Couple of weeks ago i bought a cheap bluetooth module from e-bay.http://www.ebay.com/itm/TTL-Bluetooth-Module-Arduino-uControllers-/330632884570?_trksid=p4340.m185&_trkparms=algo%3DSIC.NPJS%26its%3DI%26itu%3DUA%26otn%3D5%26pmod%3D230689344642%26ps%3D63%26clkid%3D3891958372673248975
When i received it, everything worked well.
Today i soldered some pins to the module and plugged it in to my breadboard.
Then I uploaded sample code to Arduino. After double checking everything, i powered it on. But nothing.
The only thing that works, is that my phone makes successful connection to bluetooth module. I can tell this, because bluetooth module stops blinking (searching, announcing) and my cellphone says it is connected.
I uploaded sample script that should take my compass readings and send them to Arduino as an integer "time led blinks". I also tried another script that worked well before, but no luck.Is it possible, that although bluetooth module creates successful connection to my smartphone, it is not able to send commands to Arduino? Someone wrote in another post that bluetooth module's RX, TX work with 3.3V, but Arduino's RX, TX pins work with 5V, so definitely should use resistors.
- Unfortunately I forgot this crucial aspect and connected modules RX / TX straight to Arduino pins