Bluetooth Serial Terminal Windows 10 – CoolTerm is a user-friendly terminal for serial communication with hardware connected to your computer via serial ports.
CoolTerm is a free/donation software developed by Roger Meier, and is available for Windows/Mac/Linux devices. This makes CoolTerm a popular and affordable choice for users who need a simple and convenient terminal software solution.
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As you can guess, serial communication is used to send and receive data to peripheral devices. What makes serial communication different is that data is sent one at a time through a single channel. In contrast, parallel communication sends many bits together, over a few parallel channels.
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If you are unfamiliar with serial communication and would like to know more, please visit our comprehensive beginner’s guide – RS232 vs TTL: A Beginner’s Guide to Serial Communication.
Serial communication continues to be used around us today. Compared to parallel communication (4, 8 or 64-bit), serial communication is popular in embedded systems due to its lower cost and better long-distance transmission.
For software developers and engineers, sometimes we need to monitor data sent between our devices and computers. This will help us ensure that everything is working as expected. In this case, we should use a serial terminal like CoolTerm to test sending and receiving data.
Arduino is a popular microcontroller platform that uses serial port communication. In this section, I will show you how to use CoolTerm to easily monitor some sensor data in real time.
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Today’s example will involve an Arduino Uno board with an HC-SR94 Ultrasonic sensor. I’ve uploaded a simple image from the Arduino Project Hub to the Arduino to use the sensor as a range finder, and return the detected distance.
With the Arduino prepared and plugged into our computer, open CoolTerm and select Options. Next, select the appropriate port for my Arduino, and make sure the baud rate is 9600.
The baud rate defines how fast data is transmitted between devices. It is important to compare the baud rate on the terminal with the one set on the Arduino. Otherwise, our data will not be collected and interpreted correctly.
After choosing the right option, go back to the main screen and click “Connect”. This will begin transferring data between the Arduino and the computer, and the data will begin to appear. We can choose to disconnect when we are done stopping the transfer.
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Sometimes, we may want to analyze the data we collect further. In this case, we can proceed with Connection > Call to Text / Binary File > Start… . This allows us to save our data in a simple txt file for further analysis on our favorite platforms.
CoolTerm is not only good for tracking serial communications. Other top features of CoolTerm include but are not limited to:
In this article, we introduce CoolTerm and how it can help us monitor serial port communication and more. If you want to learn more about CoolTerm, here are some more resources for your exploration.
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A serial port on a PC can be wired to the serial port of another PC. If from both wires the TX pin from one PC is connected to the RX pin of the other PC the PCs can communicate.
Both computers must be set to the same transfer speed, baud rate. The baud rate is the number of bits per second sent over a wire.
The standard speed is 9600 baud. In this row the other bits are controls. Baud 9600 is approximately 1000 bytes per second.
The HM-10 Bluetooth module uses a C2541 chip for converting signals into a series of bits.
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There are similar radio modules, known as HC-12, which have a range of up to 1000 meters. (See example here)
Two HC-12 modules can be used instead of a long cable between two devices. It’s easy to work but you can’t use the phone.
HM-10 or similar BLE module, like JDY-23, can be used for Android and Apple phones. HC-0x modules, like the popular HC-05, cannot be used with Apple devices. So the HM-10 module is a good choice.
This page explains how to use the phone to communicate with the Arduino software to send commands and receive results.
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Communication with the Bluetooth module is done through the serial pin RX and TX on the Arduino and the Bluetooth module.
The Softwareserial.h library makes it possible to use pins other than the standard 0 and 1 pins that are also used to load software.
The code between #ifdef and #endif is included in the program or not if BLUETOOTHMOD is not defined.
One can disconnect the two pins 6&7 and connect a BLE module to pin 0 & 1, serial port of Arduino. This maintains a library and a bit of code that you should use to read and write to pins 6&7. But … the BLE module prevents software uploading to the Arduino and the module must be disabled before all uploads.
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An Arduino can be connected with a USB cable to a PC and controlled by a serial terminal program such as the one in Arduino IDE or Termite.
With the serial terminal software one can send a command to the receiver which can be used in the Arduino software to do something.
In the terminal window, a list from the Arduino is displayed and commands can be entered in the “Enter message” field at the bottom of the window.
If the BT part is connected to pin 0&1 one can see the data simultaneously on the connected phone
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//0 1 2 3 4 5 //12345678901234567890123456789012345678901234567890 character menu[][42] = { // menu[][nn] nn, “D Enter the largest text in the menu”. Date DDDMMYYY (D25122021″, “I am releasing this info menu”, “R Action R”, “T Set time as THHMMSS (T071500)”, “Jan 2022” });
A working INO file for Arduino can be found at the bottom of this page and as a file here: BLEHM-10Menu.ino
No apps or software can communicate with HM-10 BLE devices. Below is one for IOS and one for Android. If HM-10 or JDY-23 (C2541 module is used) you need one of the programs mentioned below. For my Apple IOS the program “BLEserial HM-10” from the app store can be used.
Enter the command in the message box you clicked to send or wait for the output of your program to appear in the console window.
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The easiest way to modify or program the HM-10 module is to use the FTDI software. Connect 3.3V to GND and TX to RX and RX to TX. Open the monitor as Ant or access the Arduino Serial monitor and open the serial port Type AT on the monitor and OK should appear in the window as the output module AT + NAME followed by the name you want for the module in the new ad. name AT+HELP lists the following commands: ******************************************* * ******************** * Command Details * * ——————- —— —— ————————————- * * AT Check as a function of command terminal is correct * * AT+RESET Software restart * * AT+VERSION Get firmware version, bluetooth, HCI and LMP * * AT+HELP List all commands * * AT+Name Get/Set internal device name * * AT+ PIN Get/Set pairing PIN code * * AT+PASS Get/Set pairing PIN code * * AT+BAUD Get/Set baud rate * * AT+LADDR Get local bluetooth address * * AT+ ADDR Get local bluetooth address * * TO+SOURCE+Restore factory default * * AT+Restore Restore factory default * * AT+STATE Get current state * * AT+PWRM Get/Set power on state (low power)* * AT+POWE Get/Set RF transmitter power * * AT+SLEEP sleep mode * * AT+ROLE Get/Set current role. * * END + Get/Set UART readiness bit. * * AT+Stop Get/Set UART stop bit. * * AT + Start Program to start the operation. * * AT+IMME Enter the wait command at power up. * * AT + IBEA Switch iBeacon mode. * * AT+IBE0 Set iBeacon UUID 0. * * AT+IBE1 Set iBeacon UUID 1. * * AT+IBE2 Set iBeacon UUID 2. * * AT+IBE3 Set iBeacon UUID 3. * * AT+MARJ Set iBeacon MARJ. * AT + MINO Set iBeacon MINO. * * AT+MEA Set iBeacon MEA. * * AND + NOTE
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