Table A1.
Parts list
| Quantity | Part | Purpose | Part Number | Cost |
|---|---|---|---|---|
| Detector | Total: $8–10 | |||
| 2 | Omron 4070 photosensor | Detection of licks | Mouser: 653-EE-SX4070 | $2.31 each |
| 1 | 3D-printed base | Positioning of sensors | not applicable | <$5 |
| 2 | 1/32″ silicone tubing | Delivery of water reward | US Plastic: 57286 | $1.15/ft |
| 1 | M3 steel dowel | Provide way to hold base | Mcmaster: 91595A140 | $0.36 each |
| Circuit (×2) | Total: $2.28 | |||
| 1 | 0.1 μF capacitor | Circuit components | Digikey: 311-1338-1-ND | $0.10 each |
| 1 | 270 Ω resistor | Digikey: 311-270JRCT-ND | $0.10 each | |
| 1 | 1 kΩ resistor | Digikey: 311-1.0KJRCT-ND | $0.10 each | |
| 1 | 8L05A voltage regulator | Mouser: 863-MC78L05ABDR2G | $0.46 each | |
| 1 | ES1A diode | Digikey: ES1AFSCT-ND | $0.38 each | |
| Recommended parts | Total: ~$45 | |||
| 2 | Female BNC connector | Output signal to BNC | E.g., Digikey: 314-1189-ND | $10.89 each |
| 2 | 2.5-mm barrel connector jack | Power the circuit | E.g., Digikey: EJ501A-ND | $2.70 each |
| 1 | 12-V power supply, barrel connector | E.g., Newark: 54X7759 | $15.05 each | |
| 14-gauge wires OR (optional) 8-wire Ethernet cable | Connect photosensors to circuit | E.g., Digikey: A541419B-100-ND | $0.41/ft | |
| (optional) RJ45 Ethernet jack, male and female | Make circuit and sensor modular | E.g., Digikey: 553–2274-1-ND | $0.97 each | |
| E.g., Digikey: AE10316-ND | $0.35 each | |||