From 8c543428604c5ab5a0b83ef2de41152e3bfd1e9a Mon Sep 17 00:00:00 2001 From: Travis Goodspeed Date: Sun, 26 Nov 2017 15:27:30 -0500 Subject: [PATCH] More of the introduction page. #48 --- .../posts/introducing-the-goodwatch.md | 27 ++++++++++++++++--- 1 file changed, 24 insertions(+), 3 deletions(-) diff --git a/website/content/posts/introducing-the-goodwatch.md b/website/content/posts/introducing-the-goodwatch.md index 3f62395..718b69c 100644 --- a/website/content/posts/introducing-the-goodwatch.md +++ b/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,