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Could be the 511 resistor pack problem.
Project Guidance / Re: I2C questions
Last post by Wawa - Jul 21, 2017, 11:16 pm
they are on a break out board but I can only use two because of the address code...
Connect the address selector pin to an output pin, and use it as chip select.
Then you can have as many as you want on the same bus.

Multiple grid-eye sensors on one bus?
I hope you do know that I2C has wire length limitations.
My problem is still continues. i tried everything again and still router don't give me an ip adress. i look internet properties in my pc i see DNS suffix adress (Ex. can i give  manually DNS suffix on arduino?
Generale / Re: Controllo Ventilatore
Last post by littlebuilder - Jul 21, 2017, 11:15 pm
non sapevo che i relè potessero incrementare un motore.
puoi farmi un esempio di sketch?
Displays / Nextion TFT
Last post by soaresmsr - Jul 21, 2017, 11:14 pm
Good afternoon, I never played with the Nextion TFT screens, I'm with a project with a 3.2 screen, but I have doubts ...

How do I send the commands to the screen and how do they return?
How can I call a page on the screen
Programming Questions / Re: clock /timer ???
Last post by aarg - Jul 21, 2017, 11:14 pm
This an algorithmic pseudo code; in actual coding, it will be replaced by while()-do structure!
Structured languages were designed in part, to support algorithms. Algol-68 even had it in it's name!
Motors, Mechanics, and Power / Re: What type of motor is it? ...
Last post by INTP - Jul 21, 2017, 11:14 pm
I did searched google..

the only answer that i have found that it is a brushless DC motor which doesn't make sense.
You must've just crawled out from under a rock where you've been living since the days of only having brushed motors. Brushless motors are now possible. Take your time, new tech can be scary, but it just took a switching of magnet and coil location to lose the brushes.

Computer fans are an example of a brushless dc motor with 3 wires. Power, ground, and a speed sensor.
Displays / Re: I2C LCD not displaying cha...
Last post by cattledog - Jul 21, 2017, 11:12 pm
I downloaded your hd44780 library and ran the I2CexpDiag sketch.
Please post the complete serial output for the I2CexpDiag sketch.

Deutsch / Re: Hilfe! Multifunktionstaste...
Last post by Tommy56 - Jul 21, 2017, 11:10 pm
Es gibt halt Leute, deren Hirn kann sich das merken und andere Leute. ;)

Gruß Tommy
Robotics / Re: Problem with car robot
Last post by vinceherman - Jul 21, 2017, 11:10 pm
Not good!

Can you show us how you have it wired up?
Posting a picture of a pencil and paper drawing is good enough.

Do you know that you need to go parallel?  If it works on only on side, you might be good to go.
My guess is that you don't know, because you are likely doing bench testing with the motor unloaded.
Once you put a wheel on the motor and put it on the floor, the motor will be loaded and it will pull more current.

Edit:  if all else fails, there are more modern motor drivers like the Pololu DRV 8838 for single motor drive
or 8835 dual motor driver
The have 1.2A per motor.
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