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ByteYourLife
Posts: 75
Joined: Wed Jul 23, 2014 3:04 am
Location: Germany
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7" touchscreen I2C address problem

Tue Jul 11, 2017 6:05 pm

Hello,
I bought one of the official Raspberry Pi touchscreens and connected it my Raspberry Pi 3 Model B.
I installed the latest Raspbian OS und updated the OS.

The I2C wires (SDA SCL) are connected as well the 5V and GND wires. Nothing else is connected to the I2C bus.

But if I execute the command "sudo i2cdetect -y 1" I get many different I2C address displayed which are jumping and changing.
The result from "sudo i2cdetect -y 1" looks like the picture below:

Image

This is the output from the picture:

Code: Select all

[email protected]:~ $ sudo i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f
10: 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
20: 20 21 22 23 24 25 26 -- -- 29 2a 2b 2c 2d 2e 2f
30: 30 31 32 33 34 35 36 37 -- -- 3a 3b 3c 3d 3e 3f
40: 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f
50: 50 51 52 53 54 55 56 57 58 59 5a 5b 5c -- -- 5f
60: 60 61 62 63 64 65 66 67 68 69 6a 6b 6c 6d 6e 6f
70: 70 71 -- -- 74 75 76 77
[email protected]:~ $ sudo i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          03 04 05 06 07 08 09 0a 0b 0c 0d -- --
10: 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
20: 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f
30: 30 31 32 33 34 35 36 37 38 39 3a 3b 3c 3d 3e 3f
40: 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f
50: 50 51 52 53 54 55 56 57 58 59 5a 5b 5c 5d 5e 5f
60: 60 61 62 63 64 65 66 67 68 69 6a 6b 6c 6d 6e 6f
70: 70 71 72 -- -- 75 76 77
[email protected]:~ $ sudo i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f
10: 10 11 12 13 14 15 16 17 18 19 1a -- -- 1d 1e 1f
20: 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f
30: 30 31 32 33 34 35 36 37 38 39 3a 3b 3c 3d 3e 3f
40: 40 41 42 43 44 45 -- -- 48 49 4a 4b 4c 4d 4e 4f
50: 50 51 52 53 54 55 56 57 58 -- -- 5b 5c 5d 5e 5f
60: 60 61 62 63 64 65 66 67 68 69 6a 6b 6c 6d 6e 6f
70: 70 71 72 73 74 75 76 77
[email protected]:~ $
Does any one has seen the same problem and know how to fix it or what the problem is?

Any help is highly appreciated.

ByteYourLife
My project I am working on: An autonomous driving car with the Raspberry Pi and a lot of sensors.

6by9
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
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Re: 7" touchscreen I2C address problem

Tue Jul 11, 2017 7:14 pm

Disconnect the i2c wires. They are only needed on Pi 1 models a and B. All other models have i2c already wired up the flexi cable.
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User avatar
ByteYourLife
Posts: 75
Joined: Wed Jul 23, 2014 3:04 am
Location: Germany
Contact: Website

Re: 7" touchscreen I2C address problem

Tue Jul 11, 2017 8:26 pm

Thank you very much 6by9 for your fast help.
You are right now everything is working fine.
Thank you very much!
My project I am working on: An autonomous driving car with the Raspberry Pi and a lot of sensors.

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