sending via uart from an arduino to display back in lcd display on another Arduino.
There are two Arduino boards. One is sending sensor status to another Arduino board via serial port and receiving side will display the sent message on LCD attached to it.
Can someone have any idea.
I moved your topic to an appropriate forum category @rpi4bplus1.
In the future, please take some time to pick the forum category that best suits the subject of your topic. There is an "About the _____ category" topic at the top of each category that explains its purpose.
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Thanks in advance for your cooperation.
➜ assuming you want to see if GND to GND between the arduinos is missing ?
Sorry about that. I was rush to post the topic.
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Yes. probably not soft serial. hardware serial link will be possible.
what's the distance between the 2 arduinos ? (and why can't you use only one ?)
is there any intelligence needed on the receiving arduino besides driving the display?
I almost forgot to tie GNDs together. Thanks for point me out this.
nearly 30 meter long link and don't want to use wireless link. Sensing part is on the roof of 5 story high and monitor from ground level. I will have to use 3 wire.
30m is probably too far for UART. You could envision using RS485 for example
What about Radio instead of messing with wires?
Yes, lest the information be picked up by bad actors with RF chops.
a7
any "good" reason?
Be careful with using the ground on one end with a ground on the other end. The voltage difference from roof top to ground level many be several volts or MUCH more during an electrical storm!
If it were me I would use CAN and run a inexpensive 4 conductor wire to power it and carry the communications. You can do CAN for less then the cost of a cup of coffee. Advantage if you want to add another sensor you just run the wires to it and connect it to the bus. Be sure to observe termination.
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