Gravity: Magnetic Latching Relay for ESP32 / Arduino

Magnetic latching relay that retains its state without continuous power, reducing energy use and operating noise. Compatible with ESP32, Arduino, and similar microcontrollers.

AOfficial table 2 row 1
Trigger End A / Provide the pulse with a width of more than 2ms to reverse relay state
Type · digital io
+Official table 2 row 2
Positive / 3.3V-5V
Type · power
-Official table 2 row 3
Negative /
Type · ground
BOfficial table 2 row 4
Trigger End B / Provide the pulse with a width of more than 2ms to reverse relay state
Type · digital io
+Official table 2 row 5
Positive / 3.3V-5V

Relays

43 other options

Gravity and Grove single-relay modules, Pi relay HATs, USB-RLY16 boards, Sonoff Wi-Fi smart switches, and Waveshare Modbus RTU/TCP industrial modules — matched by control interface and contact rating.

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Related groups

4 groups

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Bare ICs

74HC logic gates, MCP3008/MCP23017 ADCs and expanders, 24LC256 EEPROM, 4N25-series optocouplers and ULN2803A drivers — bare DIP chips with no breakout-board conveniences like pull-ups or level shifting.

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Converters

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Memory

24LC32/25LC256 EEPROM, I2C FRAM, 64Mbit PSRAM, and microSD breakouts up to 64GB — matched to write frequency and data volume, not just interface.

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Pin	Position	Type	Function
A	Official table 2 row 1	digital io	Trigger End A / Provide the pulse with a width of more than 2ms to reverse relay state
+	Official table 2 row 2	power	Positive / 3.3V-5V
-	Official table 2 row 3	ground	Negative /
B	Official table 2 row 4	digital io	Trigger End B / Provide the pulse with a width of more than 2ms to reverse relay state
+	Official table 2 row 5	power	Positive / 3.3V-5V
-	Official table 2 row 6	ground	Negative /
A	Official table 2 row 7	pin	Relay Contact A /
COM	Official table 2 row 8	pin	Relay Common end /
B	Official table 2 row 9	pin	Relay Contact B /

Pinout

LED pixels

Bare ICs

Converters

Memory