ST STM32 User Manual

UM0908
User manual
®
STM32-based camera with ZigBee connectivity
Introduction
This user manual describes the function of hardware boards on the "STM32 based camera
®
with ZigBee connectivity" system (henceforth the system). The system is designed as two
separate hardware units. One of the hardware units (called the "camera unit") consists of a
camera and ZigBee module interfaced with an STM32 microcontroller, while the other unit
(called the "monitoring unit") consists of a TFT and ZigBee module interfaced with an
STM32 for viewing/monitoring jpeg images.
The STM32 microcontroller in the camera unit captures jpeg images from the camera (using
DMA) and transfers them onto the ZigBee network using an SPI controlled SN260 module.
The images are transferred into jpeg format which helps to save transfer time on the ZigBee
network. The camera unit can also record these images in the onboard memory (microSD
card) using a FAT file system. The user can record these images at the click of a button or
the present system can be expanded to record the images once motion is detected by the
camera (using a PIR sensor).
The monitoring unit scans for jpeg images on the ZigBee network. Once the images are
available on the network they are captured. These jpeg images are then converted into bmp
format for display on the onboard TFT. Both units can be powered either by battery or
through a USB. The system can be configured to go into standby mode as per user
configuration. This feature helps in reducing the power consumption of the system. With
these features, the system is useful for applications where certain areas need to be
monitored wirelessly, e.g. door intercoms and baby monitoring systems.
July 2010 Doc ID 17087 Rev 1 1/33
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