Nice to hear someone else using Modbus/RS485. Thanks for sharing the library.
The realtime serial processing is a challange and I have got it working on different systems. The first sign to look for is whether its supported in chips UART through DTR.
One issue with the automatic flow control is that it uses a couple of mA to maintain the…[Read more]
I’m sorry I’ve missed this thread until now.
I agree that when interfacing with a 12V powered device through the RS485 adapter, there shouldn’t be much risk of frying the Mayfly. I would still go with a separate power boost instead of stripping the resistors on the Mayfly, though.
I would *NOT* recommend any RS485-to-TTL adapters based on the…[Read more]
We just received a big shipment of new Mayfly boards from the manufacturer yesterday, I tested a bunch today and boxed them up, so they’ll be on their way to Amazon tomorrow. You should see the boards available on Amazon next week sometime, with the kits available the week after that. We had a lot of orders right before the holidays that drained…[Read more]
Thanks for the link – I think I hadn’t figure out the right registers addresses to read, so very useful.
I’m assuming your include <ModbusMaster.h> pulls https://github.com/4-20ma/ModbusMaster
The direction I’m heading in is with the BeagleBone Green Wireless and generating Modbus 12V off 5V. Will post more when I have it tested.
I had successfully read LT400 through Modbus potocol. The TTL to RS485 coverter I was use showed in the attached photo.
I am using an external 12V battery for the testing setup.
I burnt out one of the logic pin somehow, I could not find out the reason. maybe the 12V meet the logic pin accidentally.
I sent a private message to you…[Read more]
ChanCafun replied to the topic Looking for a bare-bones 16 bit 0-5V dc data logger sketch to build off of in the forum Mayfly Data Logger 2 weeks, 6 days ago
The schematic ADC’s name printed as ADS1105 but not ADS1115.
Nice to see the pic of the 3G logger.
I was wondering if you got the link to the LT400 working.
I’ve been attempting to access the LT500 but not had any success decoding the LT500 protocol that runs on top of the modbus/RS485.
I have had packets as per the “Insitu Modbus_Communication_Protocol_5.10.pdf” but seems there is some…[Read more]
Thanks for the reply. I had tried to delete this post after I solved my problem. I had a small error on the web address that loaded a lot of libraries but not the Mayfly that I needed. All is well now. Thanks.
After a Mayfly workshop earlier this week, I helped 2 people install the IDE and Mayfly drivers on their Macs, using the latest Arduino IDE and by following the directions on this site, and it went smoothly with no issues. Are you just not seeing the EnviroDIY boards listed when you choose “Contributed”? If you’ve pasted the URL properly into…[Read more]
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