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)

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Chris the Carpenter's picture

Just like Yoda said, "there is or is not"

Your picaxe is a 5v system and will output whatever it is getting for a Vcc. This is of course, in its "5v mode" (the m2's can also be run at 3.3v). In either case, again, your digital outputs will send out whatever the Vcc is.

The key words you need to focus on here are "level shifting" and if your bluetooth modules have it. Most bluetooth units (the chip itself) are usually 3.3v devices, however some bluetooth breakout boards include level shifting circuitry and can thus, be operated at 5v. 

Double check the comments above on the same topic and check your datasheets. 

ok, i'm almost done, my bT module has 2 modes one 3.3V and a Second with 5V. Thanks for all your help you have been really helpfull

ok, i'm almost done, my bT module has 2 modes one 3.3V and a Second with 5V. Thanks for all your help you have been really helpfull

Chris the Carpenter's picture

Hey Nicolas,

I did an Android app specifically for robots that might work for you. Send me an email, and I will send you a copy for you to play with if you would like. It will talk to your picaxe just fine.

The app is here

rocketbrand@gmail.com

i'm completely sure that is a great build app, and i thank your gentlehood but as a school work i prefer to do it for myself.

Thanks!(could you tell me which is the average voltage that the 18m2 transmit to the modules?I'm doubting because the internet says different things)

omg why is everybody saying contradictory things?

I have already bought the ebay one, have i commited an error?

 

Thanks!

6677's picture
At the end of the day Bluetooth is Bluetooth. As long as it will hook up to the picaxe your good.

thanks i will work hard to make it work!

 

thanks all you guys who helped me!

jinx's picture

the picaxe 18m2 will run at 3.3V so no need for level shift. DOES it have to be bluetooth as they have brought this radio module out that will allow you to program the picaxe over the air http://www.techsupplies.co.uk/epages/Store.sf/en_GB/?ObjectPath=/Shops/Store.TechSupplies/Products/RFA030. it's a pricey start but once you got the base station up and running you could add erf module for £15 to any project.

at the end do i have to use a V switcher or not?( bought  http://www.ebay.de/itm/UART-TTL-Bluetooth-Module-slave-master-and-3-3V-5V-/130545269839#ht_1204wt_828 arrived today)