1. Tomy baby monitor - transmitter and aerial
2. Wireless router - backup transmitter and aerial
3. Mercury thermometer - temperature sensor
4. x4 large batteries - power supply
5. Balloon - pressure sensor (expands and pops if case punctured)
6. Power-pack - backup power supply
7. Domestic thermostat - activates fan and changes radio signal
8. Battery powered fan - moves heat to casing (once tin lid is on)
9. Biscuit tin with foil - houses components and reflects solar radiation
The BBC helpfully provides more information here.
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