Small single interface (I2C, SPI, whatever) multi gang environmental sensor:
- Barometric pressure, humidity, altitude, temp
- Complete 9 DOF IMU (accelerometer, magnetometer and gyroscope) with available post processing built in
- CO, O2, NH3, H2S, NO2, HF, SO2, CL2, O3, C2H4, CH3O, ETO, N2, HCL (Probably missed a few)
- Combustible Gas (all of the *tane's, *anol's, *tone's etc)
All with appropriate PPM/PPB where applicable.
Since I'm wishing let's toss in a ~1cm accurate > 50hz GPS, with external antenna port.
Something size suitable for IoT, phones, small robotics etc.