Integrating CB2S with OpenBK for a Smart Soil Moisture-Based Watering System

Question

Repurposing a CB2S Module (BK7231N_1.0.1) for a DIY Watering System with OpenBK Key Goals: Control a water pump based on soil moisture levels, using a CB2S module flashed with OpenBK. Monitor moisture levels and manually control the pump through a web interface. Challenges and Questions: OpenBK...

p.kaczmarek2 · Answer

That's a lot of questions. Have you looked into our autoexec script examples? This should be the first step at learning OBK scripting:

electrikphone · Answer

I apologize, I am eager to try and make this work. I have already started looking at the drivers section and maybe using 'SHT3X' and IO pin roles like 'CHT8305_DAT'.
Thank you @p.kaczmarek2 for pointing me towards the autoexec script examples! I've already started taking a look...

The sensor I have is the 'AZDelivery Soil Moisture Sensor Hygrometer Module V1.2 capacitive compatible with Arduino'

I already have the idea running from my Arduino, but seeing as I have two broken generic LSPA7 smart plugs that reported current use (BL0942) and also had a relay. The only other chip on the board is KP3210SG chip as I think the power supply. I thought it wouldn't be that hard to make a little circuit that would use the CB2S with I think BN7231N chip on it to do the same thing.
I have already managed to make my web interface display 'Humidity 0.0% (8)' below the trigger button for relay. I'm not sure what the (8) means yet.

Will this device run my Arduino sketch by any chance?

p.kaczmarek2 · Answer

You can write a custom driver in C for that, but syntax would be a bit different. What kind of device would you like to drive? What kind of protocol is used by 'AZDelivery Soil Moisture Sensor Hygrometer Module V1.2 capacitive compatible with Arduino'?

electrikphone · Answer

The device is a 'AZDelivery Soil Moisture Sensor Hygrometer Module V1.2.' It's a capacitive sensor that outputs an analog voltage, providing real-time moisture readings.

Output range: Based on my Arduino code, the sensor output ranges between approximately 398 (wet) and 809 (dry). This corresponds to a voltage range of roughly 0-5V, as typical for analog sensors on the Arduino Uno.
Arduino compatibility: I've successfully used it with an Arduino Uno, reading its output on an analog pin and obtaining values within the mentioned range. Here's a simplified example of the Arduino code I used:


// Define the sensor pin
const int sensorAnalog = A0;  // Analog output pin of sensor
const int dry = 809;  // Value for dry sensor
const int wet = 398;  // Value for wet sensor
void setup() {
  Serial.begin(9600);
}
void loop() {
  int sensorValue = analogRead(sensorAnalog);  // Read sensor value from the defined pin
  int moisturePercent = map(sensorValue, wet, dry, 0, 100);  // Calculate moisture percentage
  Serial.print("Moisture: ");
  Serial.print(moisturePercent);
  Serial.println("%");
  delay(100);  // Delay between readings
}

I've found a datasheet for the sensor, see attachment
I'm excited to integrate this sensor with OpenBK, but I'm not familiar with the specific protocol or driver requirements needed. Any guidance on how to proceed would be greatly appreciated.
For example how do I upload a hex file of my C++ sketch or what compiler should I use?

Ps I'm not sure what protocol it uses if that doesn't answer your question :-)

Below is an explanation of code

Spoiler:

Define Constants:

dry: Stores the value you observed for the sensor when it's completely dry.
wet: Stores the value you observed for the sensor when it's fully submerged in water.

Serial.begin(9600): Initializes serial communication for printing readings to the serial monitor.

const int sensorAnalog = A0;: This line defines a constant variable named sensorAnalog and assigns it the value A0. This means that throughout the code, whenever you use sensorAnalog, it will refer to analog pin A0 on the Arduino.

analogRead(sensorAnalog): In the loop function, this line now uses sensorAnalog to specify which pin to read the analog value from. By defining the pin as a constant, it's easier to modify if you decide to connect the sensor to a different pin in the future.

sensorValue = analogRead(A0): Reads the raw analog value from pin A0 (adjust if connected to a different pin).
moisturePercent = map(sensorValue, wet, dry, 0, 100): Maps the sensor value to a percentage between 0 and 100, using the wet and dry values as the range.
Serial.print("Moisture: "): Prints "Moisture: " to the serial monitor.
Serial.print(moisturePercent): Prints the calculated moisture percentage.
Serial.println("%"): Prints a "%" symbol for clarity.
delay(100): Pauses for 100 milliseconds before taking the next reading.

electrikphone · Answer

I'm using a sensor connected to pin 8 (ADCI/OADC) of the IC (corresponding to P23).
Can someone clarify the OpenBK pin naming convention for this module?
Should I use 'P23' or a different name in the autoexec script?
Is there a table or function that maps physical pin labels like '8' to OpenBK pin names for my specific module?
Can someone share an example OpenBK script for reading an analog sensor connected to pin 8 (ADCI/OADC) on my module?

p.kaczmarek2 · Answer

This is just a simple ADC read. Set the P23 role to "ADC" in pins:

and you should get a value read in the related channel... no scripting needed. What do you want to do with that value later?

You can, for example, script relay to open or close, based on this value.

electrikphone · Answer

Yes, I would like to have the reading from the sensor start and stop a relay based on a min and max trigger set by me.
Please forgive my ignorance, you said set P23 as ADC. However, the CB2S has only 11 physical pins. The datasheet says physical pin 8, which corresponds to P23 of the IC. So, is the cfg_pins talking about the pins of the IC?
In the web app, I set the Channel Type of P23 to humidity.
However, I noticed a custom type. How do I use that?
Also, how do I script the relay to open or close based on this value?

Integrating CB2S with OpenBK for a Smart Soil Moisture-Based Watering System

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