| E1 | MLX90640BAB 32 × 24 thermal camera, 55° × 35° FOV (STEMMA QT/Qwiic) Adafruit PID 4407 (55°); datasheet: ±1 °C frame accuracy + ±1 °C non-uniformity (centre zone), NETD 0.25 K at 1 Hz | 1 | $74.95 | $74.95 | adafruit.com Adafruit $74.95 · checked 2026-10-09 · Out of stock (re-checked 2026-10-09 17:02 CT); re-check before ordering | Pimoroni PIM365 MLX90640 55°, £40.00 (pimoroni.com, in stock 2026-10-09; UK, import; 0.1 in header, needs jumper wires or a Qwiic adapter cable, check the M2.5 hole pattern). SparkFun SEN-14844 is retired (product page, 2026-10-09). Adafruit AMG8833 8 × 8 PID 3538 $44.95 (low total; too coarse for the bar profile — use probes for Lab 3) | — |
| E2 | ESP32 Feather V2 Adafruit PID 5400 | 1 | $19.95 | $19.95 | adafruit.com Adafruit $19.95 · checked 2026-10-09 · In stock | Any ESP32 board with I²C (pin numbers change) | Header soldering (supervised) |
| E3 | INA219 current/voltage sensor (heater power) Adafruit PID 904 · in the heater's + lead; 32 V / 1 A calibration | 1 | $9.95 | $9.95 | adafruit.com Adafruit $9.95 · checked 2026-10-09 · In stock | USB-style inline power meter (manual readings) | — |
| E4 | DS18B20 waterproof temperature probe Adafruit PID 381 · ±0.5 °C (Maxim datasheet, −10…85 °C); 4.7 kΩ pull-up included per listing | 3 | $9.95 | $29.85 | adafruit.com Adafruit $9.95 · checked 2026-10-09 · In stock | 2 probes (heater + one coupon) — the heater probe is required for the safety trip | — |
| E5 | MOSFET driver, STEMMA JST PH Adafruit PID 5648 · 3–30 V load, 1.5 A continuous (vendor); switches the heating pad | 1 | $3.95 | $3.95 | adafruit.com Adafruit $3.95 · checked 2026-10-09 · In stock | Logic-level N-MOSFET (Adafruit PID 355, $2.25, out of stock 2026-10-09) + 10 kΩ gate pull-down | — |
| E6 | JST PH 3-pin to male header cable (MOSFET driver signal) Adafruit PID 3893, 200 mm | 1 | $1.25 | $1.25 | adafruit.com Adafruit $1.25 · checked 2026-10-09 · Out of stock on 2026-10-09 | Jumper wires pushed into the JST housing, or solder to the driver's header pads (low total) | — |
| E7 | STEMMA QT / Qwiic cable 300 mm (INA219 → camera) Adafruit PID 5384 | 1 | $1.25 | $1.25 | adafruit.com Adafruit $1.25 · checked 2026-10-09 · Not recorded (page showed mixed stock labels) | 200 mm PID 4401 $1.25 with the INA219 mounted higher | — |
| E8 | STEMMA QT / Qwiic cable 100 mm (Feather → INA219) Adafruit PID 4210 | 1 | $0.95 | $0.95 | adafruit.com Adafruit $0.95 · checked 2026-10-09 · Not recorded (page showed mixed stock labels) | — | — |
| E9 | Hook-up wire 22 AWG solid (6 × 25 ft) Adafruit PID 1311 | 1 | $15.95 | $15.95 | adafruit.com Adafruit $15.95 · checked 2026-10-09 · In stock | Any 22–26 AWG wire (low total assumes owned) | — |
| E10 | USB-A to USB-C data cable Adafruit PID 4474 | 1 | $4.95 | $4.95 | adafruit.com Adafruit $4.95 · checked 2026-10-09 · In stock | Any USB-C data cable | — |
| Subtotal | $163.00 | Low-cost path: $110.85 |