Quantity   Component name
1 × Raspberry Pi Zero £4 from the Pi Hut
1 × Pimoroni - EnvironpHat Pi hat, giving analogue inputs and motions, Gauss measurements (electonic compass) (£15)
1 × Box to hold pi & hat ABS box c30mm x 70mm x 55mm or simliar
1 × Power Supply converter: 12v to 5v at 1amp. Will feed the project via 12v recvhargeable, so need a converter to run Raspi
1 × 12v rechrageable cell prefer LiPo cell, but safer to use lead acid. Needs enough to drive a shutter mechanism for 2 mins and the pi for some 5 hours. guess at 35Ahr. Needs to work in low temperatures
1 × Motor and Gear box to operate a 7Nm load. 12v motor.
1 × I2C motor controller unit used to lik the Pi with the 12volt motors and end stop switches.