I want code sent data on float read by UNO sent to mega2560
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Which distance between the boards?
Do you want to send the float value as text or in binary format?
If it's text, you can study Serial Input Basics - updated for ideas about serial communication. On the Mega, you can use the examples; modify for e.g. Serial1 instead of Serial) so Serial stays available for debug output to the PC. On the Uno you can use SoftwareSerial to connect to the Mega's Serial1 in that case.
Which communication line of the following you want to use?
1. Software UART Port
2. I2C Bus
3. SPI Port
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