// other
Reed Switch
Magnetic contact switch
€1.00
avg eur
Digital
Pins
2
Specs
3
Libraries
1
Protocols
1
// wiring → esp32 devkit v1
3V3
EN
GPIO36
VP
GPIO39
VN
GPIO34
GPIO35
GPIO32
GPIO33
GPIO25
GPIO26
GPIO27
Leg A
GPIO14
GPIO12
Leg B
GND
GPIO13
ESP32
WROOM-32
devkit v1
USB
VIN
5V
GND
GPIO23
GPIO22
SCL
GPIO1
TX0
GPIO3
RX0
GPIO21
SDA
GPIO19
MISO
GPIO18
SCK
GPIO5
SS
GPIO17
TX2
GPIO16
RX2
GPIO4
GPIO2
GPIO15
sensor pin (left)
sensor pin (right)
unused
// pinout → esp32
| Sensor Pin | ESP32 Connection |
|---|---|
| Leg A | GPIO 14 (INPUT_PULLUP) |
| Leg B | GND |
// technical specs
Type
Normally open
Activation
~10–15 mm magnet
Voltage
any (passive)
// github libraries
// notes & warnings
Passive — no power needed. Use INPUT_PULLUP. Standard for door/window security.
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Submitted by caio.ricciuti@outlook.com
· Apr 26, 2026