Adrian Mitevski
A multifunctional and modular Firmware for Multitech's mDot based on ARM mBed provides a widerange of functionality for several Sensors such as MAX44009, BME280, MPU9250, SI1143 and uBlox. It allows you to quickly build a Sensornode that measures specific data with its sensors and sends it via LoRaWAN.
Dependencies: mDot_LoRa_Sensornode_Flowmeter_impl mbed-rtos mbed
Installation of the Sensors
mDot Pinout¶
The image shows you all the Pins of the mDot and its names.
Connecting Sensors with mDot¶
Connect the pins of the Sensors according to the following tables
MAX44009¶
| MAX44009 Pin | mDot Pin |
|---|---|
| SDA | PC_9 |
| SCL | PA_8 |
| VCC | VOUT |
| GND | GND |
BME280¶
| BME280 Pin | mDot Pin |
|---|---|
| SDA (SDI) | PC_9 |
| SCL (SCK) | PA_8 |
| (SDO) | GND |
| VDD | VOUT |
| GND | GND |
If you are using Adafruits Breakoutboard make sure you connected SDO to GND. More information on Page 31 of the official Datasheet.https://cdn-shop.adafruit.com/datasheets/BST-BME280_DS001-10.pdf
MPU9250¶
| MPU9250 Pin | mDot Pin |
|---|---|
| SDA | PC_9 |
| SCL | PA_8 |
| VDD | VOUT |
| GND | GND |
SI1143¶
| SI1143 Pin | mDot Pin |
|---|---|
| SDA | PC_9 |
| SCL | PA_8 |
| VDD | VOUT |
| GND | GND |
uBlox M8¶
| uBlox Pin | mDot Pin |
|---|---|
| RX | PA_2 |
| TX | PA_3 |
| VDD | VOUT |
| GND | GND |
You don't need to connect every Sensor just the ones that you want to use for your specific use-case.
Important: Please make sure that you've mounted some pullup Resistors betwenn vcc/sda and vcc/scl