My customizations for the stem-minds eduponics mini

README.md

This is my customized eduponics mini firmware, it might not be compatible with the official app.

The main change I made is to use asyncio for the main loop. I did this so that I can more easily turn on water for just a few seconds.

The other main change is instead of generating a unique UUID I use the device's unique MAC address. Every device as a unique MAC address at creation, so this will still be globally unique but will be a lot less to type in.

I've also included a node-red control panel. I use the aedes broker you can install directly into node-red.

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        "id": "f0364f4de8363bf3",
        "type": "change",
        "z": "e93d07e3f8f4822c",
        "name": "",
        "rules": [
            {
                "t": "set",
                "p": "payload",
                "pt": "msg",
                "to": "payload.status = \"pending\" ? 100 : 0 ",
                "tot": "jsonata"
            }
        ],
        "action": "",
        "property": "",
        "from": "",
        "to": "",
        "reg": false,
        "x": 540,
        "y": 620,
        "wires": [
            [
                "becc4251c9462313",
                "61a643561f6e6d7b",
                "ffde034e27195fcf"
            ]
        ]
    },
    {
        "id": "a201c1058fd6c9b0",
        "type": "inject",
        "z": "e93d07e3f8f4822c",
        "name": "",
        "props": [
            {
                "p": "payload"
            },
            {
                "p": "topic",
                "v": "false",
                "vt": "bool"
            }
        ],
        "repeat": "",
        "crontab": "",
        "once": true,
        "onceDelay": 0.1,
        "topic": "",
        "payload": "",
        "payloadType": "date",
        "x": 530,
        "y": 500,
        "wires": [
            [
                "b68fa5e5a9163ec6"
            ]
        ]
    },
    {
        "id": "ffde034e27195fcf",
        "type": "ui_led",
        "z": "e93d07e3f8f4822c",
        "order": 7,
        "group": "3e90c18ba5ed5691",
        "width": 0,
        "height": 0,
        "label": "Pump on",
        "labelPlacement": "left",
        "labelAlignment": "left",
        "colorForValue": [
            {
                "color": "#63452c",
                "value": "0",
                "valueType": "num"
            },
            {
                "color": "#008000",
                "value": "100",
                "valueType": "num"
            }
        ],
        "allowColorForValueInMessage": false,
        "shape": "circle",
        "showGlow": true,
        "name": "",
        "x": 750,
        "y": 660,
        "wires": []
    },
    {
        "id": "6c71a0de59e0bc04",
        "type": "mqtt-broker",
        "name": "built-in broker",
        "broker": "localhost",
        "port": "1883",
        "clientid": "",
        "autoConnect": true,
        "usetls": false,
        "protocolVersion": "4",
        "keepalive": "60",
        "cleansession": true,
        "birthTopic": "",
        "birthQos": "0",
        "birthPayload": "",
        "birthMsg": {},
        "closeTopic": "",
        "closeQos": "0",
        "closePayload": "",
        "closeMsg": {},
        "willTopic": "",
        "willQos": "0",
        "willPayload": "",
        "willMsg": {},
        "sessionExpiry": ""
    },
    {
        "id": "3e90c18ba5ed5691",
        "type": "ui_group",
        "name": "Planter 1",
        "tab": "ac65656392cf4fca",
        "order": 1,
        "disp": true,
        "width": "6",
        "collapse": false,
        "className": ""
    },
    {
        "id": "458af0d74e442447",
        "type": "ui_group",
        "name": "Planter 1 historical",
        "tab": "ac65656392cf4fca",
        "order": 2,
        "disp": true,
        "width": "6",
        "collapse": false,
        "className": ""
    },
    {
        "id": "3e3c4026ab6b3227",
        "type": "persist-store",
        "filename": "planter-1-data.json",
        "interval": "60"
    },
    {
        "id": "ac65656392cf4fca",
        "type": "ui_tab",
        "name": "Plants",
        "icon": "fa-leaf",
        "order": 1,
        "disabled": false,
        "hidden": false
    }
]

main.py

from Eduponics import umqttsimple,bh1750,bme280
import machine
import time
import json
import uasyncio
import network, ubinascii

import ntptime
try:
    ntptime.settime()
except:
    print("Couldn't set time from time server")

# set adc (analog to digital) on pin 35
adc = machine.ADC(machine.Pin(35))
# set 11dB input attenuation (voltage range roughly 0.0v - 3.6v)
adc.atten(machine.ADC.ATTN_11DB)

# Configure light sensor
light_sensor = bh1750.BH1750()

# Configure BME280
# setup I2C connection
i2c = machine.I2C(scl=machine.Pin(15), sda=machine.Pin(4))
# Initialize BME280 object with default address 0x76
bme_sensor = bme280.BME280(i2c=i2c)
# initialize dht object, DHT11 coonected to IO19
#d = dht.DHT11(machine.Pin(19))

# define water level sensor as INPUT on IO pin number 21
water_level = machine.Pin(21, machine.Pin.IN)
water_task=None

# define pump on pin IO23 as OUTPUT, define pump state
pump = machine.Pin(23, machine.Pin.OUT)
pump_state = False

# MQTT Unique ID
UUID = ubinascii.hexlify(network.WLAN().config('mac'),':').decode() #"planter_1"
# MQTT Topics
topics = ["plants/soil","plants/environment","plants/water",]

def handle_water_level(pin):
    global pump_state
    global water_task

    # water level triggered, turn off the pump
    # wait for 0.3 seconds to make sure it's just a little below the water sensor
    # else the pump might become unstable
    time.sleep(0.3)
    pump.value(0)
    pump_state = False
    if water_task: water_task.cancel()
    client.publish("%s/plants/water" % UUID, str({"status":"no_water"}).replace("'",'"'))


def get_soil_moisture():

