Hi, i have a question about Arduino Nano and bluetooth module HC-05. I have an Arduino nano, HC-05 and i cant get response from serial monitor.
I have connection (screenshot) + code (screenshot) and when i turn the power and upload code from Arduino IDE and hold button on HC-05 to enter AT mode i get slowly blinking HC-05. But when i type "AT" into serial monitor it only blinks once RX diode on Arduino. So im begging for some tips. Thanks for helping!!!
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Hello @tuhacek
I think you will find this relevant to the problem you are having:
38400 is very optimistic for softwareserial on a small low-speed micro. Try 9600 bps
Also, depending on what you’re trying to do, Serial.primt might work better.
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Ignore the above, 38400 is required for AT mode with HC-05
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I believe you have wired Rx/Rx. You need Tx to Rx
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Nano is capable of powering Bluetooth, why make things more difficult?
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It is good practice to use a 1k/2k voltage divider in Arduino Tx line.
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I'm sure the code is wrong.
Check the Martyn Currey website for proper code and wiring.
HC-05 module RX pin might use 3v3 logic level.
I think your wiring is incorrect. The TX pin of Arduino need to be connected to RX pin of HC-05, and vice versa.
You can test the wiring by running simple code in Arduino HC-05 tutorial
ok, i see thanks!!
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