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--- arduino:arduino_crash_course:analog_input [2012/11/12 18:42] – [Analog Input] mithat
+++ arduino:arduino_crash_course:analog_input [2017/12/06 01:17] – [Night light] mithat
@@ Line 1: / Line 1: @@
 ====== Analog Input ======
-As we have seen, an Arduino digital input is one that have one of two states: HIGH or LOW. Most Arduino implementations also permit you to connect an input whose value can be any value between 0 volts and (by default) the power-supply voltage and then convert the input level to an integer value between 0 an 1204. The Arduino literature refers to these as "analog" inputs. The process of converting a real analog signal to a digital number is called **analog to digital conversion** (**ADC**).
+As we have seen, an Arduino digital input is one that have one of two states: HIGH or LOW. Most Arduino implementations also permit you to connect an input whose value can be any value between 0 volts and (by default) the power-supply voltage, and then convert the input level to an integer value between 0 an 1023. The Arduino literature refers to these as "analog" inputs. The process of converting a physical analog signal to a digital representation is called **analog to digital conversion** (**ADC**).
-Consult the documentation for your specific Arduino board to detmine which pins support analog input.
+Consult the documentation for your specific Arduino board to determine which pins support analog input. On the Arduino UNO, inputs A0 through A5 can be used as analog inputs.
 ===== Night light =====
@@ Line 10: / Line 10: @@
 <WRAP center round tip 60%>
-CdS cells are notoriously tweaky devices. A lot of experimentation with your particular cell will probably be required to see what your circuit is actually doing--quite likely requiring the use of the serial communication to report the ADC values (see [[light_meter|this]] for an example).
+CdS cells are notoriously tweaky devices. A lot of experimentation with your particular cell will probably be required to see what your circuit is actually doing---quite likely requiring the use of the serial communication to report the ADC values (see [[light_meter|this]] for an example).
-There are more reliable and calibrated light-level sensors available that may be a better (but significanly more expensive!) choice if you wish not to deal with the tweakiness of Cds cells.
+There are more reliable and calibrated light-level sensors available that may be a better (but significantly more expensive!) choice if you wish not to deal with the tweakiness of Cds cells.
 </WRAP>
+FIXME We need a circuit diagram
 <file c NightLight.ino>
@@ Line 32: / Line 34: @@
 void loop() {
-  lightLevel = analogRead(inputPin);  // get a reading
+  lightLevel = analogRead(inputPin);  // get an analog reading
   if (lightLevel <= lightThreshold)