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by chrney
Sun Sep 08, 2013 6:34 pm
Forum: Troubleshooting
Topic: HDMI shall not trigger tv to switch on, only amp/audio
Replies: 4
Views: 1627

Re: HDMI shall not trigger tv to switch on, only amp/audio

Thanks.

I have unfortunately no clue on where to start with that pdf. The turn-on method mentioned worked just fine, but the switch-off thingie did not work.

Any idea how to proceed from here?

Thanks, again.

Christoph
by chrney
Sun Sep 08, 2013 5:13 pm
Forum: Troubleshooting
Topic: HDMI shall not trigger tv to switch on, only amp/audio
Replies: 4
Views: 1627

HDMI shall not trigger tv to switch on, only amp/audio

Hi, I am using an Onkyo SR507 amplifier and would like to use it for a little webradio-project. I stream the music through HDMI-output of the Raspberry Pi, as that's (probably) my only chance to switch on the amplifier using the HDMI CEC-feature. But, as I have several devices connected to the ampli...
by chrney
Mon Nov 05, 2012 7:50 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Voltage with level shifter ~1.2V
Replies: 49
Views: 3361

Re: Voltage with level shifter ~1.2V

How come that I always just get 4.5V? Should that not be 5V, straight through?
by chrney
Mon Nov 05, 2012 7:42 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Voltage with level shifter ~1.2V
Replies: 49
Views: 3361

Re: Voltage with level shifter ~1.2V

Yes, yes i can.
by chrney
Mon Nov 05, 2012 7:39 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Voltage with level shifter ~1.2V
Replies: 49
Views: 3361

Re: Voltage with level shifter ~1.2V

I tested the display the GPIO-way (connecting 12 out of 16 wires) - that worked just fine. So the display is good then, I guess?
by chrney
Mon Nov 05, 2012 7:34 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Voltage with level shifter ~1.2V
Replies: 49
Views: 3361

Re: Voltage with level shifter ~1.2V

Without resistors = no change

SDA och SCL connected to GPIOs = display flickering, meassured 3.3v on the display's SDA and SCL - but, it finds the device on i2cdetect -y 0.
by chrney
Mon Nov 05, 2012 7:20 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Voltage with level shifter ~1.2V
Replies: 49
Views: 3361

Re: Voltage with level shifter ~1.2V

Sorry, I still don't get it - as I said, I am quite a noob here. So:

a) should I power off the Pi? That is, to pull the power cord? Not likely, but anyway, checking.
b) Where should I place the plus-"stick" of the multimeter,
c) where the minus-"stick"?
by chrney
Mon Nov 05, 2012 6:21 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Voltage with level shifter ~1.2V
Replies: 49
Views: 3361

Re: Voltage with level shifter ~1.2V

Hi Paul, at first, I'd like you to know that I really am very thankful for all the help! The white wire was connected to pin 1, the SCL and SDA are connected to pin 5 and 3. I made a new video, where I removed all the unnecessary wiring on the Pi itself. Check it here: http://www.youtube.com/watch?v...
by chrney
Mon Nov 05, 2012 4:39 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Voltage with level shifter ~1.2V
Replies: 49
Views: 3361

Re: Voltage with level shifter ~1.2V

http://i.imgur.com/u9psY.jpg = updated drawing. Sorry for the confusion in the prior drawing. http://www.lottastaxi.com/movie.MOV = movie with actual wiring. I hope you can see anything. It was the best way of illustrating this. It's just like I have the wiring on the drawing above. It's 4.3 meg, th...
by chrney
Sun Nov 04, 2012 8:43 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Voltage with level shifter ~1.2V
Replies: 49
Views: 3361

Re: Voltage with level shifter ~1.2V

It is connected to pin 6, not 8, thats a mistake in the diagram.

I connected the four wires to the I2c-backboard, GND, VCC, and the two that started with S. Nothing to the 16 pins on the LCD itself.
by chrney
Sun Nov 04, 2012 8:17 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Voltage with level shifter ~1.2V
Replies: 49
Views: 3361

Re: Voltage with level shifter ~1.2V

Found the level shifter, replaced here:

http://i.imgur.com/eKe1M.png

LCD's I²C from left to right: GND, VCC, SCL, SDA.
by chrney
Sun Nov 04, 2012 8:06 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Voltage with level shifter ~1.2V
Replies: 49
Views: 3361

Re: Voltage with level shifter ~1.2V

Rev 1, no mounting holes, black audio-connector (the rev2 seem to have a light blue one).

