Interfacing (DSI, CSI, I2C, etc.) • MCP23017 E/SP does not show in i2cdetect

Hello,

I've been using my MCP23017 in my test project for a few weeks now. However, it suddenly stopped working today. When I run `i2cdetect -y 1`, I get the following output:

chris@raspberrypi:~ $ i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

I already had a similar problem (viewtopic.php?p=2211676) which resolved itself very quickly. There my i2c didn't work at all but now other i2c devices work only the MCP23017 doesn't.

I've attached a image of my wiring:

- White: Ground
- Black: 3.3V
- Red: SDA
- Blue: SCL

Please advise on how to troubleshoot and resolve this issue.

Best regards,

Chris

Statistics: Posted by skiddybison5924 — Tue May 21, 2024 6:52 pm

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