From Hackaday: Single chip usb temperature sensor.
Have not tested this, so try at your own risk. From Hackaday ( http://hackaday.io/project/6258 ) Single chip usb temperature sensor. Description I (the Hackaday author) created this project because I wanted to learn about PIC microcontrollers and the USB protocol. I also wanted to see how simple I could make a USB device. I've gotten it down to two components: a PIC16F1455 microcontroller and the USB connector. The microcontroller acts as a USB serial device and will send the temperature as an ASCII string once per second. Details The PIC16F1455 is a relatively new microcontroller that can do USB without an external crystal. It also has internal pull-up resistors for the USB data lines. These things mean no extra hardware is necessary for USB communication. I needed something useful to send over USB and I noticed that the PIC16F1455 has a...