Tagged Questions
2
votes
1answer
117 views
TLC59116F (i2c led driver) everything seems ok but LED doesn't work
I'm trying the LED driver TLC59116F with an arduino UNO R3. This IC is a i2c controllable LED driver with PWM and 16 outputs. The registers seem all loaded fine, here's a print of their contents:
...
0
votes
2answers
81 views
Strange I2C behavior: sometime it works, some time it doesn't
I am using Arduino Ethernet with PoE and Arduino Uno boards. In recent days I implemented a working I2C bus by using the Wire library and all it seemed almost to ...
1
vote
1answer
98 views
I2C with DS1307 hang after end of transmission
I've got a home brewed RTC with DS1307. I've put two pullup resistors on SDA and SCL lines, connected them to the Arduino 5 and 6 pin respectively. I've also provided a backup battery since I read ...
0
votes
2answers
136 views
I2C temp sensor and an Arduino wifi shield not working together
I am using an arduino wifi shield and a TMP102 with an arduino uno rev2.
With boards older than rev3 you have to add a jumper from the 3.3V to the IOREF pin for the wifi shield, see here: ...
2
votes
2answers
176 views
Sync 12 Arduinos - I2C vs Serial
I've been given 12 arduinos (Mega) and 12 breakout boards (custom built. they pump up the output of the digital pins to 12v @120mA) to control around 300 LEDs. I'm using a pseudo PWM library to fade ...
5
votes
4answers
496 views
DS1307 power failure problem
the DS1307 has two power sources the main VCC source and the back up battery, which must feed the DS1307 when the power goes down and keep timing and here my problem,
I am facing a problem with the ...
0
votes
2answers
335 views
How to test an atmega (arduino) i2c network
First of all sorry for my bad English and for this "theoretical" question on how is the best way to do things. I'm just out from university and no-one ever told me how problems can be resolved in a ...
1
vote
1answer
151 views
Multiple masters for i2c device
I have a DS1307 RTC chip that I want to interface with multiple masters.
One, an ATMega chip, will only ever really need to pull time data from the chip and the other (probably just an ATTiny) will ...
4
votes
3answers
234 views
I2C wiring help
I have 64 i2c devices wired together. They all seem to work correctly until randomly between 30s-1m of sending signals, the bus will hang.
Here is how I have it wired:
It's currently wired as ...
22
votes
4answers
3k views
\$I^2C\$ 3.3 to 5.0 V conversion
I'm trying to interface a 3.3V \$I^2C\$ device to a 5V Arduino.
I don't have any problem with SCL line.
I can use a simple voltage divider but I have an issue with the SDA line as this is ...
1
vote
1answer
343 views
communication between 2 arduino crash when external power supply is plugged
i have one arduino mega that communicates with one arduino leonardo.
the leonardo controls some motors (mega tell to the leonardo how many step to do... leonardo is a coprocessor for the motor in ...
1
vote
4answers
1k views
ATTiny25/45/85 as I2C master AND slave
I'm still trying to wrap my head around I2C as well as the ATTiny. I've found plenty of tutorials on how to use the tiny as an I2C slave as well as master, but is it possible to use it as both at the ...
1
vote
1answer
444 views
Multiple 4-Digit 7 Segment Displays with Arduino
I have 3, 4-Digit 7-Segment Displays from Adafruit, and the included docs/ libraries say I should connect the display to pins A4 & A5. However, I have three of the displays, so I am looking for a ...
1
vote
1answer
853 views
BMP085 and Humidity and Temperature Sensor with arduino
I am doing a project that requires me to use a BMP085 (with breakout) and a humidity/temperature sensor (with Breakout).
I am trying to attach both of these to the arduino uno through two analog ...
1
vote
1answer
506 views
Soft i2c with Sensirion SHT21 sensors on Arduino Mega
I have tried checking with an oscilloscope on the analogue pins when the sensor is plugged in and I don't seem to get anything as I normally would.
The hardware i2c channel works just fine on the ...
