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.
Pinout
- AOfficial table 2 row 1
Trigger End A / Provide the pulse with a width of more than 2ms to reverse relay state
Type · GPIO - +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 · GPIO - +Official table 2 row 5
Positive / 3.3V-5V
Type · Power - -Official table 2 row 6
Negative /
Type · Ground - AOfficial table 2 row 7
Relay Contact A /
Type · Unknown - COMOfficial table 2 row 8
Relay Common end /
Type · Unknown - BOfficial table 2 row 9
Relay Contact B /
Type · Unknown
| Pin | Position | Type | Function |
|---|---|---|---|
| A | Official table 2 row 1 | GPIO | 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 | GPIO | 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 | Unknown | Relay Contact A / |
| COM | Official table 2 row 8 | Unknown | Relay Common end / |
| B | Official table 2 row 9 | Unknown | Relay Contact B / |
Pin details
9 connections- AOfficial table 2 row 1
Trigger End A / Provide the pulse with a width of more than 2ms to reverse relay state
GPIO - +Official table 2 row 2
Positive / 3.3V-5V
Power - -Official table 2 row 3
Negative /
Ground - BOfficial table 2 row 4
Trigger End B / Provide the pulse with a width of more than 2ms to reverse relay state
GPIO - +Official table 2 row 5
Positive / 3.3V-5V
Power - -Official table 2 row 6
Negative /
Ground - AOfficial table 2 row 7
Relay Contact A /
Unknown - COMOfficial table 2 row 8
Relay Common end /
Unknown - BOfficial table 2 row 9
Relay Contact B /
Unknown
Relays
46 other optionsGravity 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.
16-Ch Ethernet Relay Module, Modbus RTU / Modbus TCP Protocol, Ethernet Port Communication, Supports PoE Power Supply, With Various Isolation And Protection Circuits visual preview16-Ch Ethernet Relay Module, Modbus RTU / Modbus TCP Protocol, Ethernet Port Communication, Supports PoE Power Supply, With Various Isolation And Protection Circuits
2-Channel SPST Relay Unit visual preview2-Channel SPST Relay Unit
315MHz Codec-Adaptive Wireless Relay visual preview315MHz Codec-Adaptive Wireless Relay
315MHz Remote Relay Switch Kit - 2 Channels visual preview315MHz Remote Relay Switch Kit - 2 Channels
315MHz Wireless Car Key Fob with Key Chain (battery included) visual preview315MHz Wireless Car Key Fob with Key Chain (battery included)
4-Ch Modbus RTU Relay Module, RS485, 30A visual preview4-Ch Modbus RTU Relay Module, RS485, 30A
4-Relay Unit visual preview4-Relay Unit
433MHz Codec-Adaptive Wireless Relay visual preview433MHz Codec-Adaptive Wireless Relay
8 Channel Relay Module (RJ45-RLY16, Up to 16A) visual preview8 Channel Relay Module (RJ45-RLY16, Up to 16A)
8-Ch Dual-Ethernet Relay Module (C), Modbus RTU, PoE visual preview8-Ch Dual-Ethernet Relay Module (C), Modbus RTU, PoE
8-Ch Ethernet Relay Module (B) with Digital Input, Modbus RTU/TCP, PoE visual preview8-Ch Ethernet Relay Module (B) with Digital Input, Modbus RTU/TCP, PoE
8-ch Ethernet Relay Module, Modbus RTU/Modbus TCP Protocol, PoE port Communication, With Various Isolation And Protection Circuits visual preview8-ch Ethernet Relay Module, Modbus RTU/Modbus TCP Protocol, PoE port Communication, With Various Isolation And Protection Circuits
Related groups
4 groups
10W Super Bright LED - Violet visual previewLED pixels
WS2812/SK6812 NeoPixel strips, rings and Jewels, APA102 DotStar pixels, and plain analog RGB strips — each matched to its protocol and host, not just its connector.
Components · Addressable LEDs · 180 parts
18-Channel 8-bit PWM LED Driver w/ I2C Interface visual previewBare 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.
Components · Integrated circuits · 68 parts
10-bit ADC (SPI) visual previewConverters
ADS1115/MCP3421 ADCs, MCP4725 and GP8413 DACs, CP2102 USB-UART boards, and I2C plumbing like the LTC4316 address shifter — matched to bus, resolution and signal range.
Components · Interface converters · 114 parts
256MB Micro SD Memory Card visual previewMemory
24LC32/25LC256 EEPROM, I2C FRAM, 64Mbit PSRAM, and microSD breakouts up to 64GB — matched to write frequency and data volume, not just interface.
Components · Memory & storage · 39 parts