Update ADC example for MNTM-008

js/adc/sensor.js

@@ -9,15 +9,16 @@
 // Step 1. Connect a NTC Thermistor (R0:2K, B:3470K) to 3.3V and Pin A7.
 // Step 2. Connect a 2.2K Resistor to Pin A7 and GND.
 
-// Requires MNTM-005 (or current Momentum dev build)
+// Requires MNTM-008 (or current Momentum dev build)
 
+// NOTE: The "gpio" module requires that "event_loop" be loaded first.
+let eventLoop = require("event_loop");
 let gpio = require("gpio");
 let Math = require("math");
 
-gpio.init("PA7", "analog", "no");
-
+let tempSensor = gpio.get("PA7");
 // 2048mV reference voltage
-gpio.startAnalog(2048);
+tempSensor.init({ direction: "in", inMode: "analog" });
 
 function mvToSensorResistance(millivolts) {
   let Rfixed = 2200; // 2200 ohm fixed resistor
@@ -30,38 +31,37 @@ function mvToSensorResistance(millivolts) {
 }
 
 function resistanceToCelsius(rsensor) {
-    // B value of the thermistor
-    let B = 3470; 
-    // Reference temp (25°C in Kelvin) 
-    let T0 = 273.15 + 25; 
-    // Resistance of the thermistor at T0 (in ohms)
-    let R0 = 2000; 
-    // B or β parameter equation 
-    // from https://en.wikipedia.org/wiki/Thermistor
-    let invT = (1 / T0) + (1 / B) * Math.log(rsensor/R0); 
-    let tempK = 1 / invT;
-    // Convert Kelvin to Celsius
-    let tempC = tempK - 273.15;
-    return tempC;
+  // B value of the thermistor
+  let B = 3470;
+  // Reference temp (25°C in Kelvin) 
+  let T0 = 273.15 + 25;
+  // Resistance of the thermistor at T0 (in ohms)
+  let R0 = 2000;
+  // B or β parameter equation 
+  // from https://en.wikipedia.org/wiki/Thermistor
+  let invT = (1 / T0) + (1 / B) * Math.log(rsensor / R0);
+  let tempK = 1 / invT;
+  // Convert Kelvin to Celsius
+  let tempC = tempK - 273.15;
+  return tempC;
 }
 
 // Function to print 1 digits after decimal written by ChatGPT 4o.
 function formatTemperature(temp) {
-    let roundedTemp = Math.floor(temp * 10 + 0.5) / 10; // Round to one decimal place
-    let intPart = Math.floor(roundedTemp); // Integer part
-    let fracPart = Math.floor((roundedTemp - intPart) * 10); // Fractional part
-    return to_string(intPart) + '.' + to_string(fracPart);
+  let roundedTemp = Math.floor(temp * 10 + 0.5) / 10; // Round to one decimal place
+  let intPart = Math.floor(roundedTemp); // Integer part
+  let fracPart = Math.floor((roundedTemp - intPart) * 10); // Fractional part
+  return intPart.toString() + '.' + fracPart.toString();
 }
 
-for (let i=0; i<50; i++) {
-  let mv = gpio.readAnalog("PA7");
+for (let i = 0; i < 50; i++) {
+  let mv = tempSensor.read_analog();
   let sensor_resistance = mvToSensorResistance(mv);
   let tempC = resistanceToCelsius(sensor_resistance);
-  let msg = to_string(mv) + " mV:";
-  msg = msg + to_string(sensor_resistance) + " Ohms:";
+  let msg = mv.toString() + " mV:";
+  msg = msg + sensor_resistance.toString() + " Ohms:";
   msg = msg + formatTemperature(tempC) + " C";
   print(msg);
   delay(1000); // 1 second
 }
 
-gpio.stopAnalog();