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1  Products / Arduino Due / Re: MPU-6050 errors reading data on: February 02, 2014, 02:49:29 am
For the ones still trying to figure out how to make this breakout board work, I found the solution on Arduino Playgroud, and posted on this page: http://www.i2cdevlib.com/forums/topic/8-mpu6050-connection-failed/#entry352

It seens that you need to put pull-up resistors on the SCL and SDA pins. 10K worked here.
2  Using Arduino / General Electronics / Re: Problems with Transistor TIP122 on: January 20, 2013, 04:42:10 pm
Quote
An odd justification. Do you also put an electric heater in the bath just to test?

Ok, I understand what you tryint to tell me. I will make another circuit and came here later. Thanks.
3  Using Arduino / General Electronics / Re: Problems with Transistor TIP122 on: January 20, 2013, 02:08:20 pm
Yes. In fact, I was doing this circuit with a LED and a Resistor before.
I am not really worried about killing these batteries, the only thing that in annoying me is the currents that does not match.
4  Using Arduino / General Electronics / Re: Problems with Transistor TIP122 on: January 20, 2013, 12:51:50 pm
I am just testing the transistor.
I thougt that by puting a resistor on the Base, I would make the transistor limit the current that flows beetwen the Colector and the Emissor.
The 1K resistor should give me a 3mA current on the Base, which should give me (with a 1000x gain) 3A flowing from Colector to Emissor.
5  Using Arduino / General Electronics / Problems with Transistor TIP122 on: January 20, 2013, 12:23:45 pm
Hi, I was testing some things on my protoboard to learn a little about transistors.
I made this:


The batteries are two AA 1.5V in series.
The resistor is a 1Kohm.
The transistor in a TIP122.

I uploaded a code that just put Pin9 as OUTPUT and HIGH, so I can test the currents on the circuit.

1.Current beetwen the Pin9 and the Resistor: 1,32mA.
2.Current beetwen the Baterry(+) and the Colector: 0,43A.
3.Current beetwen the Emissor and the Ground: 0,32A.

I can`t understand this currents. I was expecting 3mA ((5-2)/1000) on the 1st case and 3A (1000(gain)*3mA) on the 2nd and 3rd.

Am I doing something wrong?
Is this circuit goinbg to damage my Arduino, since there is 0,32A going to the Ground Pin?
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