Hello, so I bought this board form amazon https://a.co/d/6k842hv I have strain gauge connected directly to the board, i notice that board has RXD and TXD pins. is the arduino able to read values from those ports?
Probably so but do you have a data sheet for this device?
I havent found its very much chinese components
Try contacting the amazon seller and request some info.
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It looks like a I2C device but beyond that good luck. There is a place where you can: Report an issue with this product or seller take advantage of it and ask for either adequate instructions or your money back with shipping on them. Currently it will be of no more use to you if they have it. Reading the comments you are not the only unhappy one.
If the board doesn't have the headers fitted for that interface, then you are taking a chance that the board as configured will present/accept information on those pins.
A quick search suggests that the 15W408AS from ST Micro is an 8051 based device. It may or may not be programmed to support serial I/o.
What I see on the device(remember, mostly 'informed' guesses)
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The unit is capable of using it's own 711, or an external I2C 711 via the 4-pin side connector that is not populated. From this, I would conclude the I2C bus is not for communication with a master, but rather for communication as a master, and therefore useless to you.
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The unit transmits it's readings via serial. At a minimum, you should be able to receive those readings; trouble is, there's no info about baud rate, bit count, or parity, so you'll have to try different things until you get it to work. A generic serial terminal might be much easier than multiple reprogrammings of your Arduino when sorting this out
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One of the reviewers provided a pretty good user manual, if you read through the reviews, so you should be able to get it working. Sad commentary, though, on the quality of the seller (not the designer), that users have to resolve this for them.
Take this as a lesson. The quality of products on Amazon is all over the map, as is the quality of sellers. You don't yet know the quality of the product, but you've clear evidence about the seller of this product. You can mess for this for days and not get anywhere, or you might get lucky with an hour's focused effort, but you won't know until you're done, or you give up. Not the way I like to spend my time.
This module uses a 15W408AS processor
therefore it must have a serial communication feature.
15W408AS datasheet:
Serial (VCC, RXD, TXD, GND) and I2C (VCC, SCK, DT, GND) pin headers are unpopulated. Leaves me thinking the module may be offered in multiple variants, with the header only populated if that feature is supported. Normally, documentation would tell you what it has and hasn't. But this is Amazon, home of cheap junk, so YMMV. It might actually do it all, but then it might...not.
In the website photos, I don't see traces on either side of the PCB going to RxD or TxD. You can check the actual board, but that doesn't seem like a good sign.
But, could be a four layer board. Unusual for 'cheapies', but not impossible.
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