Psoc 4: Wireless Programming

About the project

Instead of programming CY8CKIT-049-42xx PSoC 4 through USB, program it wirelessly via Bluetooth-UART link with HC-05 module.

Project info

Difficulty: Easy

Platforms: Cypress

Estimated time: 1 hour

License: MIT license (MIT)

Items used in this project

Hardware components

Momentary Pushbutton Switch - 12mm Square Momentary Pushbutton Switch - 12mm Square x 1
Ultrasonic Sensor Hc-sr04 Ultrasonic Sensor Hc-sr04 x 1
Jumper Wire Kit - 140pcs Jumper Wire Kit - 140pcs x 1

Software apps and online services

Arduino IDE Arduino IDE
Cypress PSoC Creator Cypress PSoC Creator

Hand tools and fabrication machines

Soldering iron (generic) Soldering iron (generic) x 1



The CY8CKIT-049 is a 4$ prototyping kit with PSoC chip from Cypress Semiconductor based on ARM M0 MCU. It has following features :


The first part of the kit is an USB-UART module which serves as a programmer. The Second part has CY8C4248AXI-083 PSoC chip (ARM M0 MCU), which comes with UART Bootloader allowing it to be programmed over UART protocol.

Problem with Prototyping

The problems I faces while programming this kit in some of my old projects are :

  • Dodgy connection on USB Port during programming
  • Limited power for External Circuits
  • Heavy project hardware hanging from PC USB
  • Plug and unplug again and again to reprogram

I was annoyed and stopped using these kits for a while.

Solution to the Problem

The Solution is very simple:

  • Add a reset button for power cycle before bootlodable programming
  • Replace the USB-UART module with HC-05 Bluetooth Module

Step 1: Snap your CY8CKIT-049 and add a Reset Button

Snap the kit and solder necessary male/female pin header -

Snapped, header soldered and Reset Button added

Solder the reset button

Push switch between Reset and Gnd pin

Step 2: Use the USB-UART to Change HC-05's Baud to 115200

  • Connect the HC-05 to USB-UART module of the kit according to following diagram:-

Changing Baud of HC-05

  • Connect to PC with a UART module in AT command mode while holdiing the 'key' button on HC-05 module
  • A new port should appear as follows

Open Arduino IDE >> tools >> Port and select the new USB serial port. Next Open serial monitor and select 38400 ( which is AT command mode baud )

Now apply following AT commands in the Arduino serial monitor one line at a time and press send

AT+UART = 115200,0,0

This will change the baud rate of HC-05 to 115200, which is required for programming the main part of the PSoC kit .

Step 3: Pair HC-05 to PC and Find the Port

Go to Windows Bluetooth option and pair HC-05, new virtual com port will be installed after successful pairing.

Adding HC-05 to Windows PC

We will use the green one

Step 4: Connect HC-05 to PSoC

Now connect the HC-05 to the main part of the CY8CKIT-049 which has the mcu. See Schematic below for details.

Connection between PSoC4 and HC-05

Step 5: Program over Bluetooth with PSoC Creator

  • Open "PSoC Creator (4.2)" and compile the example "Bootloadable Blink LED" program.
  • Press & hold the Bootloadable button, press the reset button, release both button to enter programming mode.
  • Then go to Tools >> Bootloadable Host >> Select the Bluetooth Serial Port with Baud 115200.
  • Next click the upload to program wirelessly.

Uploading over Bluetooth

Additional Resources

USB-Serial Driver

PSoC Creator

Schematics, diagrams and documents



Bootloadable Blinking LED from Example


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