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Let's add code so that when the soil moisture level is low, the servo waters the plant.

From the soil moisture project, we know that the moisture is low when the reading is roughly less than 500. We can use this number to add an if reading < 500 in the code to decect a dry condition.

let reading = 0
if (reading < 500) { }

The servo is connected to pin P2 so we can use the ||pins:servo write|| block to change the angle of the servo. We want the angle to change to 0, wait until the water pours off, and then move the angle back to 80.

let reading = 0
if (reading < 500) {
    basic.showIcon(IconNames.Umbrella)
    pins.servoWritePin(AnalogPin.P2, 0);
    basic.pause(3000)
    pins.servoWritePin(AnalogPin.P2, 80)
    basic.pause(3000)
    pins.analogWritePin(AnalogPin.P2, 0)
}

Insert the code above in the ||basic:forever|| loop of the soil moisture code.

radio.setTransmitSerialNumber(true)
radio.setGroup(4)
led.setBrightness(64)
let reading = 0
basic.forever(() => {
    pins.analogWritePin(AnalogPin.P1, 1023)
    reading = pins.analogReadPin(AnalogPin.P0)
    radio.sendNumber(reading / 4);
    pins.analogWritePin(AnalogPin.P1, 0)
    led.plotBarGraph(
        reading,
        1023
    )
    if (input.buttonIsPressed(Button.A)) {
        basic.showNumber(reading)
    }
    if (reading < 500) {
        basic.showIcon(IconNames.Umbrella)
        pins.servoWritePin(AnalogPin.P2, 0);
        basic.pause(3000)
        pins.servoWritePin(AnalogPin.P2, 80)
        basic.pause(3000)
        pins.analogWritePin(AnalogPin.P2, 0)
    }
    basic.pause(5000);
})

Here's a video showing the @boardname@ watering a plant.

https://youtu.be/7eC_VjH1eP0

radio

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