Mindboards

I retried today with Lejos on my EV3.
( It's very cool to be able to install lejos on a SD without flashing the lego os on the brick !!! )

Reading a PCF8574 works perfectly with same hardware !

Lego original firmware issue ???

woow, very impressive !

With my Ev3 I do not succeed in driving a PCF8574 ( I2C-8 i/o) but it works with the NXT. I don't know why !!
But with an atmega no problem with both bricks.

Hi, At the beginning I just wanted to add power function motors to my newly bought EV3 set in order to move the arms of the Ev3rstorm. Then I was disappointed that I can not easily link my NXT and my EV3. So I have made two atmega328 based board to drive this ! First board to drive 4 powerfunctions ...

Hi, Here are some examples : https://sourceforge.net/apps/phpbb/mindboards/viewtopic.php?f=2&t=1584 https://sourceforge.net/apps/phpbb/mindboards/viewtopic.php?f=2&t=1595&p=14800&hilit=8574#p14800 and recently I used a PCF8574 to drive a ULN2803 with some transistor to drive 4 DC mot...

The NXT's analog input pins are connected to the 10-bit ADCs of the AtMega48 co-processor. NXC (and I assume all other programming languages) give the user access to the truly raw values. The analog inputs are also pulled up to sensor supply, through a 10k resistor. The Arduino analog inputs are co...

You mean 10 bit? A 10 bit number is a number between 0 and 1023. The NXT and Arduino both have 10 bit ADCs (although the analog inputs on the NXT have permanent 10k pullup resistors). How are you controlling the IR LED? I wrote an Arduino library for that as well, in case you're interested. yes i m...

So, NXT, Arduino and PCF8591 on I2C bus works well. ( thanks to mattallen37 ! ) Arduino is used to - have a 1024bit analog input ( more precise than NXT ) to detect resistive value of conductive foam. - manage IR LED to drive Lego PF motor. - manage PCF8591 to add more analog input. ( sound detector...

The arduino has been shipped to me, just for the week-end......

My wife will not be happy

I found on an old phone a 24c64rp chip from ST, this is a M24C64R4BN1T - 64 Kbit Serial I²C Bus EEPROM.
Planned to integrate this so that values can be stored and saved.

yes, i was speaking of an arduino uno ( translating to english permanently causes me to make this error :lol: ) Concerning RS232, the idea was to try with the NXT using this ( charge pump ) : http://s11.postimage.org/s10py6cbj/rs_232_transistor.jpg essentially for the fun, because there is less of r...