I have two LED devices https://www.amazon.com/Adafruit-4-digit-7-segment-Display-Backpack/dp/B00GJRQUTS/ref=as_li_ss_tl?ie=UTF8&qid=1472685782&sr=8-1&keywords=Adafruit+0.56"+4-Digit+7-Segment+Display+w/I2C+Backpack+-+Green&linkCode=sl1&tag=jetsonhacks-20&linkId=853c6bf8dba3d1667ca3732234b6f267 and
And would like to use Jetson Tx2 i2c cto drive it. I wired the 7 Seg LED to Bus 1
GND J21-6 -> LED Backpack (GND)
VCC J21-2 -> LED Backpack (VCC – 5V)
SDA J21-3 -> LED Backpack (SDA)
SCL J21-5 -> LED Backpack (SCL)
And I wired the 8x8 LED matrix to Bus 0
GND J21-30 -> LED Backpack (GND)
VCC J21-4 -> LED Backpack (VCC – 5V)
SDA J21-27 -> LED Backpack (SDA)
SCL J21-28 -> LED Backpack (SCL)
Inside my ros node, I used the driver code from here https://github.com/jetsonhacks/JHLEDBackpack I create two HT16K33, one used bus 1, the other used bus 0. Both use kI2CAddress 0x70.
This way, I found that I could run the two devices separately, but I could not run them at the same time.
Would you please let me know why? I can not sure if both can use the same kI2CAddress 0x70.