Quantity   Component name
1 × Particle Photon
4 × 50kg Load Cells per Keg/CO2 Tank Set of 4 per Keg/CO2 Tank scale
1 × Wire I’ve begun using 4-wire phone cable for all of my electronics projects due to cost, availability and ease of organization when they’re kept in the insulated sleeve. For this particular project I ended up using doorbell wire initially because that’s what I had lying around.
1 × Screw Terminals For connecting the wire to the board.
1 × Large PCB Prototype Board For the main board
1 × Small PCB Prototype Board For the pressure sensor
1 × Power supply I used 2, an existing one for the LED lights that I also used to power the solenoids and another one for the monitor
1 × 3D-Printed Components
1 × HX711 Load Cell Amplifier 1 per Keg/CO2 Tank scale
1 × Honeywell TruStability® Board Mount Pressure Sensor Model#: SSC D AN N 060PG A A 5 They make lots of similar sensors and any could work, this just happened to be the cheapest.
2 × TIP120-R Transistor 1 for the solenoid valves and 1 for the lights/monitor
2 × Resistor Size isn't real important, need 1 for the solenoid valves and 1 for the lights/monitor.
1 × DC 12V Normally Closed Solenoid Valve Need 1 per tap
1 × 1N4001 Flyback Diode For the transistor controlling the solenoid valves
1 × TMP36 Temperature Sensor
1 × M2x7mm Screws 8 for each of the enclosures, 4 for each of the scales