Custom Cellular Weigh Scale Board
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| Microcontroller |
ESP32 |
| Modem |
GSM / NB-IoT / LTE-M (Nano-SIM) |
| GNSS |
GPS, BeiDou, Galileo, GLONASS and QZSS |
| Supported Sensors |
Load Cell, Temperature, Humidity |
| Power Supply |
USB, Battery, Solar Panel |
| Misc |
Switches / Headers for firmware flashing and debugging |
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Support for external switch |
| Software |
micropython |
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Open-source libraries & demo scenarios @ Github |
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Weigh Scale calibration web-based wizard |
| Dimensions (L x W x H) (+ WiFi antenna) |
78 (83.5) x 57.2 x 16.7 mm |
| Weight |
25 g |
| Enclosure |
IP65/IP67 |
Example Applications
- Beehive monitoring
- Weight, Temperature, humidity
- Environmental monitoring
- Air quality, Temperature, humidity
- Asset tracking
- Location, Speed, Temperature, humidity
Sensors Support
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| On-board Sensors |
Temperature/Humidity Sensor (based on the SHT40 chip) |
| On-board Sensor Circuit |
ADC and amplifier for load cell sensors |
| External Sensor Interfaces |
Analogue / Digital: 1-wire @ 3.3V (3-Pin) |
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Load Cell (5-Pin) |
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Fixed Terminal Block with push-in connection (no tools required) |
Communication
- Wireless technologies
- WiFi
- Bluetooth
- GSM / NB-IoT / LTE-M
- Transport protocols
- TCP/UDP over IPv4/IPv6
- MQTT
- CoAP
Power Supply
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| USB |
Port |
Input Voltage |
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Micro USB |
Min. |
Typ. |
Max. |
Units |
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4.5 |
5 |
5.5 |
V |
| Battery |
Port |
Nominal Characteristics |
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JST |
1 x Rechargeable LiPo 1S1C 3.7-4.2 V |
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| Solar Panel |
Port |
Input Voltage |
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Fixed Terminal Block with push-in connection (no tools required) |
Min. |
Typ. |
Max. |
Units |
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5.5 |
6 |
6.5 |
V |
Operating Conditions
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| Microcontroller Operating Voltage |
3.3 V |
| Charging Current Limit |
440 mA |
| Maximum Drawn Current |
3 A |
| Operational Temperature |
0 – 60 C |
| Charging Temperature |
0 – 60 C |
Charging State Indication (LEDs)
| Charge cycle state |
LCR LED |
| No input |
OFF |
| Temperature fault |
BLINKING |
| No battery |
BLINKING |
| Charging |
ON |
| Charge complete |
OFF |
Switches
| Switch Name |
Details |
| S1 |
Controls power supply to the micro-controller (the battery charging process is not affected) |
| S2 |
Tactile switch for resetting the micro-controller |
| S3 |
Tactile switch for activating the micro-controller’s bootloader (needed only for fw upgrade) |
| EXT SW |
External latching switch to control micro-controller’s power (the battery charging process is not affected) |
| SNSR |
Electronic software-controlled switch for enabling/disabling power supply to sensors on-demand |
Switch combinations & power supply
| External switch (EXT SW) |
On-board switch (S1) |
Circuit |
| Open |
ON |
ON |
| Open |
OFF |
OFF |
| Closed |
ON |
ON |
| Closed |
OFF |
ON |
Energy Consumption Profiling
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| Battery Voltage |
Accurate Measurement of battery voltage even at charging state |
External components required/recommended
- Battery
- Solar Panel
- Flexible Cellular Antenna
- Flexible GPS Antenna
- SIM card
Marking
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| CE |
planned |
| FCC |
planned |
| RoHS |
planned |
Custom designs
The existing boards are highly configurable and expandable so if the existing boards do not fit your need, get in contact with us and we will tailor a solution for you with your customizations.