1 files changed, 9 insertions, 22 deletions
diff --git a/api_layers/firmware/esp32_stringPot/esp32_stringPot.ino b/api_layers/firmware/esp32_stringPot/esp32_stringPot.ino
index 9edda7b..3fde958 100644
--- a/api_layers/firmware/esp32_stringPot/esp32_stringPot.ino
+++ b/api_layers/firmware/esp32_stringPot/esp32_stringPot.ino
@@ -8,6 +8,14 @@
 
   Required library: esp32 by Espressif Systems
 
+  Calibration:
+    1. Flash board with calibrationMODE = true.
+    2. Set to position #1 and record actual position (measuredRange[0]) and
+       output position (readingRange[0]).
+    3. Move to position #2 and record actual position (measuredRange[1])
+       and output position (readingRange[1]).
+    4. Flash board with calibrationMODE = false.
+
   ─────────────────────────────────────────────────────────────────────────
  */
 
@@ -31,7 +39,6 @@ float butter_b0, butter_b1, butter_b2, butter_a1, butter_a2;
 float butter_z1 = 0.0, butter_z2 = 0.0;
 
 void setup() {
-
   Serial.begin(115200);
 
   while (!Serial) {
@@ -39,15 +46,13 @@ void setup() {
   }
 
   analogReadResolution(12);
+  computeButterworthCoeffs(butterworth_cutoffHz, butterworth_sampleHz);
   if (calibrationMODE == false){
     computeCalibrationParameters(measuredRange, readingRange);
   }
-  computeButterworthCoeffs(butterworth_cutoffHz, butterworth_sampleHz);
 }
 
 void loop() {
-  handleSerialCommands();
-
   unsigned long currentTime = micros();
 
   if (currentTime - lastSampleTime >= sampleInterval) {
@@ -100,21 +105,3 @@ float butterworthLowPass(float newSample) {
   butter_z2 = butter_b2 * newSample - butter_a2 * output;
   return output;
 }
-
-void handleSerialCommands() {
-  // "C:<cutoffHz>\n" sets Butterworth cutoff frequency, e.g. "C:15.0\n"
-  if (Serial.available() > 0) {
-    String line = Serial.readStringUntil('\n');
-    line.trim();
-
-    if (line.startsWith("C:")) {
-      float newCutoff = line.substring(2).toFloat();
-      if (newCutoff > 0.0 && newCutoff < butterworth_sampleHz / 2.0) {
-        butterworth_cutoffHz = newCutoff;
-        computeButterworthCoeffs(butterworth_cutoffHz, butterworth_sampleHz);
-        butter_z1 = 0.0;
-        butter_z2 = 0.0;
-      }
-    }
-  }
-}