Bill of Materials
The following page shows the Bill of Materials for the project. All prices are accurate at the time of order. Please note this excludes the cost of PCB manufacturing and enclosure materials.
| Component | Unit Price (£) |
Units | Total Cost (£) |
Link |
|---|---|---|---|---|
| Pipe Coupler | 1.27 | 1 | 1.27 | Link |
| Food Storage Canisters | 2.5 | 1 | 2.5 | Link |
| Clear Unreinforced PVC Tubing | 2.03 | 1 | 2.03 | Link |
| RS PRO Straight Brass Hose Connector 1/4 in G Male |
1.66* | 3 | 4.98* | Link |
| Electric Kettle | 9.99 | 1 | 9.99 | Link |
| 620mOhm 0805 SMD Resistor ±1% 0.125W | 0.065* | 10 | 0.65* | Link |
| TI DRV8825PWP Stepper Motor Driver IC | 3.59* | 1 | 3.59* | Link |
| 12V Solenoid Valve 1/4 Port | 8.8* | 2 | 17.6* | Link |
| Safety Capacitors .01uF 480Vac 20% | 0.29* | 1 | 0.29* | Link |
| 39Ohm 1W Metal Oxide Resistor ±5% | 0.021* | 10 | 0.21* | Link |
| MOC3061M AC Input Triac Output Optocoupler | 0.58* | 5 | 2.9* | Link |
| BTA26-600BRG 25A 600V TRIAC | 3.04* | 1 | 3.04* | Link |
| 390Ohm 1W Metal Oxide Resistor ±5% | 0.067* | 10 | 0.67* | Link |
| Heatsink 4K/W 50.8 x 42 x 25mm Clip | 3.03* | 1 | 3.03* | Link |
| DS18B20 Digital Temp. Sensor | 5.34 | 1 | 5.34 | Link |
| Total: | 58.09 |
- Some components (e.g. resistors) have minimum order quantities and therefore more than are actually used in the project have been ordered. Finding alternative suppliers for the parts can help reducing the final costs.
- Prices indicated with an asterisk (*) do not include VAT.
As this project is done within the University of Glasgow, some components were provided by the university, or are second-hand parts from other projects. These are shown in the table below.
| Component | Unit Price (£) |
Units | Total Cost (£) |
Link |
|---|---|---|---|---|
| Raspberry Pi 3 Model B SBC | 28.39 | 1 | 28.39 | Link |
| Stepper Motor | 26.24 | 1 | 26.24 | Link |
| 330Ohm 0.6 Watt +/- 1% Resistor | 0.03 | 1 | 0.03 | |
| 360Ohm 0.6 Watt +/- 1% Resistor | 0.03 | 1 | 0.03 | |
| 120Ohm 0.6 Watt +/- 1% Resistor | 0.03 | 1 | 0.03 | |
| 270Ohm 0.6 Watt +/- 1% Resistor | 0.03 | 2 | 0.06 | |
| 270Ohm SMD 0805 Resistor | 1 | |||
| 10K SMD 0805 Resistor | 2 | |||
| 10K SMD 0805 Resistor | 5 | |||
| 1Meg SMD 0805 Resistor | 1 | |||
| 1K SMED 0805 Resistor | 2 | |||
| Molex Conn. 01x02 Housing | 0.01 | 4 | 0.04 | Link |
| Molex Conn. 01x02 Header | 0.022 | 4 | 0.088 | Link |
| Molex Conn. 01x03 Housing | 3 | 0.014 | 0.042 | Link |
| Molex Conn. 01x03 Header | 3 | 0.032 | 0.096 | Link |
| Molex Conn. 01x04 Housing | 2 | 0.019 | 0.038 | Link |
| Molex Conn. 01x04 Header | 2 | 0.042 | 0.084 | Link |
| Molex Conn. 01x08 Housing | 1 | 0.035 | 0.035 | Link |
| Molex Conn. 01x08 Header | 1 | 0.085 | 0.085 | Link |
| Barrel Jack Conn. | 0.13 | 2 | 0.26 | Link |
| Pin Header 02x20 | 1 | |||
| LED 3mm | 0.11 | 3 | 0.33 | Link |
| 1N4148 Shottky Diode | 0.005 | 2 | 0.01 | Link |
| N-MOSFET | 0.67 | 1 | 0.67 | Link |
| 0.01uF SMD 0603 Capacitor | 1 | |||
| 0.1uF SMD 0805 Capacitor | 3 | |||
| 0.47uF SMD 1206 Capacitor | 1 | |||
| 100uF SMD Elec. Capacitor | 1 | |||
| SPDT Switch | 1 | |||
| Estimated Total: | 56.56 |
- The cost of some components could not be found, however it will not make a significant difference to the total.
