<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=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi,<div class=""><br class=""></div><div class="">Officially I think the abs max rating for some of the Radbot components is ~3.6V, though I’d have to check.</div><div class=""><br class=""></div><div class="">I really don’t suggest running it at 5V for any significant time.</div><div class=""><br class=""></div><div class="">Rgds</div><div class=""><br class=""></div><div class="">Damon<br class=""><div class=""><br class=""><blockquote type="cite" class=""><div class="">On 14 Feb 2021, at 23:25, 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="">Regardless of what else changed I can't make it work with my (cheap) CH430 USB dongle (similar to this one: <a href="https://www.ebay.co.uk/itm/3-3V-5V-Serial-Adapter-Module-CH340G-USB-to-TTL-6-Pin-UART-Adapter/192935577926?hash=item2cebdb4946:g:RFsAAOSwyXNZ-mJr" class="">https://www.ebay.co.uk/itm/3-3V-5V-Serial-Adapter-Module-CH340G-USB-to-TTL-6-Pin-UART-Adapter/192935577926?hash=item2cebdb4946:g:RFsAAOSwyXNZ-mJr</a>). It works fine with the PI's built in serial port, so no actual dongle needed at all.<div class=""><br class=""></div><div class="">To use the built in serial port you need to stop the PI using it for boot messages and attaching a terminal to it:</div><div class="">sudo raspi-config; Select option 3 Interface Options, and then Option P6 Serial port; Answer 'no' to the question "would you like a login shell to be accessible over serial?", and 'yes' to "Would you like the serial port hardware to be enabled", and then reboot.</div><div class=""><br class=""></div><div class="">Then connect Physical pin 8 (TxD) to TX pad on Radbot and physical pin 10 (RxD) to RX pad on radbot. COnnect one of the ground pins (e.g. physical pin 6) to the -ve terminal of the radbot. and start a terminal on /dev/ttyAMA0</div><div class=""><br class=""></div><div class="">Either screen (if you have it installed): screen /dev/ttyAMA0 4800. (Ctl-A k to kill the session and exit)</div><div class="">or microcom (installed in base image): busybox microcom -s 4800 /dev/ttyAMA0 (Ctrl-X to exit)</div><div class=""><div class=""><br class=""></div><div class="">If it's safe to power the Radbot from 5V then it could be powered from the PI, but not from the 3.3V rail if the motor unit's attached (usually OK to get at least 300mA from the 5V rail, but only 50mA allowed from the 3.3v rail - source: <a href="https://www.circuits.dk/everything-about-raspberry-gpio/#:~:text=The%20total%20maximum%20recommended%20current,the%20rest%20of%20the%20board" class="">https://www.circuits.dk/everything-about-raspberry-gpio/#:~:text=The%20total%20maximum%20recommended%20current,the%20rest%20of%20the%20board</a>. ). If my memory serves me I was seeing about 160mA draw when the motor was running.</div></div><div class=""><br class=""></div><div class="">Rob.</div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, 14 Feb 2021 at 23:01, Tristan Keen <<a href="mailto:tristan.keen@gmail.com" target="_blank" class="">tristan.keen@gmail.com</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 dir="ltr" class="">Glad to hear you got there!<div class=""><br class=""></div><div class=""> My USB/Serial cable (link in Part List wiki page) was outputting 4.9 V open circuit from the "power" connections, so I presume it was connected to the USB main power output. Originally I tried powering the Radbot via a couple of low value (82 Ohm) resistors as I was a bit nervous of driving it at the higher than expected voltage, but couldn't connect reliably. After checking the Atmel 328P's datasheet, which suggests a 2.7 - 6V range, I removed the resistors and tried again - it worked. Voltage dropped to 4.4 volts or so when the motor came on during its initial valve cycling though.</div><div class=""><div class=""><br class=""></div><div class="">So far all four appear to be unharmed...</div></div><div class=""><br class=""></div><div class="">Tristan.</div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, 14 Feb 2021 at 22:26, Robert May <<a href="mailto:rob@themayfamily.me.uk" target="_blank" class="">rob@themayfamily.me.uk</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 dir="ltr" class=""><div dir="ltr" class="">Thanks all. I'm there (or at least I think I am).<div class=""><br class=""><div class="">I changed a number of things - the voltage I'm driving the Radbot (now at 3.3v), I remade my solder connections and replaced the wires/connectors as I think one of the dupont connectors was loose, and I moved to using the built in serial port of the PI (/dev/AMA0). I'll see if I can work out which of these was actually the culprit.</div></div><div class=""><br class=""></div><div class="">Out of interest, what is the max voltage that is safe to run the Radbot. If I understand this page correctly (<a href="https://github.com/tyrken/heatmon/wiki/Reprogramming-Radbot-TRVs" target="_blank" class="">https://github.com/tyrken/heatmon/wiki/Reprogramming-Radbot-TRVs</a>) then it is suggesting powering it at 5V (direct from the USB port)</div><div class=""><br class=""></div><div class="">Onwards.</div><div class="">Rob.</div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, 14 Feb 2021 at 21:45, Damon Hart-Davis <<a href="mailto:dhd@exnet.com" target="_blank" class="">dhd@exnet.com</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 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 class=""><br class=""><blockquote type="cite" class=""><div class="">On 14 Feb 2021, at 20:52, Robert May <<a href="mailto:rob@themayfamily.me.uk" target="_blank" class="">rob@themayfamily.me.uk</a>> wrote:</div><br class=""><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" target="_blank" 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" target="_blank" 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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