WII U RASPBERRY PI 3 FINISHED

[phdirnou]

If I am right you don't need so big resistors. Of course it depends on which LED you want to use.

Here is how I understood it:
The LEDs on the Home bord PCB get their power from the Teensy. The Teensy outpouts 5V. So if you use Ohm's Law then you get this:

For a blue LED with 3,2 V and 30mA:
R=U/I
R=(5V - 3,2V)/0,030(30mA)
R=60Ω

And for a red LED with 2,15 V and 30mA:
R=(5V - 2,15)/0,030
R=95Ω

I hope I understood it right. If not than please correct me.

[banjokazooie]

If I am right you don't need so big resistors. Of course it depends on which LED you want to use.

Here is how I understood it:
The LEDs on the Home bord PCB get their power from the Teensy. The Teensy outpouts 5V. So if you use Ohm's Law then you get this:

For a blue LED with 3,2 V and 30mA:
R=U/I
R=(5V - 3,2V)/0,030(30mA)
R=60Ω

And for a red LED with 2,15 V and 30mA:
R=(5V - 2,15)/0,030
R=95Ω

I hope I understood it right. If not than please correct me.

It is not about the current through the led`s. The teensy spec is 20mA driving current per pin recommended. So try not to go over this value.

[phdirnou]

Thank you banjo!
Than we need for a blue LED a 90Ω resistor and for the red LED a 150Ω resistor.

Can you please explain us how we can monitor the current battery capacity and output this via the LEDs?(e.g. red LED=critical battery status)
A code sample and a wiring diagram could be helpful.
Thanks a lot

[lordalex]

Hey Guys, i just started my project and need some help with teensy / retorpie button recognition.

i connected all the buttons via fpc connector / board with the teensy. I tested the connection with my multimeter and the resistance from the left shoulder button is too high (72) and i dont get the accustic signal.
Other problem is, that 2 more buttons have a connection, the accustic signal is there, but no button recognition within retropie / teensy on windows.

Is there a way to reduce the resistance if the button is pressed? Or reduce the recognition if button is pressed or not?

Appreciate your help

[banjokazooie]

Thank you banjo!
Than we need for a blue LED a 90Ω resistor and for the red LED a 150Ω resistor.

Can you please explain us how we can monitor the current battery capacity and output this via the LEDs?(e.g. red LED=critical battery status)
A code sample and a wiring diagram could be helpful.
Thanks a lot

Here is an easy tutorial how to make simple voltage monitor with sample code
http://www.instructables.com/id/Arduino-Voltmeter/

And code for status led just reads the value from analog input so you can set up different thresholds and light up an LED

Code: Select all

	if (analogRead(A0) < 624)
    {
    digitalWrite(Pin_LED, HIGH);
    }
    else
    {
    digitalWrite(Pin_LED, LOW);
    }

[phdirnou]

Thank you banjo!
Than we need for a blue LED a 90Ω resistor and for the red LED a 150Ω resistor.

Can you please explain us how we can monitor the current battery capacity and output this via the LEDs?(e.g. red LED=critical battery status)
A code sample and a wiring diagram could be helpful.
Thanks a lot

Here is an easy tutorial how to make simple voltage monitor with sample code
http://www.instructables.com/id/Arduino-Voltmeter/

And code for status led just reads the value from analog input so you can set up different thresholds and light up an LED

Code: Select all

	if (analogRead(A0) < 624)
    {
    digitalWrite(Pin_LED, HIGH);
    }
    else
    {
    digitalWrite(Pin_LED, LOW);
    }

Thank you very much for you response.

Can I read the voltage directly from the step down converter? So I don't had to use a voltage divider. I draw a this for better understanding:

Picture1.jpg (99.99 KiB) Viewed 9736 times

[banjokazooie]

Thank you banjo!
Than we need for a blue LED a 90Ω resistor and for the red LED a 150Ω resistor.

Can you please explain us how we can monitor the current battery capacity and output this via the LEDs?(e.g. red LED=critical battery status)
A code sample and a wiring diagram could be helpful.
Thanks a lot

Here is an easy tutorial how to make simple voltage monitor with sample code
http://www.instructables.com/id/Arduino-Voltmeter/

And code for status led just reads the value from analog input so you can set up different thresholds and light up an LED

Code: Select all

	if (analogRead(A0) < 624)
    {
    digitalWrite(Pin_LED, HIGH);
    }
    else
    {
    digitalWrite(Pin_LED, LOW);
    }

Thank you very much for you response.

Can I read the voltage directly from the step down converter? So I don't had to use a voltage divider. I draw a this for better understanding:
Picture1.jpg

No you have to read the voltage from battery. From step down you'll get always 5V so no point of doing it. Best place to read the voltage is on the output from the pololu switch - no battery draining when device is off.

[phdirnou]

Here is an easy tutorial how to make simple voltage monitor with sample code
http://www.instructables.com/id/Arduino-Voltmeter/

And code for status led just reads the value from analog input so you can set up different thresholds and light up an LED

Code: Select all

	if (analogRead(A0) < 624)
    {
    digitalWrite(Pin_LED, HIGH);
    }
    else
    {
    digitalWrite(Pin_LED, LOW);
    }

Thank you very much for you response.

Can I read the voltage directly from the step down converter? So I don't had to use a voltage divider. I draw a this for better understanding:
Picture1.jpg

No you have to read the voltage from battery. From step down you'll get always 5V so no point of doing it. Best place to read the voltage is on the output from the pololu switch - no battery draining when device is off.

Perfect
I made a new drawing:

Picture (Device Independent Bitmap) 1.jpg (84.61 KiB) Viewed 9710 times

What do you think banjoo? Is it possible to build it something more elegant?

Thank you very much

[banjokazooie]

Yep this will work

[Fredl]

Hi, I'm doing this build as well and was wondering: Banjo used the Powerboost 1000 basic, which can deliver 2A at 3.7V. Would it be possible to use the Powerboost 1000C as well? The data sheet isn't really clear on the actual amps it will deliver, it just says 1000mA+...

Banjo stated the whole system draws 1.7A, so thats a big "+"...

Or alternatively, what kind of battery charging circuit can I use in combination with the 1000basic?
(All the ones I find are charger & DC-DC-step-up combined but limited to 1A...)

Thanks!