i2c bus error with LED marix on RasPi

This is mostly for myself but I figured I would post it here as well. After putting together and setting up my new 8×8 bi-color LED matrix and i2c control PCB from Adafruit, I got a script error saying “Error accessing 0x70: Check your I2C address”. When I run sudo i2cdetect -y 0, I get nothing, but the matrix is detected when I run sudo i2cdetect -y 1.

So apparently the original version ran i2c on #0, but now it is on #1. So the test scripts are looking on the wrong bus for the device. Making a change to Adafruit_I2C.py to reflect the proper device bus should fix the issue… I guess I will find out tonight.

Original post text: Continue reading

ODROID mini Android based PCB.

This is rather cool it you are looking for a way to smarten up your regular TV with a fast mini Android PC. It is a bit pricey, but what really impressed me was some of the expansion options on the products page. Things like the eMMC Version 4.41 interface could come in really handy for high speed access to data through the micro SD slot for a Raspberry Pi or Arduino.

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