More of the introduction page. #48

website/content/posts/introducing-the-goodwatch.md

@@ -20,16 +20,37 @@ I built the damned thing, and it's called the GoodWatch.
 
 I began by disassembling the Casio 3208 watch module from a Casio
 CA-53W calculator watch, and measuring its circuit board which you can
-see on the right.
+see on the right.  Pieces of sticky note over a pad would cause segments
+to fail, allowing me to learn the pinout before making my own board,
+shown on the left.
 
 {{% img src="images/gw10-lcdpinout.jpg" w="600" %}}
 
-Having the measurements for the
+I then assembled a watch with this board, writing firmware libraries
+for the LCD, keypad, and power management.
 
-{{% img src="images/gw10-3d.jpg" w="600" %}}
 
 {{% img src="images/gw10-assembly.jpg" w="600" %}}
 
+After that, it wasn't much work to toss together applications for the
+clock, calendar, timer, RPN calculator, and hex editor.  Each
+application consists of a quick bit of C code, with handler functions
+for entry, exit, and refreshing the screen.
+
+{{% img src="images/gw10-lcd.jpg" w="600" %}}
+
+Having functional wristwatches with a built-in disassembler was handy,
+but the GoodWatch10 lacked a radio.  Another round of PCB
+manufacturing delivered the GoodWatch20, with a functional radio
+transceiver filtered for the 70cm (433MHz band).  Out of band
+operation also works, with the expected losses to filtering.
+
+{{% img src="images/gw20-pins.jpg" w="600" %}}
+
+Full hardware CAD and source code are available on Github.  PCBs will
+be available soon.
+
+[https://github.com/travisgoodspeed/goodwatch/](https://github.com/travisgoodspeed/goodwatch/)
 
 
 Your neighbor,