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Article

Magnetic Levitation the Digital Way

ESP32 Pico Replaces the Analog Comparator

Magnetic Levitation the Digital Way
Magnetic Levitation the Digital Way
In the article “Magnetic Levitation the Easy Way,” we saw that magnetic levitation isn’t too difficult to achieve with a permanent magnet, the coil and core of a standard 5 V relay, a Hall sensor and a good-old analog comparator. In this second project, an ESP32 Pico SoC is in control, integrated in the handy M5Stack ATOM.
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Materials

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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