Let's Make Robots!

Bluetooth picaxe module

Hi, I have a picaxe 18m2 and a chi035a board and i would like to know if i have any possibility to pass information via bluetooth from a mobile to the picaxe, i'm just interested in the hardware, i'm not asking for software.

I have seen sparkfun.com site and I cant decide which module choose. Would  https://www.sparkfun.com/products/8497  that module work on my idea, otherwise could you say me which one would i need?

I really thank any help and I hope you have a solution to my project.

Gratefull, Nicolas.(excuse my english)

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.

He specified from a mobile phone which would limit him to NFC, cellular or bluetooth for communications. NFC wouldn't be suitable, cellular would be expensive.


Between a PC and picaxe that looks like a nice set-up though.

The RN41 is a very good Bluetooth module but not the best choice for your needs.

  • The Bluetooth module needs 3.3V power supply and 3.3v signal level. The PICAXE is a 5V device. You will need level shifters 5v->3.3V for signals and a 3.3V power source. 
  • The RN41 module is a SMD module with a smaller pinout than standard 0.1'' spacing. Difficult to connect wires to it.

Better buy a Bluetooth module including level shifter and power source like the BlueSMiRF silver. Or get a cheaper one from chinese eBay sellers, like this one.

thanks i'm buying ebay one, I still dont know how does the master-slave system works but I rely on you, I will investigate!



A few things about the cheap BT modules from eBay you should know:

  • The BT Modules can't be configured from the Bluettoth side, only from the serial UART side. This could be making trouble if the module is wrong configured. From the spec sheet it should work as slave, 38.4kBaud. This should work for you. If you need to change the setup, you will need a USB/UART module to connect the BT module on a PC and change the setup from a terminal program.
  • Be warned. Some eBay sellers sell similar modules with wrong or without any specs. See this thread

BTW. The BlueSMiRF can be configured from the Bluetooth side. 



6677: Thanks! :)


Could anybody else confirm that?

That model should work fine