RootSense¶
The RootSense is a add-on development board designed to be used togheter with RootMaster when the built in sensing capabilities is not enough.
Key Features:
Atlas Scientific Sensor Integration: Effortlessly monitor pH, Electrical Conductivity (EC), Dissolved Oxygen (DO), Temperature, and more with the industry’s most trusted sensors.
Note
EZO™ pH Circuit must be purchased separately.
Customizable: The swapable sensing hat allows to use anything from low cost pH probes to Atlas Scientific ranges of probes.
Power¶
The RootSense is be powered with 12V through its XT30PW(2+2) connector.
STM32G473¶
At the core there is a STM32G473 that is connected to the sensor interface.
CAN-FD¶
There is a CANbus connecting the STM32 to the OpenHydroponics network. This is CAN-FD compatible with a speed of 1 Mbit/s. It is connected to the FDCAN3 peripheral in the MCU.
On the board there is a 2 pin pinsocket for termination. Adding a jumper to this will connect a 120 Ω resistor to the CAN bus.
Pin Number | Pin Name | Connected To | Note |
|---|---|---|---|
40 | PB3 | CAN-TX | |
41 | PB4 | CAN-RX |
LEDs¶
RootSense has two leds for status and debug. Both yellow.
Pin Number | Pin Name | Connected To | Note |
|---|---|---|---|
2 | PC13 | LED1 | Active Low |
3 | PC14 | LED2 | Active Low |
pH¶
The pH sensor interface must be used togheter with one of the sensor hats. This interface is connected to the i2c bus I2C1. Please see the respecive documentation for each on how to intefrate them into the software.
There is a GPIO on RootSense that enables the pH peripheral that must be enabled before any readings can be performed.
Pin Number | Pin Name | Connected To | Note |
|---|---|---|---|
14 | PA6 | Disable | Active high, must be low to turn on sensor readings |
44 | PB7 | I2C1 SDA | |
39 | PA15 | I2C1 SCL |