diff --git a/gpio/atsam4s/index.html b/gpio/atsam4s/index.html
new file mode 100644
index 0000000000000000000000000000000000000000..c422d089888f04cdef95cf86407c345a3c090f9e
--- /dev/null
+++ b/gpio/atsam4s/index.html
@@ -0,0 +1,35 @@
+<html>
+<head>
+<style>
+pre code {
+ background-color: #eee;
+ border: 1px solid #999;
+ display: block;
+ padding: 20px;
+}
+</style>
+
+
+</head>
+<body>
+
+<h1>ATSAM4S</h1>
+
+<figure>
+<img src='4s-pic.jpg' height=50%>
+<figcaption>Ring oscillator with ATSAM4S</figcaption>
+</figure>
+
+<pre>
+<code>
+code
+</code>
+</pre>
+
+
+
+<p><a href='../../index.html'>Back</a></p>
+
+</body>
+
+</html>
\ No newline at end of file
diff --git a/ring.json b/ring.json
index 6a83b0a7f9d056f040de5c5af0db9267957011d9..92010762029b19b8aeed6ab013212d1790cde3c9 100644
--- a/ring.json
+++ b/ring.json
@@ -63,6 +63,16 @@
}
],
"gpio":[
+ {
+ "name":"ATSAM4S",
+ "serial_number":"",
+ "subdirectory_path":"gpio/sam4s",
+ "dev_board_price":5.00,
+ "dev_board_sales link":"",
+ "ic_price":3.77,
+ "ic_sales_link":"",
+ "ring_period":0.19
+ },
{
"name":"M0, arduino",
"serial_number":"",