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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal>Hi Rob,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>That’s great, you’ve got very far in a very short amount of time! <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>It sounds like you’re “holding” the wires on – just solder them on if you have a soldering iron around, it’s easy enough to take them back off after the operation.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I can imagine that there’s a ground potential problem and perhaps one of the devices doesn’t like the 3.0V supply. The Radbot takes very little power and I was able to simply power it from my USB-serial adapter, but that depends on the adapter of course. Alternatively, the RPi also has a 3.3V supply (and 5.0V too) and it has a serial port right next to the supply pins too, so if you have a few breadboard wires around, that would be a simple and quick alternative.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Cheers,<o:p></o:p></p><p class=MsoNormal>Christoph<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b>From:</b> OpenTRV-dev <opentrv-dev-bounces@lists.opentrv.org.uk> <b>On Behalf Of </b>Robert May<br><b>Sent:</b> Sunday, 14 February, 2021 18:24<br><b>To:</b> Closed list for developer discussions <opentrv-dev@lists.opentrv.org.uk><br><b>Subject:</b> [OpenTRV-dev] Help getting serial connection to Radbot<o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>I've finally found time to unbox my Radbots. The plan is to build a combined stats hub and boiler controller based on a RPi.<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I've successfully compiled the code Christoph shared (<a href="https://github.com/wintersteiger/wlmcd">https://github.com/wintersteiger/wlmcd</a>) and used to to show the one Radbot I've powered up transmits and that I can receive the frames using a CC1101/RPi combination. Of course the decryption fails as I've yet to set a decryption key.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I'm struggling to get a connection over the serial port to the Radbot. I'm trying to follow the instructions shared by Tristan (<a href="https://github.com/tyrken/heatmon/wiki/Reprogramming-Radbot-TRVs">https://github.com/tyrken/heatmon/wiki/Reprogramming-Radbot-TRVs</a>) but I can't seem to get any comms over the serial port.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I've opened up my radbot to get better access to the pads.<o:p></o:p></p></div><div><p class=MsoNormal>I'm powering the Radbot from a bench power supply at 3.0V<o:p></o:p></p></div><div><p class=MsoNormal>I've got a USB serial dongle operating at 3.3V logic, grounded to the -ve supply.<o:p></o:p></p><div><p class=MsoNormal>I think I'm hold the rx/tx lines on the pads (tx from my dongle to rx on the radbot and rx on the dongle to tx on the Radbot), but I get nothing from 'screen' that I'm using for my terminal.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>As far as I know I'm using 4800baud, 8-N-1 (screen /dev/ttyUSB0 4800), which I believ to be the expected settings?<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Can anyone see anything that I'm doing wrong or give me a pointer to things that I can try. ?<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Thanks,<o:p></o:p></p></div><div><p class=MsoNormal>Rob.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div></div></div></div></body></html>