Component list
Component list
Resistors
R5* = 1k2
R6 = 270 Ω
Semiconductors
D2* = red LED
D3, D3’ = white LED (see text)
D4* = not mounted (or remove from relay board)
Q1* = BC550
U1 = Hall sensor A1302 or A1308 (Allegro) or SS49E (Honeywell)
Miscellaneous
5V relay board *
MOD1 = M5Stack ATOM Lite or M5Stack ATOM Matrix
Neodymium disk magnets
*= see [1] for the details on the electromagnet/relay board
Additional parts needed for analog adjustment:
Resistors
R1 = 4k7
RV1 = 5 k trimmer
Capacitors
C1 = 10 µF, 10 V radial
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