so far i think i have half the parts layed out. i have the nano, mma8452q, ADS1115, 5V DC power at 1A and 3.3V DC power circuit. the parts come to 12.30 USD the boards are another 5-10 USD. i tried to see how much it would cost to get assembled. but some parts show unavailable even though they are available in the catalog. ill have to figure out why this is and change my selection. but i’m hoping the cost will be 50-100 USD per assembled board. i’m not sure if that is reasonable yet. i would also like to be 1/2 the size of the current openag PCB. My current PCB is 1.75" x 2.75"(1/4 the size of openag).
what do you think about having 2 board stuck together like an ardruino hat? the bottom board could be power distribution and inputs and the top board could be communication, nano and sensors? i don’t have an enclosure in mind yet. but this might be a way to cut down on the physical size of the enclosure.
i was wondering about using USR-TCP232-T2. i think you basically connect it to the UART TX and RX pins. Then you setup the interface with the web page.
The other thing to mention is that Ethernet is A LOT faster. serial communication is so slow. a baud rate of 9600 is 9600 bits per second. Ethernet is 100mbit or even gigabit per second. noise is another thing. Ethernet just works(up to 300 feet). some serial connections over longer distances are trouble some. maybe 50 feet.