# Sentinel Specification Sheet

The Sentinel connects to commercial camera traps to process captured images and transmit results of animal species detected by a neural network on-device. It includes a custom printed circuit board with a low-power microcontroller (Microchip SAM D21E) and an embedded computer with tensor processing unit (Google Coral SoM) for image processing. The circuit board also includes power management components, a camera trigger detection circuit, and microSD storage for processed image data. Communication modules may include cellular (Blues Wireless), LoRaWAN (Blues Wireless), or satellite (SpaceX) in addition to built-in WiFi. The circuit board is powered by rechargeable lithium-ion batteries and enclosed in a weather-proof housing.

## Product Description

* Attach to any trail camera with a standard SD card slot
* Run powerful customized on-board AI-models 
* Get insights out from nearly anywhere with customizable, modular communication options (satellite, cellular, LoRaWAN)
* Long battery life enabled by customizable processing periods

## Technical Specifications

#### Performance

* Customizable Photo Processing Periods
  * Immediate processing
  * Photo count reached (every 10 photos, 30 photos, etc)
  * Set time period (every 6 hours, 24 hours, 3 days etc)
* Battery Life
  * \~65-100 processing cycles per battery (e.g. 65 cycles\*7 batteries / (24hrs in a day / 12 hour processing period) = 227.5 days estimated battery life)
* Model Support
  * YOLOv5 (including MegaDetector v5)
  * EfficientDet
  * MobileNet
  * ResNet
  * FOMO (Edge Impulse)
* Camera Support
  * Most commercial camera traps with a standard SD card slot
* External Memory Support
  * MicroSD (up to 1 TB)
  * USB (up to 1 TB)
* Power Consumption
  * Sleep: <1mA&#x20;
  * Image Processing: 600mA-1A
  * Peak (for microseconds): 3A&#x20;

<div align="left"><figure><img src="https://4046831678-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FnUntv7qZyr87jWYksMB8%2Fuploads%2Fr5UDX2BZdeWSD0P6SGTR%2FScreenshot%202023-12-01%20154049.png?alt=media&#x26;token=ee396e56-9cdd-4329-b619-e2a95f2931a8" alt=""><figcaption><p>Power consumption during activity states</p></figcaption></figure></div>

#### Electronics

* Google Coral SoM (System-on-Module)
  * NXP i.MX 8M SoC (quad Cortex-A53, Cortex-M4F)&#x20;
  * Google Edge TPU coprocessor (4 TOPS (int8); 2 TOPS per watt)
  * 8GB eMMC flash storage
* Microchip SAM D21E Microcontroller
* Spypoint Cell-Link Cable
  * 512MB SD to USB interface
* Communication Options
  * Wi-Fi (802.11b/g/n/ac 2.4/5GHz)
  * Satellite (optional, SpaceX Swarm M138)
  * Cellular (optional, Blues Wireless Cellular Notecard with external SIM slot)
  * LoRaWAN (optional, Blues Wireless LoRa Notecard)
* Power Options
  * (preferred) 2x 18650 rechargeable lithium-ion batteries&#x20;
  * (optional) 5x 18650 rechargeable lithium-ion batteries
  * (optional) External solar-powered battery pack (note this replaces all 18650 batteries)
  * JST connector
  * Micro-USB

<div align="left"><figure><img src="https://4046831678-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FnUntv7qZyr87jWYksMB8%2Fuploads%2FTAlaCGgzOgQLwN2G0Tbg%2FScreenshot%202023-12-01%20154957.png?alt=media&#x26;token=e6fa8689-e746-4004-991d-020599de9734" alt=""><figcaption><p>Sentinel hardware components</p></figcaption></figure></div>