expand and fix digitalIO class

lib/SENECA/S50140_Driver.cpp

@@ -78,7 +78,7 @@ namespace drivers
         { // minimum m_lastRequest between requests
             delay(now - m_lastRequest);
         }
-        m_lastRequest = now;
+        m_lastRequest = millis();
     }
     
     const uint8_t S50140::getRegset()

lib/SENECA/S50140_Driver.h

@@ -13,7 +13,7 @@ namespace drivers
     private:
         const uint8_t c_maxRetries = 5;
         const uint8_t c_dataWords = 2;
-        const uint16_t c_minDelay = 200;
+        const uint16_t c_minDelay = 500;
 
         const uint16_t REG_V = 0x100C;
         const uint16_t REG_A = 0x1016;