Arducam HM01B0 QVGA CMOS Monochrome Camera Module for RP2040 & Arduino

Connect the module's I2C pins (SCL, SDA) to the Pico's I2C bus for control and configuration. The video data pins (e.g., VSYNC, HSYNC, PIXCLK, and DATA) must be connected to GPIOs configured as inputs. You will need to use a library, like Arducam's provided examples, to initialize the sensor via I2C registers and then read the parallel video data stream from the GPIOs, managing the sync signals to capture complete frames.

The HM01B0 is specifically designed as an Ultralow Power Image Sensor (ULPIS). While exact current figures depend on configuration (frame rate, gain, window size), it consumes orders of magnitude less power than standard image sensors. This enables 'always-on' vision functionality in battery-powered projects, as the sensor can run continuously while the main microcontroller sleeps, waking it via the motion detection interrupt only when activity is detected.

Yes, the HM01B0 offers extensive programmability via its I2C interface. You can write to specific registers to set the analog gain (up to 8x), digital gain (up to 4x), exposure time, frame size (including QVGA windowing), and frame rate. It also supports an automatic exposure and gain control (AEC/AGC) loop that can be enabled, and includes flicker avoidance for 50Hz or 60Hz lighting environments.

The on-chip motion detection circuit allows you to define a Region of Interest (ROI) within the frame and set a pixel difference threshold. The sensor continuously compares consecutive frames within this ROI. When the difference exceeds your threshold, it triggers a digital output pin, which can be configured as an interrupt to a host microcontroller. This allows the main processor to remain in deep sleep, conserving significant power, and only wake to process imagery when motion is detected.