State Machines

Beacon Detector Schematic

This beacon detector schematic uses a power regulator (not included within schematic) that takes 5 volts and outputs 3.3 voltage. This design implements a 2nd order Butterworth band pass filter along with 3 stages of gain for the amplification of the signal. The results of the beacon detector were: beacon detector detects at a range of 25+ feet. We were unable to test past 25 feet because of the size of the lab room and distance of the power supplies.

Tape Sensor Schematic

Track Wire

The Obstacles on the playing field will emit a ~26kHz signal. In order to detect them the bot will have a track wire detection sensor, that will send a signal to the Uno Stack when a signal is detected. A Tank circuit picks up the signal, and then there are three gain stages each with a gain of approximately 21 times. After this gain there is a DC value and so there is a High Pass filter with a reference voltage of 1.65V, in order to lower the DC value. Next there is a peak detector to hold the peak value of the signal, followed by a comparator. The comparator sets the output to either ground (0V) or vcc (3.3V), depending on the value of the peak detector. The values for these thresholds can be changed via the resistors. Next there is a buffer leading to an LED and also the UNO.

The schematic, perfboard layout, and a picture of the actual perfboard are below.

Check-Off 1

Using the five concepts that each of you created for the midterm, now that you are assigned to teams, come up with 2 team concepts for your design. Mix and match between the best of your individual designs. How are you and your team going to accomplish your project goals? Get some details written down in your engineering notebook.

Deliverables are:

• 2 detailed TEAM concepts for solving the project.
• Make copies of them for your teammates and yourself.

Design #1

Design #2