The level shifter is not alike, that's true - I simply could not find this in a Fritzing library. I hope you get the point anyway.

It still crashes, when I try with i2cdetect -y 1.
by chrney
Sun Nov 04, 2012 6:45 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Voltage with level shifter ~1.2V
Replies: 49
Views: 3361

Re: Voltage with level shifter ~1.2V

I tried to get a picture, but's it's really difficult to make it clear. Instead, I used Fritzing, hope this is okay as well: http://i.imgur.com/pYRZ5.png The four connectors on the LCD are actually those from the I2C-"board", which is soldered to the display itself, as seen in the eBay-link above. B...
by chrney
Sun Nov 04, 2012 11:52 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Voltage with level shifter ~1.2V
Replies: 49
Views: 3361

Re: Voltage with level shifter ~1.2V

Just double checked this you have another fault somewhere if i2cdetect -y 1 crahses system, check your board for debris (top and bottom), check your power rail (TP1 and TP2) something else is wrong. Looks just fine to me, unplugged and reassabled the whole case. Still the same issue :(. Have you go...
by chrney
Sat Nov 03, 2012 3:07 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Voltage with level shifter ~1.2V
Replies: 49
Views: 3361

Re: Voltage with level shifter ~1.2V

Thanks again!

Could I give it a try without the level shifter, to connect the 5v, pin 3 & 5 and GND to the LCD and run i2cdetect? Or would that blow up the board?

Yes, the computer is stuck, only thing that helps is to pull the plug when checking with i2cdetect -y 1.
by chrney
Sat Nov 03, 2012 1:33 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Voltage with level shifter ~1.2V
Replies: 49
Views: 3361

Re: Voltage with level shifter ~1.2V

So, in this case I use the two pins below 3v3, right? Pin 3 and 5, that is?
by chrney
Sat Nov 03, 2012 9:36 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Voltage with level shifter ~1.2V
Replies: 49
Views: 3361

Re: Voltage with level shifter ~1.2V

I use ic2detect -y 0 (the other one always hangs my Pi).
by chrney
Fri Nov 02, 2012 6:57 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Voltage with level shifter ~1.2V
Replies: 49
Views: 3361

Re: Voltage with level shifter ~1.2V

I tried this, and all the three pins of the LCD (VCC, SDA, SCL) are ~4.5V. Nevertheless, I cannot find the device using i2cdetect (I can find other devices with this command, so there's no problem there, I'd assume). This is my setup: RPi 5v -> Level Shifter HV + Resistor 4k7 no. 1 + Resistor 4k7 no...
by chrney
Fri Nov 02, 2012 1:25 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Voltage with level shifter ~1.2V
Replies: 49
Views: 3361

Re: Voltage with level shifter ~1.2V

Alright. Will head home and give it a try. Thanks, again.

http://www.doctormonk.com/2012/08/led-c ... ry-pi.html uses a similar approach I just saw.
by chrney
Fri Nov 02, 2012 12:57 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Voltage with level shifter ~1.2V
Replies: 49
Views: 3361

Re: Voltage with level shifter ~1.2V

thanks, will give that a try. From level shifter HV pin to the LCD's VCC then?
by chrney
Fri Nov 02, 2012 9:02 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Voltage with level shifter ~1.2V
Replies: 49
Views: 3361

Re: Voltage with level shifter ~1.2V

Alright. I tried that, but cannot detect the device with i2cdetect. Other i2c-device work well, so it's more the display. This is my setup until now: From RPi 5v [pin 2] to: a) 4k7-resistor 1, b) 4k7-resistor 2, c) LCD's VCC From RPi GND [pin 6] to: level shifter GND one side. From level shifter GND...
by chrney
Fri Nov 02, 2012 4:54 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Voltage with level shifter ~1.2V
Replies: 49
Views: 3361

Re: Voltage with level shifter ~1.2V

Thanks a lot Mike!

One last thing, on what side of the level shifter do I put the resistors? HV?

Cheers,

Christoph
by chrney
Thu Nov 01, 2012 7:24 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Voltage with level shifter ~1.2V
Replies: 49
Views: 3361

Re: Voltage with level shifter ~1.2V

malakai wrote:Here's the tutorial for a normal adafruit 16x2 display.
What link were you refering to, raspians.com?

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