diff --git a/sensehat.js b/sensehat.js
index 30714f0..8456cfb 100644
--- a/sensehat.js
+++ b/sensehat.js
@@ -27,7 +27,7 @@ read_all_leds()
 let zhao_server_errors = 0
 
 const job = new CronJob(
-    '*/1 * * * * *',
+    '*/3 * * * * *',
     async () => {
         // 测试 http://zhao 的连通性
         request('http://zhao', (err, res, body) => {