--GPIO36/Channel0 and GPIO39/Channel3 soil humiditiy sensors -- 
-- List of *all* available ADC1 channels on ESP32 WROOM module:
-- 0: GPIO36, 1: GPIO37, 2: GPIO38, 3: GPIO39, 4: GPIO32, 5: GPIO33, 6: GPIO34, 7: GPIO35

function irrigationmeasure()
adc.setup(adc.ADC1, 0, adc.ATTEN_11db)
humidity1adc = ADCmeasure(0, 20)

adc.setup(adc.ADC1, 3, adc.ATTEN_11db)
humidity2adc = ADCmeasure(3, 20)

function humidity_percent(voltage, result)
local result

if voltage > 0.7 then 
result = (voltage - 1.15) / 0.016
if result > 100 then result = 100 end
if result < 0 then result = 0 end
result = math.floor(result)
result = 100 - result
return result

else return -1
end 
end

-- 1.1 Volt = 100 percent humiditiy
-- 2.7 Volt = 0 percent humidity

local Vref11dB = Vref * 0.0034

humidity1_sensor_voltage = (humidity1adc / 4095) * Vref11dB
humidity1 = humidity_percent(humidity1_sensor_voltage)
printv(3,"Humidity1_sensor voltage: ", humidity1_sensor_voltage, "V")
printv(3,"Humidity1_sensor adc: ", humidity1adc)
printv(2,"Humidity1_sensor percent: ", humidity1)

humidity2_sensor_voltage = (humidity2adc / 4095) * Vref11dB
humidity2 = humidity_percent(humidity2_sensor_voltage)
printv(3,"Humidity2_sensor voltage: ", humidity2_sensor_voltage, "V")
printv(3,"Humidity2_sensor adc: ", humidity2adc)
printv(2,"Humidity2_sensor percent: ", humidity2)

-- Tank gauge 170 Ohm (full) to 0 Ohm (empty), series resistor 820 Ohm

adc.setup(adc.ADC1, 7, adc.ATTEN_11db)
tankgaugeadc = ADCmeasure(7, 2)

if tankgaugeadc > 4000 then printv(1, "Water tank gauge sensor not connected!") 
tankgauge = -1
else
adc.setup(adc.ADC1, 7, adc.ATTEN_0db)
tankgaugeadc = ADCmeasure(7, 40)
tankgauge = tankgaugeadc / 8.85
tankgauge = math.floor(tankgauge)
tankgauge = tankgauge / 2
adc.setup(adc.ADC1, 7, adc.ATTEN_11db)
end

--if tankgauge ~= nil and tankgauge > 100 then tankgauge = 100 end

printv(2, "Water tank level at", tankgauge, "percent")
printv(3, "Water tank sensor ADC value:", tankgaugeadc)

irrigation = {humidity1, humidity2, tankgauge}

return irrigation 
end

irrigationmeasure()

if V_out < low_voltage_disconnect and charge_state_int < 30 then
        print("Disabled power output due to low battery voltage")
--        gpio.wakeup(14, gpio.INTR_LOW)
        gpio.write(14, 0)
        low_voltage_disconnect_state = 0
        gpio.write(12, 0)
        gpio.write(13, 0)
        gpio.write(26, 0)
        gpio.write(27, 0)
        node.dsleep(60000000)
end
    
if V_out > 12.3 and load_disabled == false then 
--       gpio.wakeup(14, gpio.INTR_HIGH)
--       gpio.write(14, 1)
       low_voltage_disconnect_state = 1
       printv(2,"Sufficient battery charge available")
end


-- Water valves and their respective GPIOs:
-- Valve1 = GPIO12, Valve2 = GPIO13, Valve3 = GPIO26, Valve4 = GPIO27
-- It is assumed that Valves 1 and 2 (GPIO 12 and 13) are watering the planting bed monitored by humidity sensor 1.
-- It is assumed that Valves 3 and 4 (GPIO 26 and 27) are watering the planting bed monitored by humidity sensor 2.

if not i_nbld  then i_nbld = false end
if not i_lvl1 then i_lvl1 = 95 end -- Humidity percent
if not i_lvl2 then i_lvl2 = 95 end -- Humidity percent
if not i_hr then i_hr = 3 end -- Full hour
if not i_vlv_opn then i_vlv_opn = 10 end -- Minutes
if  i_vlv_opn > 29 then i_vlv_opn = 29  end

if i_nbld == true and tankgauge > 0 and low_voltage_disconnect_state == 1 and localTime["hour"] == i_hr and localTime["min"] < i_vlv_opn then
-- Turn on load power output of OpenMPPT that drives the water pump and the electric water valves
gpio.write(14, 1)
        if  humidity1 < i_lvl1 then 
        printv(2,"Watering valve 1 is now open for", i_vlv_opn, "minutes" )
        --gpio.write(26, 0)
        --gpio.write(27, 0)
        gpio.write(12, 1)
        --gpio.write(13, 0)
        --gpio.write(26, 0)
        --gpio.write(27, 0)
        end
        
        if  humidity1 >= i_lvl1 then 
        printv(2,"Watering valve 1 is now closed" )
        --gpio.write(26, 0)
        --gpio.write(27, 0)
        gpio.write(12, 0)
        --gpio.write(13, 0)
        --gpio.write(26, 0)
        --gpio.write(27, 0)
         gpio.write(14, 0)
        end

end


if i_nbld == true and tankgauge > 0 and low_voltage_disconnect_state == 1 and localTime["hour"] == i_hr and localTime["min"] < 2 * i_vlv_opn and localTime["min"] >= i_vlv_opn then
-- Turn on load power output of OpenMPPT that drives the water pump and the electric water valves
        if  humidity2 < i_lvl2 then 
        printv(2,"Watering valves 2, 3, and 4 are now open for", i_vlv_opn, "minutes" )
        gpio.write(14, 1)
        gpio.write(12, 0)
        gpio.write(13, 1)
        gpio.write(26, 1)
        gpio.write(27, 1)
        gpio.write(12, 0)
        end
        
        if  humidity2 >= i_lvl1 then 
        printv(2,"Watering valves 2,3,4 are now closed" )
        gpio.write(14, 0)
        gpio.write(26, 0)
        gpio.write(27, 0)
        gpio.write(12, 0)
        gpio.write(13, 0)
        gpio.write(26, 0)
        gpio.write(27, 0)
        
        end

end

if i_nbld == false or tankgauge == 0 or localTime["hour"] ~= i_hr or  localTime["min"] > 2 * i_vlv_opn or humidity2 >= i_lvl2 then
        gpio.write(14, 0)
        gpio.write(12, 0)
        gpio.write(13, 0)
        gpio.write(26, 0)
        gpio.write(27, 0)
        
end

if tankgauge == 0 then printv(1,"ALERT: Water tank is running dry!") end
if tankgauge == -1 then printv(1,"ALERT: No information from water tank level sensor!") end