Attended: Mengyuan, Creighton, Scott

• Updates:
• To Do:

• Updates:
  • We were initially concerned about the Teensy driving the emitter using a square wave that wasn't centered at 0V, since usually we would use a signal with amplitudes [-Vpp/2, Vpp/2]. However, after comparing the received signal when driving the emitter using a square wave centered at 0 and centered at Vpp/2, we determined that it didn't matter. However, it should be noted that our results were at steady state, and we didn't observe the transient response, which might be useful.
  • We were also concerned with the current draw of the transducer. The Teensy can only safely output about 20mA of current. We weren't sure how to directly measure the current draw of the transducer, so we designed an experiment to calculate it.
    • Our results showed that at 40kHz, the transducer had an impedance of around 1.7k. Given that we are driving it with 3.3V, that puts our current draw to around 2mA, which is ten times smaller than our current limit.
• To Do:
  • Consider testing the emitter using a square wave centered at 0V and observe the transient response vs. using a square wave centered at Vpp/2.