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Topic starter
2024-04-27 7:51 pm
sudo i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- 24 25 26 27 -- -- -- -- -- -- -- 2f
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 3f
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
The RPi 4B see the four LCD screen 24-27 and Two Mega 2F and 3F correctly for about a minute. Then one of the LCD screen goes black and then
sudo i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: 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 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 73 74 75 76 77
When I connect them to the Bi-Directional Logic Level Converter, it sees none of the devices on the Arduino 5V side. I can connect a single Mega to the I2C on the 3.3V side and it detects it. Do they make an I2C Extender?
2024-04-27 8:55 pm
@scsiraidguru Do you mean a
TCA9548A I2C Multiplexer?
First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
My personal scorecard is now 1 PC hardware fix (circa 1982), 1 open source fix (at age 82), and 2 zero day bugs in a major OS.
2024-04-27 8:59 pm
@scsiraidguru As far as the 'black' screen and the detect going crazy, maybe one of the many connections on all those breadboard wiggled loose? Do you have the good boards made by BusBoard Prototype Systems?
First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
My personal scorecard is now 1 PC hardware fix (circa 1982), 1 open source fix (at age 82), and 2 zero day bugs in a major OS.
Topic starter
2024-04-27 10:48 pm
I did consider replacing my breadboards. Those are a good brand
Topic starter
2024-04-27 10:48 pm
Adafruit LTC4311 I2C Extender / Active Terminator - STEMMA QT / Qwiic
Product ID: 4756
2024-04-28 12:40 am
@scsiraidguru After reading a review I tried them and then threw out all my old boards and replaced them with those. I used to have constant problems with bad connections.
I also bought all new silicone jumper wires. A lot of the cheaper wires have poor quality wire to ending connections.
My time is far more valuable than the few dollars the new parts cost.
First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
My personal scorecard is now 1 PC hardware fix (circa 1982), 1 open source fix (at age 82), and 2 zero day bugs in a major OS.
Topic starter
2024-04-28 10:45 am
@zander I will look at getting them. I have had many of those boards for 10+ years. Lately, I hot glue them down instead of pulling the tape. I want to get a 12V bench power supply. Siglent has good products and support. My scope is a Siglent 4 channel.
Topic starter
2024-04-28 11:05 am
https://siglentna.com/power-supplies/spd3303c-series-programmable-dc-power-supply/
SPD3303C: two channels 0-32V 0-3.2A, one channel 2.5,3.3, 5V @ 3.2A $299
I can power up Vin to 12V.
Those breadboards can do 36V @ 2A.
2024-04-28 12:27 pm
@scsiraidguru Mine are just loose, I only use a breadboard to quickly set up and test a circuit before committing it to some sort of permanent board.
First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
My personal scorecard is now 1 PC hardware fix (circa 1982), 1 open source fix (at age 82), and 2 zero day bugs in a major OS.
Topic starter
2024-04-28 12:28 pm
I thought about building something permanent. I want to find I2C daisy chain cables.
Topic starter
2024-04-28 12:33 pm
Topic starter
2024-04-29 4:50 pm
QWIIC Star Sparkfun $3.47
five I2C devices connected together
2024-04-29 5:15 pm
@scsiraidguru Yes, but I don't need anything to do that, you only need that if you choose to use the expensive QWIIC connectors. I do NOT own any, and doubt I ever will.
First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
My personal scorecard is now 1 PC hardware fix (circa 1982), 1 open source fix (at age 82), and 2 zero day bugs in a major OS.
Topic starter
2024-04-29 5:22 pm
@zander I plan on buying QWIIC sensors. I bought 4 of them and the cables. 127 devices on the bus. Multiple I2C buses available on Arduino and RPi.
2024-04-29 7:27 pm
@scsiraidguru Woohoo, deep pockets.
First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
My personal scorecard is now 1 PC hardware fix (circa 1982), 1 open source fix (at age 82), and 2 zero day bugs in a major OS.
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