Using Analog Multiplexer CD74HC4067 with Circuit Playground Express

I am working on a school project requiring the use of the circuit playground express. I am trying to connect a bunch of external photocells to the cpx so that it will change the color of its lights everytime any individual photocell detects darkness. I was trying to use an analog multiplexer for this, but I can't get it to work. I've attatched the code... am using adafruit's makecode environment.

    let dark = false
    let value = 0
    let numChannels = 1
    let darkThreshold = 500
    let muxPin = pins.A1.analogRead()
    let S0 = pins.A2.analogRead()
    let S1 = pins.A3.analogRead()
    let S2 = pins.A4.analogRead()
    let S3 = pins.A5.analogRead()
    
    function setChannel (ch: number) {
        if (ch % 2 == 1) {
            pins.A2.digitalWrite(true)
        } else {
            pins.A2.digitalWrite(false)
        }
        if (ch / 2 % 2 == 1) {
            pins.A3.digitalWrite(true)
        } else {
            pins.A3.digitalWrite(false)
        }
        if (ch / 4 % 2 == 1) {
            pins.A4.digitalWrite(true)
        } else {
            pins.A4.digitalWrite(false)
        }
        if (ch / 8 % 2 == 1) {
            pins.A5.digitalWrite(true)
        } else {
            pins.A5.digitalWrite(false)
        }
    }
    
    forever(function () {
        for (let index = 0; index <= 16; index++) {
            let channel = 0
            index += 1
            setChannel(channel)
            value = pins.A1.analogRead()
            if (value < 200) {
                dark = true
            }
            console.log(value)
            pause(1000)
            if (dark) {
                light.setAll(0xffff00)
            } else {
                light.setAll(0xff0000)
            }
        }
    })

My wiring is similar to this, but with the circuit playground:

.

I have sig plugged into pin A1 and S0-S3 plugged into A0, A2, A3 and A4. My photocell wiring looks like this:

.

So far I have only tried to connect 1 photocell to it and then will add more from there. It is currently always reading dark.