Coffee Digital Project

📟 Micro:bit Project: Coffee Digial 

💻 JavaScript Code

// This runs when the phone sends a number via Bluetooth
bluetooth.onUartDataReceived(serial.delimiters(Delimiters.NewLine), function () {
    receivedData = bluetooth.uartReadUntil(serial.delimiters(Delimiters.NewLine))
    money = parseFloat(receivedData)
    if (money > 0) {
        // Calculate volume based on money
        milliliters = money * mlPerDollar
        // Calculate how long the pump needs to run (in milliseconds)
        pumpingTime = milliliters * msPerMl
        runPumpSequence()
    }
})
function runPumpSequence () {
    // Show amount received
    basic.showNumber(money)
    basic.pause(500)
    // Status: Pumping
    basic.showIcon(IconNames.SmallDiamond)
    // TURN ON PUMP (Connected to Pin 0)
    pins.digitalWritePin(DigitalPin.P0, 1)
    // Wait for the calculated duration
    basic.pause(pumpingTime)
    // AUTO-STOP PUMP
    pins.digitalWritePin(DigitalPin.P0, 0)
    // Status: Finished
    basic.showIcon(IconNames.Yes)
    // Reset for next transaction
    money = 0
}
let pumpingTime = 0
let milliliters = 0
let money = 0
let receivedData = ""
let msPerMl = 0
let mlPerDollar = 0
// --- CALIBRATION SETTINGS ---
// Example: $1 gets you 100ml
mlPerDollar = 100
// Example: It takes 250ms to pump 1ml
msPerMl = 250
// Setup Bluetooth
bluetooth.startUartService()
basic.showString("CONNECT APP")