Main Board

TAT image

General Information
Microcontroller Espressif ESP32-S3 Module
Connectivity WiFi, Bluetooth, NB-IoT/LTE-M with GSM fallback (Nano-SIM Holder)
GNSS Embedded GPS, BeiDou, Galileo, GLONASS and QZSS
Power Supply Battery (primary & rechargeable), USB, Solar Panel
Onboard Diagnostic Sensors Temperature & Humidity
Misc Serial Port (UART) or USB for Debugging
Switch Internal switch & support for external switch
Indicators Various LEDs
Software & Tools Micropython (aligned with version 1.19)
Open-source libraries & example scenarios @ Github
Local Web Configurator through WiFi
Dimensions (L x W x H) 77.47 (83.5*) x 62.23 x 16.7 mm (* with embedded wifi antenna)
Weight 28 g
Current version 1.0.5
SKU INS-B-MAN

Micro-Controller
Model ESP32-S3-WROOM-1
Flash 8 MB (Embedded)
Memory RAM 2 MB (Embedded)

Power Supply
USB Port (Port ID) Input Voltage
Micro USB (J2) Min. Typ. Max. Units
4.5 5 5.5 V
Battery Port (Port ID) Nominal Characteristics
JST (J1) 1 x Rechargeable LiPo/Li-Ion 1S1C 3.7-4.2 V
Solar Panel Port (Port ID) Input Voltage
Fixed Terminal Block with push-in connection Min. Typ. Max. Units
No tools required (J4) 5.5 6 7 V

Connectivity
WiFi & Bluetooth Embedded on Micro-controller
Cellular (NB-IoT/LTE-M/GSM) Quectel BG600 Modem

Operating Conditions
Microcontroller Operating Voltage 3.3 V
Charging Current Limit 440 mA
Maximum Drawn Current (modem) 3 A
Maximum Drawn Current (sensors) 250 mA
Operational Temperature 0 – 50 C
Charging Temperature 0 – 50 C

Switches
S1 Controls power supply to the micro-controller (the battery charging process is not affected)
S2 Tactile switch for rebooting the micro-controller
S3 Tactile switch for activating the micro-controller’s bootloader (needed only for fw upgrade)
J4 Port for connecting external switch

For controling the board using the External Switch, S1 (internal switch) should be in OFF state. If S1 is in ON state, the external switch is bypassed.

Indication LEDs

Charging State Indication (RED LED)

Charge cycle state LCR LED
No input OFF
Temperature fault BLINKING
No battery BLINKING
Charging ON
Charge complete OFF

Modem State Indication (RED LED)

Modem state LCR LED
Disabled OFF
Network Search BLINKING SLOWLY (OFF most of the time)
Idle BLINKING SLOWLY (ON most of the time)
Transferring Data BLINKING QUICKLY

Operational State Indication (RGB LED)

RGB LED Color & Status Operational
blinking random colors File system optimization procedure (firmware version v2.11.0+)
blink white Initializing device
blinking purple Web UI waiting for client (only after hard reboot)
solid purple Web UI with connected client (only after hard reboot)
solid blue Executing enabled measurements
solid red Connecting to network
solid green Network connected, uploading data
solid yellow Uploading data failed
off Deep sleep

On-board diagnostics & debug
Battery Voltage Accurate Measurement of battery voltage even at charging state
Environment Conditions 1 × on-board temperature/humidity Sensor (based on the SHT40 chip)
Location Through embedded GPS (only works outdoors)
Debug Port J5 Standard Serial Port (needs an external USB-to-Serial adapter to connect to PC)
Debug Port J2 Standard Serial Port

Special Configurations
Bypass Charger By default R20 (0 Ohm) is not mounted and R15 (0 Ohm) is mounted. In case you need to bypass the charger and power the board solely through a battery then R15 should be removed and R20 should be mounted
Micro-controller Power Line Break By default R26 (0 Ohm) is mounted. In case you need to break the micro-controller’s power line (e.g. for adding a special circuit like a watchdog) then this should be removed

