS EM408, ...
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MCP7940 RTC Library
I am looking to implement a Microchip MCP7940 real time clock into my sensor data logging circuit that I have based on the Uno. Would the most logical solution be to attempt at changing an existing ...
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I cannot find the I2C device by scanning
I've been trying to get a LCD I bought from deal extreme to work for some time with my ATTiny85 chip. It should be capable.
I've tried googling the device but there is no proper documentation, so I ...
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I2C 2 way communication between Arduino Uno and Arduino Mega
If I remove the transmission code from slave this works properly but I need to transmit from slave.
Here is my master code
#include <Wire.h>
void setup() {
Wire.begin(3);
Wire.onReceive(...
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I²C with ATTiny85 at 8MHz using TinyWireM library
Hello fellow Arduino enthusiasts, I am trying to make the ATTiny85 talk I²C with a MMA7660 breakout board I have (it's an accelerometer, this is a follow up question to my previous one).
I would ...
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Connect two Arduinos using I²C (wiring)
Altough having found a lot of documentation concerning wiring of I²C buses, I'm still not sure about the following question:
If both devices use separate power sources, is it a good idea to connect ...
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Best way to interact arduino and python
So, i've worked with the pySerial module for python, where I communicated with my arduino via serial. However, this module only works for 32bits and I would like to make my project work on both ...
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Interfacing Arduino through USB or I2C?
I am planning to connect multiple Arduinos to my Raspberry Pi. There are basically two ways I can achieve that:
Use an USB hub. Each Arduino will then be available through ordinary serial commands ...
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Reading CMPS10 raw values
I've got a cmps10 compass module hooked up to my arduino due through a logic level converter. I am writing code to convert the raw magnetometer readings into a bearing that I can use but have run into ...
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Arduino Master-Slave Pins
Can I change the pins on the communication for a Master-Slave arduino Wire transmission? I want to communicate between 2 arduinos, but on one of them A4&A5 are taken
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Arduino to Raspberry Pi wired communication
I am new to Raspberry Pi (just brought mine before writing this post), and I am looking to see what is the most ideal way for two way communication between an Arduino and a Raspberry Pi (USB, SPI or ...
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Adding devices makes I2C read 0
I'm using an Arduino Due with a logic level converter to interface with two different 5v sensors via I2C. Being of poor quality, these sensors have no data sheet.
When either one of these sensors is ...
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Connect Arduino with fischertechnik TX Controller
Is it possible to cinnect the Arduino with a fischertechnik TX Controller? Maybe with I²C, but i want to use I²C for something else on the arduino. So are there multiple I²C Ports on the Arduino (I ...
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LCDs larger than 20x04 and 5" diagonal
Are there any i2c LCD screens that are larger than 2004 characters and larger than 4.8 x 2.7 x 1.2 inches in dimensions?
I have the Sainsmart 2004 LCD but it can't display all the information that I ...
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Are there any good and maintained libraries for using DS2482 I2C to 1-Wire bridge?
The DS2482-100 and DS2482-800 are I2C to 1-Wire bridges which are useful for driving complex 1-Wire networks.
These are natively supported by a number of packages in Linux so you can interface easily ...
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How do I use I2C devices with Arduino?
I have a few useful I2C components, such as a 16-bit port expander (MCP23017), which I'd like to use in various projects.
What do I need to do to make these work with Arduino? Will it work with any ...
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