LilyGO-T-RELAY 4 channel ESP32 #16054
Replies: 4 comments 28 replies
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There is only one relevant serial port for flashing. TX/RX on gpio 1/3. Yes, that's not broken out in headers, but that's what you get for not buying the standard USB/serial adapter sold by Lilygo. And you need the usual power+gnd, and grounding gpio 0 to get in flashing mode. |
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Yes, I see all the GPIO's but my point is they aren't all tied to the header and even that are labelled IO so not 100% sure those mean GPIO. I assume they do. Yes, it's not friendly to flash for sure and the frustrating thing is that I'm doing this just to get some hands on experience doing it as I've ordered one or two devices that already have tasmota installed :). I just wanted to play with this over the weekend when I have a few minutes here, there. I can't find anything that gives any info on which lead might be GPIO00 so I guess this is as far as I can get. |
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I guess I could try soldering a lead to GPIO00. Can I use the GND from the usb-c connector then? |
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Yes. You could also hand-hold a connection while powering up.
If you look at the ESP32-WROOM module pinout, that's where you see all the gpios, and not all of them are tied to the header, by far not. To find info on what's connected, use your multimeter to check where it beeps. |
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Safe working way is to solder directly the needed wires to the wrover module tx rx gpio0 3.3V gnd to the USB serial device (preferred the "golden" ch340). Powering the wrover module from there. |
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Yes, I thought about that after I walked away from my reply. I'll give that a try shortly :). I'm brand new to trying tasmota and part of the learning is what hardware to buy for sure. They do make it weird for someone using their board don't they. There are some posts on their Amazon page of others who seem to have flashed it but they likely used the adapter which I thought was included when I ordered. No big deal, I'll try touching the lead and see what happens. |
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Well, the board smoked when I applied power via the usb-c so I'm done for now. I did buy another board at the same time because I see reviews saying some flashed it. The chip is PSF-B so I'll look at the page that was shared. Was so hoping to get to try tasmota over this weekend. Update: And of course, none of the leads for headers are marked to show which connect to rx/tx. |
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No idea what you are talking about. I assume it's something to do with encouraging a 70 year old man to learn because this seems like an interesting project that members would love to see being used by many. And not to scare those new people off by being rude or mean to them. I'm assuming all that :). The link you show I had shared already mentioning that none of the header labels match the chip. I even used a magnifying glass to try and see if I could see the leads but it seems to be a layered board. |
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Oh sorry, the comment was not ment in your direction. Everything goes in direction of LilyGo!! |
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That was, was i ment with the |
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70 years young! I hope my brain will work so well as yours when doing new stuff. |
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I appreciate that it wasn't against my lack of knowledge. I was excited so bought what I could at the moment and will find better devices. Life is all about learning and I'm assuming I will blow up more boards but that's ok. The end result of being able to use an interesting project like this will make it worth the time and cost of making mistakes :). |
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If that helps anyone else, I went through the Happy to report that it was easier than I feared (although I do have the adapter to make the process simple)! I documented the steps I followed in https://github.com/yoannchaudet/LilyGo-T-Relay-Tasmota. |
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Well, using the adapter it was indeed expected to be just as easy as flashing other devices with more friendly designs. It was just a crap move to design and sell a device outright hostile to flashing without having to buy an overpriced adapter on the side, when it would be no real cost to break out the pins in an accessible way, as done with nearly all other boards. I've even got a Lilygo device meant to be flashed with a special adapter, but still having the relevant pins broken out for easy access. |
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Thanks @yoannchaudet for documenting |
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I submitted the 8-relay template for review yesterday ❤️ |
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just read here about the boards ... I found a link to more information including a schematic at AliExpress : |
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Very nicely documented, let's now connect a shunt from Juncktek to RS485 and send the data further on CAN. |
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Hi guys, I ordered the corresponding 8-channel relay last week and received it yesterday. Apparently you don't need the T-U2T adapter anymore since RX and TX are now pins on the board (picture). |
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Looks nice! |
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For anyone who's playing with this board, it was nearly impossible to find information on this so I thought I should share.
I accidentally ordered the above board without the U2T kit adapter to flash it. I'm wanting to get something done over the weekend and am not sure I'll be using this board permanently as I learn about tasmota so I decide to try using serial.
From what I've read, this board has three serial ports.
A quick look here seems to only show two sets of R/X pins.
https://tasmota.github.io/docs/Pinouts/#esp32-wrover
This seems to show pins 17 (rx) and 18 (tx) are what I'll need or alternatively, 34/35.
The image in the link shows gpio1 tx, gpio3 rx and gpio9 rx, gpio10 tx.
However, the board doesn't have any of those, it only shows IOxx pins and none are the above.
It could be pins IO34 and IO35 so I tried that but I get nothing.
I cannot find any information on what pins I need to connect to get serial access.
I have the esp32 module on this. ESP32-WROVER-B but as mentioned, that link being shared, I don't have those pins in the header.
The header labels are all IOxx and none of the numbers are pins I've found anywhere in this link or on the net.
The top pins on the right show 34 and 35 and I have IO34 and IO35 on the header label but those didn't work.
I took a nice and thick C-cable and carefully cut it open to reveal only four wires.
Two power, two data I guess since two of the wires are obviously thicker than the others so must be power.
It's not a full cable but I hoped it meant it would simply have power and data connectors but so far, I cannot get much from a serial connection, just a lot of garbage at all baud rates and flow control settings. Definitely what seems to be a stream of data as it corresponds with the initial booting and testing of each relay then a pulse.
Update, ah, finally got it.
115200, 8N1, XON/XOFF.
Must have rx, tx AND GND connected. Without ground, it goes crazy with data on the terminal screen.
`
..ets Jun 8 2016 00:22:57
rst:0x1 (POWERON_RESET),boot:0x12 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0018,len:4
load:0x3fff001c,len:1044
load:0x40078000,len:10124
load:0x40080400,len:5856
entry 0x400806a8
setup
scan start
scan done
6 networks found
1: mylan (-62)*
2: neighbor1 (-89)*
3: neighbor2 (-89)*
4: neighbor3 (-89)*
5: neighbor4 (-89)*
6: neighbor5 (-90)
Connecting to xinyuandianzi
.....................
`
Interesting that it sees the local wilreless networks.
Says it's connecting to 'xinyuandianzi'. No idea what that is, there's no wifi around here with that name.
Anyhow, now I need to find information that explains how to load tasmota onto this and I finally get to see it in action then I'll play with a broker I've installed on a local ubuntu server.
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