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Reviewed in the United States on February 1, 2024
All of them worked great. The 3 unit price is hard to beat.
R. Cheek
Reviewed in the United States on August 6, 2023
Ordered a three pack. Of the three, none every actually worked, one lit up for a few minutes but would not go into programming mode. The other two didn't ever work. Junk! I was able to setup the devices with the AT commands, when when I connect to another bluetooth device the connection is broken in 10-20 seconds. All three behaved the same way. Previous HC-05 BT interfaces worked in this application OK.
Customer
Reviewed in the United States on June 5, 2022
Product does not initialize or flash lights when connected to 3.3 volts DC.One item paired then reset during connection.Save money do not purchase these module.Returning these modules not worth effort I will never again order these items.Title them as bad experience with Amazon.
MV
Reviewed in the United States on May 27, 2022
seller sold me dead HC-05 Bluetooth module, watch out it's getting bad buying electronics around here.
Dario H
Reviewed in the United States on March 24, 2022
Beware, the item delivered is not the same as in the listing and is different from every other tutorial on the internet. I gave up trying to use after the second one wouldn’t even turn on.
Customer
Reviewed in the United States on September 28, 2021
Its alright could only get the light to turn on once on the board but that might just be a bad soldering job.
Joseph Mattioni
Reviewed in the United States on March 30, 2021
I managed to damage only one of the 3 modules before figuring this out. You cannot connect the RXD pin of this module directly to a pin on the Arduino board. It will cause damage to the HC-05 serial interface. On the back of the board next to the RXD pin it says "LEVEL 3.3V". Arduino pins are 5V high. I found that I could just use a 1K resistor to connect to the HC-05 RXD pin to the Arduino TX pin without damaging the HC-05. The TXD can connect directly to the Arduino RX pin.Also, there's apparently a lot of slightly different HC-05s out there. On this one you get into AT command mode by holding down the button on the board and THEN applying power to it. The LED will blink at a 2sec interval when it's in AT command mode.
jeremy m
Reviewed in the United States on March 23, 2021
If you know what to do you can program them with AT commands and get them to talk to each other, but as far as actually using them, forget it. They tout these as serial devices, except they don't transmit or receive any serial data when configured like they should be. I spent days playing with these and had no luck. The same goes for HC-12 modules, those are even worse. My only solution to wirelessly send Serial data (one way) was by programming an ESP8266 with Esp-link and using a TCP serial client on the other computer. I bet 1000 smackers you won't find anyone who can send serial data 2-way using RX/TX serial data. Sure, you can send short messages back and forth between the modules, but actually sending serial data (from like a modem device) won't happen.
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