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+# Lecture notes
+Digital - Either 0 or 1
+Analog - Read voltage
+
+rule of thumb for signal measuring. At least sample at double the frequency that is being sampled from the sensor.  
+
+![alt text](image.png)
+
+GPIO
+
+Low - 0 to 1/3 vcc
+High 2/3 to 1 vcc
+
+
+
+Signal from a DHT
+
+![alt text](image-1.png)
+
+![alt text](image-2.png)
+
+![alt text](image-3.png)
+ds18b20
+
+
+![alt text](image-4.png)
+
+![alt text](image-7.png)