Protection
Overcurrent 4 x Resettable Fuses for battery, solar panel, USB port, and 3.3V regulator paths
Charge at low/high temperatures 1 x Thermistor disabling charging beyond temperature limits

Expansion Ports

Sensor Expansion Port
Port J9-J10
Type 1 x Single-Row & 1 x 2-row 10-pin Female Socket Header
Usage Attach insigh.io sensor shields or custom applications in breadboards

Connectivity Expansion Port
Port J3
Type 1 x Custom 10-pin Connector (Part number: 90325-0010) compatible with Ribbon Flex Cable (Part number: 92317-1012)
Usage Attach insigh.io connectivity shields

Pinouts

Sensor Expansion Port

J9 J10(L) J10(R)
IO2 IO40 IO35
IO1 IO18 IO36
V_SW IO17 IO37
GND IO11 IO41
3.3V IO9 IO42
GND IO8 IO43
3.3V IO7 IO44
V_ESP IO6 IO48
GND IO5 SCL
S_GND IO4 SDA

Orientation as in the board picture. IOs naming refer to corresponding ESP32-S3-WROOM-1 IOs.

  • Power Pins (Output Only)

    • 3.3V : Constant 3.3V Output from LDO used also to power the micro-controller
    • V_SW : Internal switch output voltage before the regulator (post-charger output)
    • V_ESP : Used for breaking the micro-controller’s power line if needed (see custom configurations)
    • GND : Common Ground
    • S_GND : Electronically-controlled Ground Pin (ground switch through IO12)

  • Other Sensor/Control Pins (Input/Output)

    • SCL (IO38) : I²C Control Line (Already Pulled-up)
    • SDA (IO39) : I²C Data Line (Already Pulled-up)
    • IO43 : UART TXD0 for Debugging/Firmware Flashing using USB-to-Serial Cable (also exposed in separate header “J5”)
    • IO44 : UART RXD0 for Debugging/Firmware Flashing using USB-to-Serial Cable (also exposed in separate header “J5”)
    • IO4-9 : General I/O, can be used as ADC pins
    • All other pins, except reserved pins mentioned below, can be freely used as digital IOs and power pins with low (up to a few mA) current requirements

  • Reserved Pins (Used for internal purposes only)

    • IO3 & IO14 : Measure the battery state (voltage)
    • IO12 : Control (Enable/Disable) the additional ground pin (S_GND)
    • IO21 & IO47 : Control (Power/Set) the RGB LED
    • IO10 & IO13 : Control (Reset/Enable) the Cellular Modem
    • IO15 & IO16 : Serial (UART) Pins for communicating with the Cellular Modem
    • IO19 & IO20 : D-/D+ pins for native USB control

Connectivity Expansion Port

J3
1 GND
2 3.3V
3 IO40
4 IO18
5 IO35
6 IO36
7 SDA
8 UART1_TX
9 SCL
10 UART1_RX
  • GND: Common Ground
  • 3.3V: Used for powering the modem of the shield
  • IO40, IO18, IO35, IO36: Free digital pins to use in the shield as input/output
  • SDA/SCL: Exposed I²C bus to accomodate compatible devices
  • UART1_TX/UART1_Rx: Exposed Serial Bus to accomodate compatible devices (modem, GPS, etc.)

Marking
CE ongoing, expected to be completed in Q1-2026

Changelog

Version Release Date Comments
1.0.5 (latest) 08/12/2025 Correct footprint of fuse
1.0.4 05/03/2025 Change resettable fuses to tolerate higher voltages
1.0.3 20/08/2024 Minor mechanical changes (holes standoffs)
1.0.2 31/12/2023 Fix increased deep sleep current due to external switch pulled down resistor
1.0.1 17/03/2023 Added resettable fuses to solar panel, battery and the output of the 3.3V regulator; Change connector for connectivity shield
1.0.0 29/06/2022 First stable version with ESP32-S3 & Sensor Expansion Port