What you need to do to complete this lab

As before you'll need to pass the pre-lab qualifying exam before you can start the lab. The schematic for most of the transmitter and receiver circuits have already been provided in this lab. Your schematics will need to indicate how you plant to integrate these circuits together with the $\mu$Stamp11. You'll also need to provide a preliminary listing for your program. In addition to this, we'd like to you sketch the expected received signal at the output of the PN4601 module for each of the 8 integers you can send over the link. For example, if you were to send a 0x01, then you'd expect the output waveform to have exactly one pulse. Be clear in explaining the scheme you used to transform the requested integer into the transmitted bit string.

We've provided a simple kernel for this lab that uses the OC4han interrupt handler to simply increment a global counter. The kernel updates this counter (_Time) once every 256 hardware time ticks. What you'll need to do with regard to the software is

• Display the requested 3-bit integer on one of the LED displays.
• Be able to increment and decrement the requested integer using external buttons.
• Transform the 3-bit integer into a string of pulses that are then transmitted over the wireless link. We recommend that the duration of your bits be about 10 ticks of the _Time variable (i.e. use the pause command).

In order to complete this lab you will need to demonstrate your circuit. In particular we want you to hook up the output of the PN4601 module to the oscilloscope in order to graphically display the signal being received by your system.

• Demonstrate that your LED activity indicator works. If the channel is active, then the LED should be blinking quickly. If the channel is inactive then the LED should be lit but not blinking.
• Demonstrate that the received signal changes as you increment and decrement the requested button.
• Demonstrate that the requested signal you sent matches the integer you requested to be sent. Do this for each one of the 8 possible integers you can send. Compare it to your pre-lab sketches and explain any differences.