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RS485 FOTW! (Firmware over the wire)

mick last edited by

Re: OTA Programming over wire ? (RS-485)

I can confirm this can be done. I had all sorts of trouble with compiling bootloaders and ended up using the precompiled sensebender micro bootloader (which uses pin 8 for CS (SS) activation of SPI memory). The way around this for now was moving the rs485 to the hardware serial port and disabling all debug output. I went with a 3.3 Arduino Pro Mini and level shifter for the MAX485 module (thats all i have here). I've done 3 firmware updates over the wire using MYSController and so far am impressed with the results. I would like to compile a new DualOptiboot and move the SS pin but can't seem to make this happen.

Very messy breadboard, but just for an idea.
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Hi @mariuszjozala , Thank you for reporting back. Glad that it works now! In my eyes, the good documentation (and availability of LTS options) is one of the really big plus points of the NanoPi/FriendlyARM products. I did save a local copy of their wiki, just in case it ever disappeared, because these references are really helpful. Best regards pragtich
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Hi, Have you seen the following: rs485-rs232-serial-transport-class-for-mysensors-org Is that what you are looking for?
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This is great, thanks! One suggestion: add a switch mode regulator that can handle 12 or 24 volt DC input. This will allow small sensor devices to hang off a typical bus network having extra pairs for the central power supply.
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Thanks for your fast reply. That sounds easy. And you think that the communication between sensor nodes and Gateway are still possible via wired RS485? I tried to find an example on this site for sending Information from Gateway to sensor nodes. (via SendMessage ?) For example I like to Switch on/off an light that is connected to an relay board at my sensor node. Communcation Flow: OpenHab2 --> MQTT --> Gateway --> RS485 --> Sensor Node --> Relay Board Currently I have an working RS485 Connection between my Arduino Uno's with the use from SoftwareSerial library. During my testings I realized, that the message that I triy to send "Hello" will be sent to the other arduino char by char. Is that true? Because I tried to raise up an pin on HIGH with "if(msg == "Hello")..." But it doesn't worked. Will the sendMsg method from the MySensor library handle this out of the box? Regards, Simon
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@kimot in theory you might be right, but in practice... it just works. The propability of collisions is extremely low and this is, as far as I know, the only problem you can worry about. After all, it was not my idea to use MySensors with RS485: https://www.mysensors.org/build/rs485
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By the way I have done this with the icsc lib from majenko, if anyone is interested. The rs485 input is directly sent via udp and v v. Additionally I extended the icsc with an ack funtionality to keep track on lost messages on the bus. It runs currently with 57600 baud.

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