I have 3 of those HC-05 Bluetooth devices. An old one and a two new ones. The old one was having issues so I decided to order a couple of new ones.
In addition to some flaky connection issues, the old one was not receiving data from the terminal. Mo data on the Txd pin as measured by my scope.
The old one started working for some unknown reason. I put the project aside for a bit and got the two new HC-05s in.
One of the HC-05s worked perfectly and continues to work. But the other is experiencing the same issue as my old HC-05. No data on the Txd pin when data is being transmitted from the terminal software. So I hooked up the old one. The old issue is back. No data on Txd.
What I noticed about the working on is TxD is always high until data is transmitted then the pin goes low.
The two that are not working, the TxD pin is always low.
I find it a bit odd that I have two HC05s purchased at different times. Makes me think I might be doing something wrong but then again one works.
I have En tied high. Also tried letting it float. Vcc is at 5V. Nothing other than my scope probe is on Txd pin.
In addition to some flaky connection issues, the old one was not receiving data from the terminal. Mo data on the Txd pin as measured by my scope.
The old one started working for some unknown reason. I put the project aside for a bit and got the two new HC-05s in.
One of the HC-05s worked perfectly and continues to work. But the other is experiencing the same issue as my old HC-05. No data on the Txd pin when data is being transmitted from the terminal software. So I hooked up the old one. The old issue is back. No data on Txd.
What I noticed about the working on is TxD is always high until data is transmitted then the pin goes low.
The two that are not working, the TxD pin is always low.
I find it a bit odd that I have two HC05s purchased at different times. Makes me think I might be doing something wrong but then again one works.
I have En tied high. Also tried letting it float. Vcc is at 5V. Nothing other than my scope probe is on Txd pin.