    # sensor min and max values
    # can be changed and callibrated
    minVal = 500
    maxVal = 4095

    # read soil moisture sensor data
    val = adc.read()

    # scale the value based on maxVal and minVal
    scale = 100 / (minVal - maxVal)
    # get calculated scale
    normal_reading = int((val - maxVal) * scale)
    # we can also get inverted value if needed
    inverted_reading = ("%s%s" % (int((minVal - val) * scale),"%"))
    # for this example we'll return only the normal reading
    # put everything in a JSON format suitable for the eduponics app
    plant = {
        "id":0,
        "enabled":1,
        "moisture":normal_reading,
        "raw_moisture": val
    }
    # return the data
    return str(plant).replace("'",'"')

def get_environmental_data():

    # get light from the light sensor
    lux = int(light_sensor.readLight())
    # get bme280 sensor data
    bme280_values = bme_sensor.values
    temperature = bme280_values[0].replace("C","")
    pressure = bme280_values[1]
    humidity = bme280_values[2].replace("%","")
    # get DHT11 sensor data
    # measure sensor data
    #d.measure()
    # get temperature and humidity
    #temperature = d.temperature()
    #humidity = d.humidity()
    # get water quantity
    water_quantity = water_level.value()

    # put all this data into a JSON object
    data = {
        "temp":temperature,
        "humidity":humidity,
        "sunlight":lux,
        "water_quantity":water_quantity
    }

    return str(data).replace("'",'"')

async def water_plant(seconds):
    print("Watering plants")
    global pump_state

    if  water_level.value() == 1:
        # turn off the pump
        pump.value(0)
        pump_state = False
    else:
        # turn on the pump
        pump.value(1)
        pump_state = True
        client.publish("%s/plants/water" % UUID, str({"status":"pending","remaining":seconds}).replace("'",'"'))

    for i in range(int(seconds)):
        await uasyncio.sleep(1)
    pump.value(0)
    pump_state = False
    client.publish("%s/plants/water" % UUID, str({"status":"ok","lastrun":time.time()}).replace("'",'"'))

    return True

def on_message_callback(topic, msg):
    '''
    this is a callback, will be called when the app asks for certain information
    such as to water the plants when the watering button pressed
    '''
    global water_task
    # convert topic and message byte to string
    topic = str(topic, 'utf-8')
    try:
        msg = json.loads(str(msg, 'utf-8'))
    except:
        print("Couldn't parse",msg,"at",topic)
        return
    print(topic,msg)

    if(topic == "%s/plants/soil" % UUID or topic == "%s/plants/environment" % UUID):
        # Do nothing, we only publish to those topics
        pass
    elif(topic == "%s/plants/water" % UUID):
        # when the app request for plant watering it goes here
        if("time" in msg):
            # valid request, let's process it
            print("starting plant water")
            #Cancal old task.
            if water_task: water_task.cancel()
            # it's waiting for us to water it, let's water it
            water_task = uasyncio.create_task(water_plant(msg["time"]))

    else:
        print((topic, msg))

def connect_and_subscribe():

    print("[-] Connecting to MQTT client ...")
    # set the MQTT broker object
    client = umqttsimple.MQTTClient(server="192.168.2.173",ssl=False)
    # set a callback for incoming messages (subscribed topics)
    client.set_callback(on_message_callback)
    # connect to the broker
    client.connect()

    # subscribe to the topics
    for topic in topics:
        client.subscribe("%s/%s" % (UUID,topic))
        print("[-] Subscribed to %s successfully" % topic)
        print("[-] Connected to %s MQTT broker successfully" % client.server)

    return client

def restart_and_reconnect():
    # something  went wrong, reconnect in 5 seconds ...
    print('[-] Failed to connect to MQTT broker. Reconnecting...')
    time.sleep(5)
    machine.reset()

try:
    client = connect_and_subscribe()
except OSError as e:
    restart_and_reconnect()

from boot import station
import os

def system_info():
    data = {
        "uptime":time.ticks_ms(),
        "signal_strength":station.status('rssi'),
        "freq": machine.freq(),
        "time": time.time(),
        "mem_free": gc.mem_free(),
        "mem_used": gc.mem_alloc(),
        }
    return str(data).replace("'",'"')

async def main():
    # configure few variables
    last_message = 0
    message_interval = 5
    # set callback on the water level sensor, if no water stop the pump
    water_level.irq(trigger=machine.Pin.IRQ_RISING, handler=handle_water_level)

    while True:
        try:
            # check if there are new messages pending to be processed
            # if there are, redirect them to callback on_message_callback()
            client.check_msg()

            # check if the last published data wasn't less than message_interval
            if (time.time() - last_message) > message_interval:
                # get soil moisture
                soil_moisture = get_soil_moisture()
                # publish soil moisture data
                client.publish("%s/plants/soil" % UUID, soil_moisture)
                #print("[-] published soil moisture")

                # update environmetal data
                env = get_environmental_data()
                client.publish("%s/plants/environment" % UUID, env)
                client.publish("%s/plants/system" % UUID, system_info())

                #print("[-] published evironmental data")

                # update last message timestamp
                last_message = time.time()


        except OSError as e:
            # if something goes wrong, reconnct to MQTT server
            restart_and_reconnect()
            
        machine.idle()
        await uasyncio.sleep(0.5)
            
uasyncio.run(main())
restart_and_reconnect()

Love it. I will look perhaps to modify Eduponics APP and make it compatible if it doesn't work out-of-the-box already.

Mostly the difference is that you need to send a message like {"time": 5} to {UUID}/plants/water in order to get it to run the pump for 5 seconds, or 10 for ten seconds, etc. Changing water/ to "{"status": "Pending"}" will do nothing.