Merge pull request #7 from vanniaz/master

Corrected scale factors and added ESP32

Author: pilotak

MCP3X21.cpp

@@ -66,13 +66,13 @@ MCP3021::MCP3021(uint8_t slave_adr):
 }
 
 uint16_t MCP3021::toVoltage(uint16_t data, uint32_t vref) {
-    return (vref * data / 1023);
+    return (vref * data / 1024);
 }
 
 MCP3221::MCP3221(uint8_t slave_adr):
     MCP3X21(slave_adr) {
 }
 
 uint16_t MCP3221::toVoltage(uint16_t data, uint32_t vref) {
-    return (vref * data / 4095);
+    return (vref * data / 4096);
 }

examples/MCP3021/MCP3021.ino

@@ -9,7 +9,7 @@ MCP3021 mcp3021(address);
 void setup() {
     Serial.begin(115200);
 
-#if defined(ESP8266)
+#if defined(ESP8266) || defined(ESP32)
     Wire.begin(SDA, SCL);
     mcp3021.init(&Wire);
 #else

examples/MCP3221/MCP3221.ino

@@ -9,7 +9,7 @@ MCP3221 mcp3221(address);
 void setup() {
     Serial.begin(115200);
 
-#if defined(ESP8266)
+#if defined(ESP8266) || defined(ESP32)
     Wire.begin(SDA, SCL);
     mcp3221.init(&Wire);
 #else