I was trying to connect 8 Qty SHT 85 humidity/temp I2C sensor to the multiplexer and then connect the multiplexer to NI 8451. However, I could never get more than 2 ports to work i...
JaneYu 2021-09-28 02:04:44 98 Views3 Replies I was trying to connect 8 Qty SHT 85 humidity/temp I2C sensor to the multiplexer and then connect the multiplexer to NI 8451. However, I could never get more than 2 ports to work ie 0 and 1. I have tried switching the pullup resistors (required for SHT 85 sensor), I have tried switching the sensors around, even connected an external 5V power supply. Nothing seems to work. All the combinations of sensors seems to work with just ports 0 an 1. I am really frustrated, not sure what I am missing here.Any suggestions here?
Hello,
What is the difference between this (Gravity: Digital 1-to-8 I2C Multiplexer) vs Gravity: I2C HUB?
What sort of application or situation each should be used for?
Thanks.
JaneYu Hello! Our arduino board needs us to place 2 pull-up resistors on the SDA SCL pins when communicating to our I2C device. How about this board?
Will we need to place pull ups in the output?
Thanks!
JaneYu I have figured this out. Please include in the manual that in order to access port 0 of multiplexer we should "write data" = 00000001 (ie. 0x1 Hex) and to access port 5 of multiplexer, we should "write data" = 00100000 (ie 0x20 Hex). I was writing just 1,2,3,4,5,6,7,8 and hence only only 1, 2 were working as they were the correct hex numbers. Please include this in the documentation.
JaneYu 
