Here is the cleaned up schematic for the compressor iot PCB.

At MacroFab we have a large industrial air compressor that provides compressed air to our pick and place and various machines.  I want to monitor the compressors pressure and run time to help influence the maintenance schedule for it.

Stephen and I talked about the Compressor IoT project on the following Podcasts: MEP EP#68, MEP EP#70, and MEP EP#74.

Compressor IoT part list

• LSM9DS1
  • IMU for vibration sensing
  • iNEMO inertial module: 3D accelerometer, 3D gyroscope, 3D magnetometer
  • 3.3V, I2C
• SPU0410HR5H-PB
  • MEMS Microphone
  • 3.3V
  • Analog signal, will be boosted with an opamp
• TMP102
  • Board Mount Temperature Sensors Low Power Digital Temp Sensor
  • 3.3V, I2C
• Ebay Pressure Transducer
  • 1/8″ NPT Male fitting
  • 5.0V
  • Analog output 0.5V – 4.5V over pressure range
• 6225AXXSZS-DC3
  • SSR to control the compressor switch
  • 3VDC to 32VDC control signal
  • Place 10ohm in series from pin from particle photon for protection.
  • TVS 3.3V for transient protection.
• 1591XXSFLBK
  • Enclosure with flange
• Particle Photon
  • IoT platform

You  can find the files on my github.