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Post: Hi sunilvb I don't think using the IO Pi Plus with the HC-SR04 or RCWL-1601 ultrasonic sensor would be possible. The HC-SR04 needs precise timing for sending a pulse and measuring the time for the response. As the IO Pi Plus is I2C-based, it is impossible to make precise timing calculations for changes on the input pins. The length of time needed to send an I2C data packet and the different application processes running on the Raspberry Pi mean that each read from the IO Pi Plus will take a different amount of time. The best option for using an HC-SR04 would be to connect it to a microcontroller like an Arduino or Raspberry Pi Pico where you will have more control for measuring time intervals. You could send the data from the microcontroller to the Raspberry Pi over the UART serial port or through the I2C or SPI bus. The RCWL-1601 sensor uses I2C for communication. You can not use the input pins on the IO Pi Plus for I2C communication so connecting the RCWL-1601 to the IO Pi Plus would not be possible. One solution that may work for connecting up to four RCWL-1601 sensors to the Raspberry Pi would be using our I2C Switch expansion board. The RCWL-1601 has a fixed I2C address so normally you could only connect one RCWL-1601 to the Raspberry Pi but our I2C Switch splits the I2C bus into four separate buses so this allows you to connect four I2C devices with the same address. You can find more information on the I2C Switch on the [url=https://www.abelectronics.co.uk/p/84/i2c-switch]I2C Switch[/url] product page. I have ordered some RCWL-1601 sensors so I can test them with the I2C Switch. As it is close to Christmas it may take a week or two for them to arrive but as soon as they do I will run some tests and let you know if they are compatible.