diff --git a/Makefile b/Makefile
index 4e1247bd..f724173f 100644
--- a/Makefile
+++ b/Makefile
@@ -611,7 +611,7 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=challenger-rp2040    examples/blinky1
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=trinkey-qt2040      examples/adc_rp2040
+	$(TINYGO) build -size short -o test.hex -target=trinkey-qt2040      examples/temp
 	@$(MD5SUM) test.hex
 	# test pwm
 	$(TINYGO) build -size short -o test.hex -target=itsybitsy-m0        examples/pwm
diff --git a/src/examples/adc_rp2040/adc.go b/src/examples/adc_rp2040/adc.go
deleted file mode 100644
index ef0e2d40..00000000
--- a/src/examples/adc_rp2040/adc.go
+++ /dev/null
@@ -1,49 +0,0 @@
-// Reads multiple rp2040 ADC channels concurrently. Including the internal temperature sensor
-
-package main
-
-import (
-	"fmt"
-	"machine"
-	"time"
-)
-
-type celsius float32
-
-func (c celsius) String() string {
-	return fmt.Sprintf("%4.1f℃", c)
-}
-
-// rp2040 ADC is 12 bits. Reading are shifted <<4 to fill the 16-bit range.
-var adcReading [3]uint16
-
-func readADC(a machine.ADC, w time.Duration, i int) {
-	for {
-		adcReading[i] = a.Get()
-		time.Sleep(w)
-	}
-}
-
-func main() {
-	machine.InitADC()
-	a0 := machine.ADC{machine.ADC0} // GPIO26 input
-	a1 := machine.ADC{machine.ADC1} // GPIO27 input
-	a2 := machine.ADC{machine.ADC2} // GPIO28 input
-	t := machine.ADC_TEMP_SENSOR    // Internal Temperature sensor
-	// Configure sets the GPIOs to PinAnalog mode
-	a0.Configure(machine.ADCConfig{})
-	a1.Configure(machine.ADCConfig{})
-	a2.Configure(machine.ADCConfig{})
-	// Configure powers on the temperature sensor
-	t.Configure(machine.ADCConfig{})
-
-	// Safe to read concurrently
-	go readADC(a0, 10*time.Millisecond, 0)
-	go readADC(a1, 17*time.Millisecond, 1)
-	go readADC(a2, 29*time.Millisecond, 2)
-
-	for {
-		fmt.Printf("ADC0: %5d ADC1: %5d ADC2: %5d Temp: %v\n\r", adcReading[0], adcReading[1], adcReading[2], celsius(float32(t.ReadTemperature())/1000))
-		time.Sleep(1000 * time.Millisecond)
-	}
-}
diff --git a/src/examples/temp/temp.go b/src/examples/temp/temp.go
new file mode 100644
index 00000000..92f147fb
--- /dev/null
+++ b/src/examples/temp/temp.go
@@ -0,0 +1,23 @@
+// Read the internal temperature sensor of the chip.
+
+package main
+
+import (
+	"fmt"
+	"machine"
+	"time"
+)
+
+type celsius float32
+
+func (c celsius) String() string {
+	return fmt.Sprintf("%4.1f℃", c)
+}
+
+func main() {
+	for {
+		temp := celsius(float32(machine.ReadTemperature()) / 1000)
+		println("temperature:", temp.String())
+		time.Sleep(time.Second)
+	}
+}
diff --git a/src/machine/machine_rp2040_adc.go b/src/machine/machine_rp2040_adc.go
index 97a54c67..38ba4cf8 100644
--- a/src/machine/machine_rp2040_adc.go
+++ b/src/machine/machine_rp2040_adc.go
@@ -17,8 +17,8 @@ const (
 	adc0_CH ADCChannel = iota
 	adc1_CH
 	adc2_CH
-	adc3_CH         // Note: GPIO29 not broken out on pico board
-	ADC_TEMP_SENSOR // Internal temperature sensor channel
+	adc3_CH       // Note: GPIO29 not broken out on pico board
+	adcTempSensor // Internal temperature sensor channel
 )
 
 // Used to serialise ADC sampling
@@ -75,19 +75,17 @@ func (a ADC) GetADCChannel() (c ADCChannel, err error) {
 	return c, err
 }
 
-// Configure sets the channel's associated pin to analog input mode or powers on the temperature sensor for ADC_TEMP_SENSOR.
+// Configure sets the channel's associated pin to analog input mode.
 // The powered on temperature sensor increases ADC_AVDD current by approximately 40 μA.
 func (c ADCChannel) Configure(config ADCConfig) error {
 	if config.Reference != 0 {
 		adcAref = config.Reference
 	}
-	if p, err := c.Pin(); err == nil {
-		p.Configure(PinConfig{Mode: PinAnalog})
-	}
-	if c == ADC_TEMP_SENSOR {
-		// Enable temperature sensor bias source
-		rp.ADC.CS.SetBits(rp.ADC_CS_TS_EN)
+	p, err := c.Pin()
+	if err != nil {
+		return err
 	}
+	p.Configure(PinConfig{Mode: PinAnalog})
 	return nil
 }
 
@@ -112,13 +110,16 @@ func (c ADCChannel) getVoltage() uint32 {
 }
 
 // ReadTemperature does a one-shot sample of the internal temperature sensor and returns a milli-celsius reading.
-// Only works on the ADC_TEMP_SENSOR channel. aka AINSEL=4. Other channels will return 0
-func (c ADCChannel) ReadTemperature() (millicelsius uint32) {
-	if c != ADC_TEMP_SENSOR {
-		return
+func ReadTemperature() (millicelsius int32) {
+	if rp.ADC.CS.Get()&rp.ADC_CS_EN == 0 {
+		InitADC()
 	}
+
+	// Enable temperature sensor bias source
+	rp.ADC.CS.SetBits(rp.ADC_CS_TS_EN)
+
 	// T = 27 - (ADC_voltage - 0.706)/0.001721
-	return (27000<<16 - (c.getVoltage()-706<<16)*581) >> 16
+	return (27000<<16 - (int32(adcTempSensor.getVoltage())-706<<16)*581) >> 16
 }
 
 // waitForReady spins waiting for the ADC peripheral to become ready.