Swap logic levels for circuit with pullup.

webbot.html

@@ -44,11 +44,17 @@
   var white =
     'data:image/gif;base64,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';
 
+//assuming the use of a photo sensitive resistor between the analog pin and ground,
+//and an internal or external pullup resistor to the power rail, 
+//a white screen will cause a low voltage, and a black screen will allow the voltage to rise
+  var logic1 = black
+  var logic0 = white
+
   var delay = 60;
   var count = 0;
 
   function sendI2Cscl(value) {
-    document.images["scl"].src = value ? white : black;
+    document.images["scl"].src = value ? logic1 : logic0;
     return new Promise((resolve) => {
       setTimeout(() => {
         resolve();
@@ -57,7 +63,7 @@
   }
 
   function sendI2Csda(value) {
-    document.images["sda"].src = value ? white : black;
+    document.images["sda"].src = value ? logic1 : logic0;
     return new Promise((resolve) => {
       setTimeout(() => {
         resolve();
@@ -66,7 +72,7 @@
   }
 
   function sendLatch(value) {
-    document.images["lat"].src = value ? white : black;
+    document.images["lat"].src = value ? logic1 : logic0;
     return new Promise((resolve) => {
       setTimeout(() => {
         resolve();