Electronics Weekly (blog) 502IoT Raspberry Pi add-on promises to be a professional sensor hub Electronics Weekly (blog) “The 502IoT Shield adds to the Pi with I/O including SPI, I2C, analog, digital/PWM and buffered 1-Wire bus. These are accessible via industry standard Grove and PMOD I/O expansion connectors

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502IoT Raspberry Pi add-on promises to be a professional sensor hub – Electronics Weekly (blog)