Is this schematic right for a HC-05 to PIC?

Thread Starter

Gareth Morgan

Joined Oct 26, 2014
7
Hi,
I'm new to all this and I've designed a schematic for a POV clock. I thought I had the schematic correct when connecting the HC-05 bluetooth module to the PIC16f877a, but a quick search on google images shows different versions.

Need some clarification from more experienced users!
 

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Thread Starter

Gareth Morgan

Joined Oct 26, 2014
7
Its voltage divider network, as the HC-05 can't have more than 3.3V going into it. The resister values are accuate though yet as I'm not 100% sure of the power going into the PCB yet.
 

MrChips

Joined Oct 2, 2009
30,712
41Ω load seems somewhat extreme. I would try something like R21 = 100Ω, R22 = 200Ω if you want to reduce 5V to 3.3V
 

tshuck

Joined Oct 18, 2012
3,534
UART is typically Rx to Tx and Tx to Rx (the way you have it), but the signals are sometimes switched when getting stuff from China.

I'd recommend testing the module first, or adding a series resistor to each of the lines in case of a signal swap.
 
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