# Hc-05+arduino, connects to the device, but can not send AT-commands **URL:** \ **Category:** Programming\ **Created:** [June 24, 2023, 1:59pm UTC](https://forum.arduino.cc/t/hc-05-arduino-connects-to-the-device-but-can-not-send-at-commands/1141236 "2023-06-24T13:59:38Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![groundFungus](https://avatars.discourse-cdn.com/v4/letter/g/73ab20/32.png) [@groundFungus](https://forum.arduino.cc/u/groundFungus)\ **Post date:** [June 24, 2023, 2:47pm UTC](https://forum.arduino.cc/t/hc-05-arduino-connects-to-the-device-but-can-not-send-at-commands/1141236/2 "2023-06-24T14:47:05Z")
Are you trying to send AT commands to the HC05 from the phone via Bluetooth? My tutorial on putting the HC05 into AT mode may be of interest. > [@Setting HC05 (ZS-040) to AT mode \[code example\]](https://forum.arduino.cc/t/setting-hc05-zs-040-to-at-mode/1059616): > > I have used the following instruction to put HC05 (ZS-040) modules into AT mode to make changes to your setup. Also at least 3 other members have used this instruction with success. This instruction is for the HC05 module marked ZS-040 connected to an Arduino Uno, Nano or any mega328 based board. Connect the HC05 as shown in [the Martyn Currey page on AT mode](http://www.martyncurrey.com/arduino-with-hc-05-bluetooth-module-at-mode/) for the HC05 (ZS-040) in my prior post. HC05 TX to Arduino pin 2 and HC05 RX to Arduino pin 3 (through voltage divider). To change the b… --- _[View the full topic](https://forum.arduino.cc/t/hc-05-arduino-connects-to-the-device-but-can-not-send-at-commands/1141236)._