Parts

2 x Adafruit Feather nRF52840 Express
CircuitPython compatible Feather with Bluetooth Low Energy and native USB
1 x Mini Push-Pull Solenoid - 5V
Very small 20mm long solenoid with a captive armature and a return spring
1 x N-channel power MOSFET - 30V / 60A
IRLB8721 logic level MOSFET
1 x 10K Ω Resistor
Through-hole resistor 1/4 watt 5%
1 x 1N4001 Diode
Kickback protection diode
1 x Lithium Ion Polymer Battery
Ideal battery for Feathers - 3.7V 400mAh
1 x Switch
Mini slide or rocker switch
1 x Green LED
HLMP-CM1G-350DD 525nm 15° water clear lens
1 x Light Tube
2mm single strand end glow fiber optic filament
1 x 15M Ω Resistor
Through-hole resistor 1/4 watt 5%
1 x 82nF Ceramic Capacitor
Filtering capacitor 10V or higher
2 x Steel Threaded Rods
M5 x 250mm Fully Threaded
4 x Steel Nuts
M5 hex
1 x Nylon Screw
M3 x 8mm socket head
1 x Nylon Spacer Standoff
M3 x 6mm (cut to length)
This guide was first published on Oct 16, 2019. It was last updated on Oct 16, 2019. This page (Parts) was last updated on Nov 17, 2019.