Hello,    Here is my answer.  Number is pin based on shuttle board.  (a) 1 - VCC, 2- VCCIO ( okay connect to 1), 3 - GND, 18 - I2C clock, 17 - I2C data 4 - GND, 7 - VCC.  You can also check BMP280 datasheet in page 35. (b) 1 - VCC, 2- VCCIO ( okay connect to 1), 3 - GND, 4- MISO, 5- MOSI, 6- CLK, 7- CSB pin from MCU ( Chip select ) (c) Shuttle board is our reference board, so all devices are compatible with shuttle board design.  That's why shuttle board has plenty of pins.And also we connect to shuttle board several pins from one chip set pin because of customer preference 🙂   Thanks,  ... View more

Hello hihith,    I found that your gas value didn't change at all.  It means that you don't get proper gas value.  IAQ should be generated when you can get gas value.  Could you upload your source code?  Thanks,    ... View more

Hello Jones,    I don't understand your reply fully.  I mean you enable x,y,z all axes and your threshold is 90mg.  Let's say if BMA400 is on your board. Z value should be around 1G right? ( Reversely -1 G)  Therefore, Z value is always over your threshold for your wake up threshold, so can't be reset.  To be specific, even though you reset mandatory, it will be set again right after.  Thanks,   ... View more

Please let me know if you have further questions 🙂   Thanks,  ... View more