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Topic: RN-41 bluetooth with an arduino (Read 2 times) previous topic - next topic

frank26080115

I actually don't know what the RX and TX supply current actually means, sorry.

The regulator that comes with USnooBie (see my signature below) is the TC1262 and can supply 500 mA worth of 3.3V
Freelance engineer, consultant, contractor. Graduated from UW in 2013.

SouthernAtHeart

Anyone else know if you can use the Uno's 3.3 v to power the Rn-41; the specs (see my previous post) kinda say 2 different things...

SouthernAtHeart


SJ is solder jumper

You don't need RTS or CTS

The 3.3V pin on the Uno can be used instead of a dedicated power supply circuit (I think... Only if RN-41 use less than 50 mA), but any version before Uno has a baaaad 3.3V supply from the FTDI chip and I would never use it.

You know what, I'm at work right now, but I have a way simpler way of doing level conversion than SparkFun. Level conversion can be done with a diode and a resistor, instead of the whole mosfet thing they have.

Code: [Select]


                            ^ 3.3V
                            |
                            |
                            >
                            > 10K resistor
                            >
                  diode     |
(Arduino's TX) -----|<|-----+---------- (RN-41's RX)

(Arduino's RX) ------------------------ (RN-41's TX)



use a high speed diode


Can I do a similar thing to use the 5V FTDI cable from sparkfun to upload sketch to a 3.3Volt pro mini?
Here's a schematic I drew up:

frank26080115


Can I do a similar thing to use the 5V FTDI cable from sparkfun to upload sketch to a 3.3Volt pro mini?


from http://www.sparkfun.com/products/9716

Quote
This board ship default to 5V, but you can cut the default trace and add a solder jumper if you need to switch to 3.3V.
Freelance engineer, consultant, contractor. Graduated from UW in 2013.

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