From 2712a0bc4e3eb41d724fbaa6038371ec0a1d4004 Mon Sep 17 00:00:00 2001
From: dakkar <dakkar@thenautilus.net>
Date: Thu, 20 Aug 2020 18:21:03 +0100
Subject: we can sense quite fast!
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1ms between reads means a full scan of the 5×5 matrix takes ~25ms, so
about 40Hz sampling for the entire keyboard. Should be enough!
---
 esp32/lego-piano.ino | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/esp32/lego-piano.ino b/esp32/lego-piano.ino
index 81f75c9..d67a75a 100644
--- a/esp32/lego-piano.ino
+++ b/esp32/lego-piano.ino
@@ -17,6 +17,7 @@
  */
 
 int currentLed = 0;
+int lastSeen = 100;
 
 void setup() {
   Serial.begin(19200);
@@ -27,6 +28,7 @@ void setup() {
   pinMode(A1, INPUT);
   pinMode(A2, INPUT);
   currentLed = 0;
+  lastSeen = 100;
 }
 
 void tristate(int pin) {
@@ -82,12 +84,17 @@ void loop() {
   /* Serial.println(currentLed); */
 
   enableLed(currentLed);
-  delay(20);
+  delay(1);
   if (sense(currentLed)) {
-    Serial.print(currentLed);
-    Serial.println(" proximity!");
+    if (lastSeen != currentLed) {
+      lastSeen = currentLed;
+      Serial.print(currentLed);
+      Serial.println(" proximity!");
+    }
+  }
+  else if (lastSeen == currentLed) {
+    lastSeen = 100;
   }
 
   currentLed = (currentLed+1)%4;
-  delay(20);
 }
\ No newline at end of file
-- 
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