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DIN Rail Mount MCP23017 32 Channel GPIO Expander with I2C Interface for Arduino Raspberry Pi, 3.3V/5V Power|Demo Board Accessories| - AliExpress
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Amazon.com: Pzsmocn 8-Bit Level Shift Board Compatible with Arduino and Raspberry Pi. 1.2V/1.8V/2.5V/3.3V/5V Bidirectional Conversion, Push-Pull 60Mbps Open-Drain 2Mbps(MAX), for I2C, UART, SPI, OneWire, etc. : Electronics
![switches - Control 5 V load with transistor 3.3 V - Raspberry Pi - Electrical Engineering Stack Exchange switches - Control 5 V load with transistor 3.3 V - Raspberry Pi - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/S1NUbm.png)