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draft/overlay/rtc.txt

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+<!--
+ ---
+ name: Adafruit PiRTC 
+ class: board
+ type: RTC
+ formfactor: Custom
+ manufacturer: Adafruit
+ description: Add a simple RTC to your pi
+ url: https://learn.adafruit.com/adding-a-real-time-clock-to-raspberry-pi/set-up-and-test-i2c
+ buy: https://www.adafruit.com/products/3386
+ image: rtc.png
+ pincount: 6
+ eeprom: no
+ power:  
+   '1':
+
+
+     
+ ground:
+    '6':
+     
+    
+ pin:
+   '3':
+     mode:SDA
+   '5':
+     mode:SCL
+  
+ i2c:
+  '0x68':
+    name: PCF8523
+    device: PCF8523
+
+   
+ -->
+#Adafruit PiRTC
+
+This is a great battery-backed real time clock (RTC) that allows your Raspberry Pi project to 
+keep track of time if the power is lost. Perfect for data-logging, clock-building, time-stamping, 
+timers and alarms, etc. Equipped with PCF8523 RTC, it works great with the Raspberry Pi and has native 
+kernel support.
+
+This RTC will keep the time for about 5 years. The PCF8523 is simple and inexpensive but not a high 
+precision device. It may lose or gain a second or two per day.