Espressif never stop to surprise us with new products. Their new ESP32-PICO-D4 IC has build in 4MB SPI Flash and quartz crystal, antenna matching circuit, so this chip requires just 5 external resistors and capacitors to work! If your design has to be small this is the chip for you!
ESP32-PICO-KIT is low cost development board for this new chip and has build in USB serial programmer, antenna and breadboard friendly DIL header connectors at 0.1″ step.
ESP32-CAM is WiFi IP camera with OV2640 2 Mpix sensor it works with internal PCB antenna and needs just 3.3V external power supply to operate. You also have SD-card connector and GPIOs to which you can connect PIR sensors and other components to control.
There is Arduino support for this board and tons of interesting projects like face recognition, motion detectors with storage of the pictures on the SD card and etc.
Here are few of them:
- ESP32-CAM video streaming and face recognition with Arduino
- ESP32-CAM PIR Motion Detector with Photo Capture (saves to microSD card)
- ESP32-CAM Take Photo and Save to MicroSD Card
- ESP32-CAM Video Streaming Web Server (Home Assistant, Node-RED, etc.)
We also got ESP32-CAM-UFL which is same board but with U.FL connector where you can connect external antennas.
ESP32-CAM-EA is ESP32-CAM with small external WiFi/BT antenna which increased the WiFi coverage.
If you need more coverage we have ESP32-CAM-EAX which has higher gain antenna, but with quite bigger size.
olimex 
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