How To - MS Onboard Bluetooth Cheap Ebay module (HC-05)

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Re: How To - MS Onboard Bluetooth Cheap Ebay module (HC-05)

Postby grom_e30 » Thu Dec 14, 2017 12:11 pm

you connect it inside before the signals go through the msx232 circuit, the 5v ttl signals from the processor are stepped up to rs232 signals +12/-12v by the max232. the rs232 signal would prob kill the 5v ttl bt module if you connected it directly to the serial port without using another max232 to step the signal back down.
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Re: How To - MS Onboard Bluetooth Cheap Ebay module (HC-05)

Postby racingmini_mtl » Thu Dec 14, 2017 12:59 pm

But you can get cheap modules on ebay that already have the max232 and the DB9 connector.
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Re: How To - MS Onboard Bluetooth Cheap Ebay module (HC-05)

Postby MegaMicra » Thu Dec 14, 2017 1:11 pm

Thanks for the info guys. So going off what you both have said, it might work if I connect one of those ready made max232 modules to my hc-05 Bluetooth module. It's only a couple of quid to try it. If not I'll just buy one of the proper Bluetooth ones.

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Re: How To - MS Onboard Bluetooth Cheap Ebay module (HC-05)

Postby racingmini_mtl » Thu Dec 14, 2017 2:15 pm

What I meant is that there are Bluetooth modules with everything integrated: max232, DB9 and HC-05 (or equivalent). That's much easier to deal with than separate RS232 module and Bluetooth module.

Jean

EDIT: Like this: https://www.ebay.ca/itm/DB9-RS232-RF-Wi ... 2108777586
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Re: How To - MS Onboard Bluetooth Cheap Ebay module (HC-05)

Postby MegaMicra » Sat Dec 16, 2017 8:14 pm

Ah right I see. I could just reprogram the baud rate etc to work with my MS3X and then use the HC-05 that I've already got for the raspberry pi. Thanks for the info and link.

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