![]() ![]() Using an external signal, Enable/Key pin is used to change the HC-08 mode between data mode and command mode. This pin has an internal connection with the onboard LED which shows the working of HC05. It gives feedback to the controller about the connectivity of Bluetooth with another device. The state shows the current state of the Bluetooth. It is used to receive data from the microcontroller and transmits it through Bluetooth. This pin is a data receiving the pin in UART communication. The TX pin will be the data transfer pin of the module in UART. The HC-08 Bluetooth module uses UART communication to transmit data. Therefore, we should connect a power supply, HC05, and Raspberry Pi Pico ground pins to each other. Ground reference of both the microcontroller and HC-08 should be at the same level. Therefore, we can connect 5 volts power source to this pin. ![]() But I/O pins can withstand voltage of up to 5 volts. The operating voltage range is 3.3 volts. ![]() The table below briefly describes the functionality of each pin. You can modify the baud rate and the Bluetooth name via the AT command set. The main chip is cc2541F256 manufactured by TI, whose default data rate is 9600 baud and has a working voltage 3.3V to 6V. The HC-08 is a Bluetooth 4.0 module with 6 PIN baseboard, compatible with iPhone 4s/5/5s 6/6s and android phones 4.3 or later. More detailed information can be found here: Microsoft Word – HC-08 USER MANUAL V2.4_20161208.doc () We will use TX, RX pins of Raspberry Pi Pico to connect with the module. This Bluetooth device uses serial communication to transmit and receive data serially over standard Bluetooth radio frequency. To access Bluetooth, I used the SH-HC-08 Bluetooth to serial port module with the Raspberry Pi Pico. The bigger problem will be getting the Pico program to talk with the Bluetooth program that is running on your phone. HC-08Īlthough the Pico does not have a Bluetooth interface included with it, it is easy to add one. There are also versions 09 and 10 as well as 11 and 12 but I am not sure those last two are running Bluetooth. I moved up to the HC-08 and that is what this post covers. I first tried to use the HC-05 but my Android phone wouldn’t connect to it. One of the first is that there are a wide range of device generations available. There is quite a bit of information on connecting to the Pico from Bluetooth out there already, but when I tried to follow the steps, there were definitely some issues encountered. ![]()
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