strange error whith my arduino uno

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hi everybody,
i´m new in forum , i´m argentina , need whit this...
i bought arduino uno on junuary , play every day, last proyect made temperature sensor using dalas 18b20 , lcd16x2 months ago , works perfect , works everyday...
yesterday boring , try conect ultrasonic sensor(ping) so, conect arduino de pc, , recognise it, com49 , read serial monitor , read temperature too, upload de new program , de arduino ide tell me upload ok, looks great, program not uploaded, try again nothing, tx , rx led´s turn on while uploading arduino never charge de new program, , never delete older, conect lcd , temp sensor , works... can´t understand problem, , pc never detect error...

what problem?

thank , wait answer...

1) first try blink program. check whether blink program works or not

2) changed os , ide after old program being uploaded???

3) try clear build folder while uploading.

let me know if error come again. & try share ur new code & old code.


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