TMC 2209 (x2)

1. short the circled two pads though soldering, this is for UART control of the driver
2. solder male headers
3. connect the 12V power to VM, adjust the pot to make V_ref approximately zero. this is to make sure the current to motor defaults to zero before setting it through UART
4. wiring - Arduino
   • driver 1
     • DIR: Arduino Due pin 28
     • STEP: Arduino Due pin 26
     • PDN/UART (pin 11 on silentstepstick): Arduino Due pin 14
     • VIO: 3.3 V
     • EN: GND
     • MS1/MS2: GND
   • driver 2
     • DIR: Arduino Due pin 24
     • STEP: Arduino Due pin 22
     • PDN/UART (pin 11 on silentstepstick): Arduino Due pin 14
     • VIO: 3.3 V
     • EN: GND
     • MS1/MS2: GND
5. wiring - motors (make sure only connect/disconnect motors when the power supply is off, otherwise the driver and the Arduino (if connected) will be damaged)
   • M1B: orange
   • M1A: yellow
   • M2A: brown
   • M2B: black

I2C mux

1. wiring
   • SDA (blue) : Arduino pin 20
   • SCL (yellow): Arduino pin 21
   • GND (black): Arduino GND
   • 3.3V (red): Arduino 3.3 V

SFM3000 (x2)

1. wiring
   • SFM3000 (air):
     • SDA: I2C mux port 0 SDA
     • GND: I2C mux port 0 GND
     • VDD: 5V
     • SCL: I2C mux port 0 SCL
   • SFM3000 (oxygen):
     • SDA: I2C mux port 1 SDA
     • GND: I2C port 1 GND
     • VDD: 5V
     • SCL: I2C mux port 1 SCL

SDP810 (x1)

1. wiring
   • SCL: Arduino pin 21
   • VDD: Arduino 3.3V
   • GND: Arduino GND
   • SDA: Arduino pin 20

ABP pressure sensors (x5)

1. sensor interface:
   • pin 1: GND
   • pin 2: VCC
   • pin 3: INT
   • pin 4: NC
   • pin 5: SDA
   • pin 6: SCL
2. wiring
   • 30 psi (pressure after the regulator for air): I2C mux port 2
   • 30 psi (pressure after the regulator for oxygen): I2C mux port 3
   • 5 or 1 psi (exhalation control valve pressure): I2C mux port 4
   • 5 or 1 psi ("patient" pressure): I2C mux port 5
   • 5 or 1 psi (airway pressure): I2C mux port 6