From 3c05ccf9ce86fcdac53cb08c20a3ba530119d170 Mon Sep 17 00:00:00 2001
From: Kohei Watanabe <kou029w@gmail.com>
Date: Tue, 15 Oct 2019 20:38:53 +0900
Subject: [PATCH] docs: fix undefined variable

---
 README.md | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 0aa64ab..4125984 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,8 @@ GPIO access with Node.js
 
 ```js
 const { requestGPIOAccess } = require("@notweb/gpio");
+const { promisify } = require("util");
+const sleep = promisify(setTimeout);
 
 async function main() {
   const gpioAccess = await requestGPIOAccess();
@@ -14,8 +16,10 @@ async function main() {
   await port.export("out");
 
   for (;;) {
-    await port.write(value);
-    await new Promise(resolve => setTimeout(resolve, 1e3));
+    await port.write(1);
+    await sleep(1000);
+    await port.write(0);
+    await sleep(1000);
   }
 }