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4-CH Current/Voltage/Power Monitor HAT for Raspberry Pi 4B/3B+/3B/2B/B+/A+/ Zero/W, I2C/SMBus Interface Onboard 0.1O 1% Sampling Resistor Measure Bi-Directional Current up to 3.2A Embed 12-bit ADC - Newegg.com
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Amazon.com: Waveshare Serial Expansion HAT for Raspberry Pi Zero/Zero W/Zero WH/2B/3B/3B+ via I2C Interface 2-ch UART 8 GPIOs : Electronics
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Amazon.com: Servo Driver HAT Board for Raspberry Pi Zero/Zero W/Zero WH/2B/3B/3B+ 16-Channel Servo/PWM Outputs with I2C Interface Used for Controlling Robotic Arm or Hexapod Walker : Electronics
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Raspberry Pi Zero LCD Audio Player I2C I2S DAC Module Button Screen Carrier Board Display - AliExpress
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