<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi,<div class=""><br class=""></div><div class="">1) FWIW, when I am powering remotely, eg to reflash, I tend to run at 3.6V.</div><div class=""><br class=""></div><div class="">2) Yes, I think that we label our TX and RX the ‘wrong’ way round and have confused ourselves from time to time. Almost certainly an early error or at least bad choice by me, reinforced by my trying to then be consistent across schematics.</div><div class=""><br class=""></div><div class="">3) FWIW I use a FTDI TTL-232R-3V3 to talk to Radbots.</div><div class=""><br class=""></div><div class="">Rgds</div><div class=""><br class=""></div><div class="">Damon<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 14 Feb 2021, at 20:52, Robert May <<a href="mailto:rob@themayfamily.me.uk" class="">rob@themayfamily.me.uk</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">Thanks Damon, Christoph.<div class=""><br class=""></div><div class="">I already moved to soldering my connections to eliminate that issue.</div><div class=""><br class=""></div><div class="">I can see the TX LED flash on my dongle when I hit <return>, and if I swap the tx/rx connections so I have tx on dongle to tx on Radbot and rx on dongle to rx on Radbot then after I hit <return> I see the rx led on the dongle flash approx. every 2 seconds for a while - so I *think* I'm waking it up. This feels wrong, but past experience tells me that there is sometimes confusion over how rx and tx pins are marked.</div><div class=""><br class=""></div><div class="">But I see nothing in my terminal. I've shortened the wires as much as I can, and I'm sure that my grounds are OK</div><div class=""><br class=""></div><div class="">Can you expand on what you mean by "perhaps one of the devices doesn’t like the 3.0V supply"?</div><div class=""><br class=""></div><div class="">Here's a couple of pictures</div><div class=""><a href="https://www.dropbox.com/s/s8jdv6j9a4covw3/Photo%2014-02-2021%2C%2020%2041%2054.jpg?dl=0" class="">https://www.dropbox.com/s/s8jdv6j9a4covw3/Photo%2014-02-2021%2C%2020%2041%2054.jpg?dl=0</a><br class=""></div><div class=""><a href="https://www.dropbox.com/s/sp819pw2ds1lf73/Photo%2014-02-2021%2C%2020%2042%2011.jpg?dl=0" class="">https://www.dropbox.com/s/sp819pw2ds1lf73/Photo%2014-02-2021%2C%2020%2042%2011.jpg?dl=0</a> (not a good shot, but I'm sure the pins and +ve terminals are not touching)<br class=""></div><div class=""><br class=""></div><div class="">Any other ideas? I've been staring at this all day and can't see what's wrong.</div><div class=""><br class=""></div><div class="">Rob.</div><div class=""><br class=""></div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, 14 Feb 2021 at 19:33, Christoph M. Wintersteiger <<a href="mailto:christoph@winterstiger.at" target="_blank" class="">christoph@winterstiger.at</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang="EN-US" class=""><div class=""><p class="MsoNormal">Hi Rob,<u class=""></u><u class=""></u></p><p class="MsoNormal"><u class=""></u> <u class=""></u></p><p class="MsoNormal">That’s great, you’ve got very far in a very short amount of time! <u class=""></u><u class=""></u></p><p class="MsoNormal"><u class=""></u> <u class=""></u></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.<u class=""></u><u class=""></u></p><p class="MsoNormal"><u class=""></u> <u class=""></u></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.<u class=""></u><u class=""></u></p><p class="MsoNormal"><u class=""></u> <u class=""></u></p><p class="MsoNormal">Cheers,<u class=""></u><u class=""></u></p><p class="MsoNormal">Christoph<u class=""></u><u class=""></u></p><p class="MsoNormal"><u class=""></u> <u class=""></u></p><div style="border-right:none;border-bottom:none;border-left:none;border-top:1pt solid rgb(225,225,225);padding:3pt 0in 0in" class=""><p class="MsoNormal"><b class="">From:</b> OpenTRV-dev <<a href="mailto:opentrv-dev-bounces@lists.opentrv.org.uk" target="_blank" class="">opentrv-dev-bounces@lists.opentrv.org.uk</a>> <b class="">On Behalf Of </b>Robert May<br class=""><b class="">Sent:</b> Sunday, 14 February, 2021 18:24<br class=""><b class="">To:</b> Closed list for developer discussions <<a href="mailto:opentrv-dev@lists.opentrv.org.uk" target="_blank" class="">opentrv-dev@lists.opentrv.org.uk</a>><br class=""><b class="">Subject:</b> [OpenTRV-dev] Help getting serial connection to Radbot<u class=""></u><u class=""></u></p></div><p class="MsoNormal"><u class=""></u> <u class=""></u></p><div class=""><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.<u class=""></u><u class=""></u></p><div class=""><p class="MsoNormal"><u class=""></u> <u class=""></u></p></div><div class=""><p class="MsoNormal">I've successfully compiled the code Christoph shared (<a href="https://github.com/wintersteiger/wlmcd" target="_blank" class="">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.<u class=""></u><u class=""></u></p></div><div class=""><p class="MsoNormal"><u class=""></u> <u class=""></u></p></div><div class=""><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" target="_blank" class="">https://github.com/tyrken/heatmon/wiki/Reprogramming-Radbot-TRVs</a>) but I can't seem to get any comms over the serial port.<u class=""></u><u class=""></u></p></div><div class=""><p class="MsoNormal"><u class=""></u> <u class=""></u></p></div><div class=""><p class="MsoNormal">I've opened up my radbot to get better access to the pads.<u class=""></u><u class=""></u></p></div><div class=""><p class="MsoNormal">I'm powering the Radbot from a bench power supply at 3.0V<u class=""></u><u class=""></u></p></div><div class=""><p class="MsoNormal">I've got a USB serial dongle operating at 3.3V logic, grounded to the -ve supply.<u class=""></u><u class=""></u></p><div class=""><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.<u class=""></u><u class=""></u></p></div><div class=""><p class="MsoNormal"><u class=""></u> <u class=""></u></p></div><div class=""><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?<u class=""></u><u class=""></u></p></div><div class=""><p class="MsoNormal"><u class=""></u> <u class=""></u></p></div><div class=""><p class="MsoNormal">Can anyone see anything that I'm doing wrong or give me a pointer to things that I can try. ?<u class=""></u><u class=""></u></p></div><div class=""><p class="MsoNormal"><u class=""></u> <u class=""></u></p></div><div class=""><p class="MsoNormal">Thanks,<u class=""></u><u class=""></u></p></div><div class=""><p class="MsoNormal">Rob.<u class=""></u><u class=""></u></p></div><div class=""><p class="MsoNormal"><u class=""></u> <u class=""></u></p></div><div class=""><p class="MsoNormal"><u class=""></u> <u class=""></u></p></div></div></div></div></div>_______________________________________________<br class="">
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