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ds18b20_reset();
ds18b20_write_byte(0xcc);
ds18b20_write_byte(0x4e);
ds18b20_write_byte(0x00);
ds18b20_write_byte(0x00);
ds18b20_write_byte(0x1f | (r << 5));
ds18b20_reset();
ds18b20_write_byte(0xcc);
ds18b20_write_byte(0x48);